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nzjetboating.com Forums => Projects => Topic started by: cameronbezett on April 26, 2016, 16:35:17 PM

Title: J30a Honda repower
Post by: cameronbezett on April 26, 2016, 16:35:17 PM
Well been cruising the fourms for a wile now and finally got around to posting. I have a 4m boat with single stage colorado previously turned by a vg30 nissan v6. Went well but sucked gas and was rather heavy engine. After some issues with the ecu I'd had enough of it and sold it. Have now picked up a Honda j30a1 v6 from a 99 accord with ecu etc. Has anyone successfully run one in a boat? Have seen plenty of talk but only one boat overseas with one (fishing boat in asia somewhere, no further info). Seems a good package, light weight and rated at 200hp. Cheers
Title: Re: J30a Honda repower
Post by: Sid on April 28, 2016, 13:47:12 PM
I haven't but like yourself have been looking at the Honda V6's for a while and wondering why not..?

The J32 increased the bore size but still maintained the same crank... you can get them with the 3 into 1 integral cast headers and horsepower to the 240-250...

They are lighter than the Nissan V6s... I have seen figures of 110kgs for long blocks and should install lighter with a very simple water jacket job on a single header pipe...

I would probably use an aftermarket ecu and stay NA for a real simple install into a 3.6-3.8 hull.

Just need to put some more pressure on Clayton Scott at Southern Jet to get his 7" unit  going and could have a 350-400kg V6 running in a durable small boat....

Title: Re: J30a Honda repower
Post by: Brizz on April 28, 2016, 19:31:23 PM
+1

https://en.wikipedia.org/wiki/Honda_J_engine
Title: Re: J30a Honda repower
Post by: cameronbezett on May 04, 2016, 09:26:38 AM
Well have the engine sitting on the floor in the shop now so will be going ahead with it over the coming months. Is the earlier engine with standard manifolds. Plan is to try it out with the stock ecu and see how it goes. Have made starter mount by butchering the original bellhousing and have cut town the torque converter to use the standard ring gear as its not mounted on flex plate. Will try get some photos up later this week.
Title: Re: J30a Honda repower
Post by: glocko on May 04, 2016, 19:28:27 PM
Were'nt some of the early hondas rotation the wrong way....just thinking out loud
Title: Re: J30a Honda repower
Post by: Sid on May 04, 2016, 19:49:32 PM
yep but I think all the J series v6s are ok...
Title: Re: J30a Honda repower
Post by: cameronbezett on May 05, 2016, 14:35:55 PM
Earlier hondas do rotate anti clockwise but there are ways around that. J series and all hondas I have worked on after about 98 rotate clockwise
Title: Re: J30a Honda repower
Post by: Sid on May 05, 2016, 18:00:07 PM
yep be keen to see your progress..
Title: Re: J30a Honda repower
Post by: glenm on May 06, 2016, 08:19:41 AM
Have you weighed this engine yourself?

Just curious because wiki reckons 110kg but then I have seen someone else claim it weighs 152kg.

Cheers
Title: Re: J30a Honda repower
Post by: cameronbezett on May 12, 2016, 10:24:22 AM
No have not weighed it yet, no scales at the workshop, will do when I get a chance. Progress will be slow as i have two other projects on the go atm, hoping to have the engine sitting in the boat within the next month or so
Title: Re: J30a Honda repower
Post by: glenm on May 12, 2016, 12:03:39 PM
Beauty look forward to following it. You don't happen to know if there would be any issues marinising the later model j30A4's with the exhaust manifold cast as one piece with the cylinder head?
Title: Re: J30a Honda repower
Post by: cameronbezett on May 12, 2016, 12:41:16 PM
Have heard of it being done, would make the exhaust easier to fabricate. Things to check would be weather it runs drive by wire throttle and they typically have security key to start, easy to get around both with aftermarket ecu
Title: Re: J30a Honda repower
Post by: glenm on June 29, 2016, 11:31:39 AM
How you getting on with this project mate?
Title: Re: J30a Honda repower
Post by: Moab on June 29, 2016, 13:51:45 PM
I am thinking of putting one of these in a boat too so I am interested to hear how it goes and what it actually weighs. The jdm j30a s are pretty cheap here and they seem like they could make decent power.

Let us know.

Matt
Title: Re: J30a Honda repower
Post by: odwil on March 06, 2017, 18:55:48 PM
so has any body done anything about putting a j30 in there boat yet 
Title: Re: J30a Honda repower
Post by: cameronbezett on March 02, 2018, 13:09:25 PM
Well after breaking the daily and going overboard on fixing that am finally getting back to the boat. Have gone to an aftermarket ecu (megasquirt) after finding the factory ecu had a built in immobiliser. The guy at megasquirt in tauranga who supplied the ecu wired one into a boat 6 years ago with the same j30a1 and still had tune file, Bonus. Wiring starts this weekend and bit of fab work to get it all mounted and drive block made
Title: Re: J30a Honda repower
Post by: ojracing666 on March 21, 2018, 12:59:22 PM
Hi. How much was the megasquirt. Im thinking of buying a complete car and using the j30a with factory loom and key etc. But for the rite price an aftermarket ecu may be easyer.
Title: Re: J30a Honda repower
Post by: Brizz on March 22, 2018, 16:24:41 PM
Careful...  you'll get the Megasquirt bashers will come online to have a go at you.... cou

incidentally I run one on a Holden V6 and have for about 5 years,  only problem is the programmer(me) occasionally doing something wrong and I am along way from being an expert so explains that issue.  Easy to use and has taught me a lot.    b>
Title: Re: J30a Honda repower
Post by: Jeff B on May 11, 2018, 20:46:44 PM
This is the J35. Same size and weight as the J30 but more power.
And Mr Honda cast the exhaust manifold into the heads for nice easy exhausts.
The crank angle sensor is 60-2 moronic so easy peasy to run off aftermarket ECU (I am)
Title: Re: J30a Honda repower
Post by: Kakapo76 on May 11, 2018, 20:59:52 PM
Hey Jeff, gonna go twin snails on that thing?  *-) *-)
Title: Re: J30a Honda repower
Post by: Jeff B on May 12, 2018, 07:56:02 AM
Might just set it up NA at this stage. It is a very compact 60deg v6, single overhead Cams.
I can ditch the factory intake manifold and make some nice exhausts/balance pipe. Can get a compact package comparable to vq35/Lexus power but smaller.
Or whack a turbo on to get stock LS1 power?
Title: Re: J30a Honda repower
Post by: MRM on May 12, 2018, 10:08:30 AM
Which J35 is that one Jeff? Lots of different variants on Wikipedia.
Around 160kg?
Title: Re: J30a Honda repower
Post by: Jeff B on May 12, 2018, 10:51:54 AM
Which J35 is that one Jeff? Lots of different variants on Wikipedia.
Around 160kg?
This one is a J35z6 from 09-15 accord/Acura. Has VCM  (variable cylinder management) but that will be de-activated.
Will weigh it. It's pretty light but not light enough for me to lift it myself  *sick*
Title: Re: J30a Honda repower
Post by: Jeff B on May 13, 2018, 08:44:33 AM
Some tight   headers with "Mohawk marine" hi rise baffles make for a compact unit.
I can poke this engine in the same hole as the k24......actually it's a tad shorter.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on May 13, 2018, 09:22:37 AM
You are a machine Jeff......now tell us the weight?
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on May 13, 2018, 10:49:47 AM
nice little engine!  b>
Title: Re: J30a Honda repower
Post by: Jeff B on May 13, 2018, 16:07:32 PM
You are a machine Jeff......now tell us the weight?
Ok so we put the j35 as pictures from n the certified bathroom scales. Flywheel and headers on. No starter, alternator, intake or mounts.
118kg.
With all to run should come in at about 140kg??
Title: Re: J30a Honda repower
Post by: Jeff B on May 13, 2018, 16:10:42 PM
For comparison I put the k24 turbo on the scales. Came in at 139kg complete apart from flywheel (4.5kg and it is on the J35, same crank pattern)
So virtually same weight.
Title: Re: J30a Honda repower
Post by: Jeff B on May 13, 2018, 16:13:14 PM
Has cam caps in the back of heads. Mohawk has assessed and concluded that it's a prime carburettor/dizzy candidate..... fl.
Title: Re: J30a Honda repower
Post by: mohawk on May 13, 2018, 20:39:02 PM
It would be ideal , but finding a tidy distributor makes it abit of a mongrel.... Sure is a nice compact wee thing .
 Glad your aiming for clean and light instead of all the turbos and s##t
Title: Re: J30a Honda repower
Post by: Kakapo76 on May 13, 2018, 22:34:39 PM
if you keep it n/a can you run the factory ecu? is that hard to do?
Title: Re: J30a Honda repower
Post by: Jeff B on May 14, 2018, 10:18:18 AM
if you keep it n/a can you run the factory ecu? is that hard to do?
I'm not sure? I'm not smart enough to do that.
I know the older J30/35 can be run on the factory ECU. You can buy a modified loom/ECU out of USA, they use them in off roaders.
I'll keep this one N/A and use an aftermarket ECU
Title: Re: J30a Honda repower
Post by: Kakapo76 on May 14, 2018, 15:35:53 PM
what pump will you run... 2 stage? or your new modded 2 stage jetski pump?
Title: Re: J30a Honda repower
Post by: Spargs on May 14, 2018, 18:49:03 PM
I’m curious too about the pump you plan to use. Not knowing a lot about these engines other than what I can see online they look to develop their torque and hp at higher revs, 5k and upwards where if I understand correctly, a traditional  jet unit is losing efficiency. I’m just curious.
Title: Re: J30a Honda repower
Post by: Jeff B on May 14, 2018, 20:55:43 PM
I think it will have enough torque to spin a 7.5" 2 stage to about 5500rpm? Will see.
I think maybe a better option than a VQ35?
Not much else options for a "mid size" engine?
Will have too much low down torque and not enough revs for my 158mm 2 stage, thats going on the K24
Title: Re: J30a Honda repower
Post by: mohawk on May 14, 2018, 21:31:52 PM
Better by 2 cams and 5kg of exhaust , but otherwise physics would point towards it being exactly the same ... The datsun might be abit stronger and gruntyer , but id guess only enuf too overcome the wee bit of extra weight .
Should make a nice 12 footer on the 750 pump. B))T
Title: Re: J30a Honda repower
Post by: Jeff B on May 15, 2018, 07:51:11 AM
Actually, now that I remember it....the engine I have is the j35z6, which does not have VCM, it has v-tec on the inlet cams(not VCT) and higher compression ratio than the NZ market J35z2 which has lower compression, VCM, (not v-tec) and lower power.
So not really suited to turbo.
Title: Re: J30a Honda repower
Post by: Jeff B on May 17, 2018, 10:13:27 AM
Looking at the 752/772/kodiak/Flo pro. They are too high in the intake. Will end up with 60mm clearance under sump. Better to get the weight lower. Might have to use the trusty old Colorado (modified) intake and mount on about 3 degree angle.
Title: Re: J30a Honda repower
Post by: johnmead on May 17, 2018, 10:42:45 AM
Hey Jeff, just mount the engine lower and have the drive shaft angle down instead of up. To get enough clearance in The Old Boat, I have 10, possibly 10 and half degrees on the universals and it works fine  ;)
Title: Re: J30a Honda repower
Post by: Paul on May 17, 2018, 12:14:33 PM
Hey Jeff, just mount the engine lower and have the drive shaft angle down instead of up. To get enough clearance in The Old Boat, I have 10, possibly 10 and half degrees on the universals and it works fine  ;)

Yes, you just want the jet-bearing and flywheel totally parallel - the offset in the jet mainshaft and crankshaft can be in any direction.
Title: Re: J30a Honda repower
Post by: mohawk on May 17, 2018, 12:17:40 PM
Not if he runs a donut
Title: Re: J30a Honda repower
Post by: mohawk on May 17, 2018, 12:26:15 PM
With the motor that close you will only be able too drop it a wee bit anyway.......id move it forward , in a 12footer you may not want that much weight in the back anyway...
Title: Re: J30a Honda repower
Post by: Jeff B on May 17, 2018, 12:38:11 PM
Yes, you just want the jet-bearing and flywheel totally parallel - the offset in the jet mainshaft and crankshaft can be in any direction.

Nope.
I could mount the driveshaft "broke back" position. I could mount engine dead level with hull, driveshaft centre on a 2.5 deg angle. End yokes on 2.5 deg angle.
Still wouldn't get it much lower..
Title: Re: J30a Honda repower
Post by: Jeff B on May 17, 2018, 12:44:49 PM
Na the weight distribution is good with the engine there and fuel tanks each side front of engine.
I would rather shorten driveline by 100mm than poke the unit out the back another 100mm.
Title: Re: J30a Honda repower
Post by: Jeff B on May 18, 2018, 20:37:25 PM
.
Title: Re: J30a Honda repower
Post by: NZMikeC on May 18, 2018, 20:57:05 PM
Really like that muffler / waterbox design Jeff! Ive been concerned about condensation getting into my turbo and think that this setup post turbo would eliminate this issue. Cheers.
Title: Re: J30a Honda repower
Post by: Jeff B on May 19, 2018, 14:40:31 PM
Yeah, have done similar before on Subaru engines, seem to work well, doesn't muffle it much but helps.
Linking the 2 sides together(balance pipe) helps too.
Might just run one side over to the other and link up to run one 3' outlet? Will help sound not quite so gay? Will never be a V8 C""
Title: Re: J30a Honda repower
Post by: Jeff B on May 20, 2018, 21:03:24 PM
Mohawk had a good idea(yes that happens) to use an H bar and 772 shaft. Can set up "brokeback" with driveshaft centre down 3 deg and engine another 3 deg. This gives engine down 6 deg (unit is up 5 deg) gets engine about 40mm lower
Title: Re: J30a Honda repower
Post by: Paul on May 21, 2018, 00:05:33 AM
Good in theory, but setting the alignment will be a bit of a nightmare, as you don't have any reference planes/points.  At least with parallel-planes, it's fairly easy to measure left/right and up/down distances.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on May 21, 2018, 10:12:13 AM
5° unit angle?? How old fashioned is that! All the modern stuff is 2.8° st
Title: Re: J30a Honda repower
Post by: mohawk on May 21, 2018, 11:44:59 AM
Not that simple lazy . Engine height plays a part too , but not a difficult job.
if its out a wee bit it might just reduce service life a wee bit.
Title: Re: J30a Honda repower
Post by: Jeff B on May 21, 2018, 15:23:55 PM
5° unit angle?? How old fashioned is that! All the modern stuff is 2.8° st
Yeah?
I heard the new model was supposed to be 3 deg but tha casting was so far off that by the time it was milled flat ended up 2.8deg????
Title: Re: J30a Honda repower
Post by: Jeff B on May 22, 2018, 21:01:02 PM
Factory thermostat and inlet/outlet in a convenient spot so decided to go heat exchanger. Lightweight alloy one will sit in there nice and short hoses.
Title: Re: J30a Honda repower
Post by: Jeff B on May 26, 2018, 12:40:10 PM
Heat exchanger done. O ring end plate for stone removal.
Came out pretty light with 1.3mm wall tubes and 2mm wall housing.
With alternator and starter 10.3kg.
Title: Re: J30a Honda repower
Post by: Jeff B on May 26, 2018, 12:42:36 PM
Drive shaft (not sure if that's classed as engine weight?)
And risers
4 3kg.
Intake manifold, throttle body.
3.2kg
Title: Re: J30a Honda repower
Post by: Jeff B on May 26, 2018, 12:47:53 PM
That takes total weight so far up to 135.8kg.
Still need to add,
Engine Mounts,
Balance tube/muffler,
Fuel pump,
Hoses and crap.
I reckon I can get all that at approx 10kg??
Title: Re: J30a Honda repower
Post by: Jeff B on June 09, 2018, 15:24:22 PM
Mounts done.
2 front
1 rear.
3deg + 3deg angle.
No nightmares encountered
Title: Re: J30a Honda repower
Post by: Jeff B on June 09, 2018, 16:39:15 PM
And the most simple fan belt route ever......
Title: Re: J30a Honda repower
Post by: Jeff B on June 09, 2018, 17:15:59 PM
Alternator is a small 80 amp unit from a Mitsubishi.
Cut ugly front engine mount back and capped it (covers cam belt and water pump.
Now just to mount starter.....
Title: Re: J30a Honda repower
Post by: Allen M on June 09, 2018, 20:23:04 PM
Mounts done.
2 front
1 rear.
3deg + 3deg angle.
No nightmares encountered
Very Nice  b>
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on June 09, 2018, 21:44:58 PM
Rear engine mount will stress crack badly, plus jet boats need 2 months at the back.
Front waterpump cap thingy will leak badly.
Starter should work ok if you use ether.


 scr
Title: Re: J30a Honda repower
Post by: Jeff B on June 10, 2018, 08:41:52 AM
Nope.
The rear engine mount has been stress relieved, I gave  it a massage.
Plus it is 2 rubber Mounts, just close together for the optimum sleek design (mitzi canter shackle bushes)
The front cap, well that won't leak even if Mohawk welded it because it's just a cover to stop dust going in the cam belt, no water in there.
The pull starter I don't think I will pursue? I have one weak wrist and I would also need to mount a magneto and zenith carb to run with a flat battery.....
Will attach a Subaru starter
Title: Re: J30a Honda repower
Post by: Jeff B on June 10, 2018, 18:59:55 PM
So the Subaru starter was easier to mount than the pull starter.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on June 10, 2018, 21:15:29 PM
You are far too clever to be building jet boats  O0
Title: Re: J30a Honda repower
Post by: mohawk on June 10, 2018, 21:21:27 PM
Hmmmm , so thats where my  pump shaft , Hbar and starter ended up  >>@
Title: Re: J30a Honda repower
Post by: Jeff B on June 10, 2018, 21:36:59 PM
Yeah but I pulled the starter to bits and the contacts are pretty worn. I have ordered a new one but might Chuck some new contacts in this one as a spare.
Title: Re: J30a Honda repower
Post by: mohawk on June 10, 2018, 21:53:49 PM
The one ive got here is mint inside , you can have the front housing off that too if ya want it... i just want the motor and solenoid for landcruiser spares
Title: Re: J30a Honda repower
Post by: Jeff B on June 23, 2018, 19:56:23 PM
Decided this engine is so lightweight it that the optimum test hull is a Jeff jet 3600hd.
Title: Re: J30a Honda repower
Post by: Jeff B on June 28, 2018, 20:29:44 PM
Yep, I think I can make a 12 foot 4 seater that comes in under half a ton.....just...
Title: Re: J30a Honda repower
Post by: Markg on June 28, 2018, 21:11:18 PM
Good thing you only have skinny supermodels and mohawk as friends that will sit in those backseats anyway!!
Title: Re: J30a Honda repower
Post by: mohawk on June 28, 2018, 21:55:49 PM
jeffs back seats are only fitted for resale value .... extra people just ruin performance and stuffing motors and pumps way back is enough weight in little boats without adding a couple off fattys  :P

If it was mine id fit a bench seat and bring the cover further forward and use the space for covered storage
Title: Re: J30a Honda repower
Post by: Jeff B on June 29, 2018, 06:57:13 AM
Good thing you only have skinny supermodels and mohawk as friends that will sit in those backseats anyway!!
Mohawk never sits in the back, he is usually way out back on the end of the tow rope........ :P cou

Nobody ever really sits in the back, and I have tapered the fuel tank seats so fatty's can perch on the front.
Bench seats are for busses and boats that don't create enough cornering force to slide around...
Title: Re: J30a Honda repower
Post by: Markg on June 29, 2018, 11:26:38 AM
Dare I say it I agree with Mohawk put a bench in it, none of us know any supermodels any way
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on June 29, 2018, 13:50:07 PM
Dare I say it I agree with Mohawk put a bench in it, none of us know any supermodels any way
Have you forgotten me already?
Title: Re: J30a Honda repower
Post by: Jeff B on June 29, 2018, 14:07:20 PM
Putting a bench seat in would ruin it. Either have to step over the seat to get to the back or have a big long engine cover and waste 500mm of usable interior room? Might as well just have a 3.1m boat?
I don't see any benefit of a bench seat?? ii
Title: Re: J30a Honda repower
Post by: Markg on June 29, 2018, 18:57:03 PM
Have you forgotten me already?
Ginger size 12 ones don't count although i am sure there is a target market in the north island.
Title: Re: J30a Honda repower
Post by: mohawk on June 29, 2018, 19:53:17 PM
He said super models Lazy , not glammer models
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on June 29, 2018, 21:32:38 PM
Yep definitely more benefits in having supermodels as "friends"
Title: Re: J30a Honda repower
Post by: Allen M on June 30, 2018, 08:30:39 AM
Putting a bench seat in would ruin it. Either have to step over the seat to get to the back or have a big long engine cover and waste 500mm of usable interior room? Might as well just have a 3.1m boat?
I don't see any benefit of a bench seat?? ii
A big long engine cover is quite handy if your into proper jetboating.
Keeps the blue stuff on the right side of the boat.
Not necessary of course if your a main channel and lake boater cou
Title: Re: J30a Honda repower
Post by: Jeff B on July 07, 2018, 19:07:45 PM
Engine cover
Title: Re: J30a Honda repower
Post by: mohawk on July 07, 2018, 19:21:21 PM
Went out too inspect poduction today .. Hes made the wrong engine cover and it needs a bench seat
But
From my experience he will end up with a very lively boat with good power to weight that would rival  a small v8 (and out last any tubo 4  ;D  combinations.You still have plenty left power wise to get you into trouble.
Id still put it on a diet though.
Title: Re: J30a Honda repower
Post by: Markg on July 07, 2018, 21:07:47 PM
Went out too inspect poduction today .. Hes made the wrong engine cover and it needs a bench seat
But
From my experience he will end up with a very lively boat with good power to weight that would rival  a small v8 (and out last any tubo 4  ;D  combinations.You still have plenty left power wise to get you into trouble.
Id still put it on a diet though.
someones been drinking again
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on July 07, 2018, 22:22:34 PM
Engine cover

fancy fit out  b>
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on July 08, 2018, 08:44:49 AM
 Nice aero look.  b>
I see you even left a steam gap between the engine cover and fuel tanks.
Title: Re: J30a Honda repower
Post by: Jeff B on July 08, 2018, 09:46:34 AM
The fuel tanks still need to be mounted up on 20mm rubber mounts.
Hopefully most of the steam, smoke, noise and fumes go out the highly sophisticated exhaust system.
Engine cover  9.9kg
Left tank     6.3kg
Right tank    5.9kg
Gonna be right keeping it under half a ton..... pop
Title: Re: J30a Honda repower
Post by: Hondaz on July 08, 2018, 10:06:34 AM
Awesome build Jeff! Look forward to seeing how it goes compared to the k24 turbo and single stage. Just one question, why not a slightly longer hull, say 3.8m. Would make it easier to justify to the wife why we should buy it if it comes up for sale on trademe! Pushing the 350 and 3 stage in a 5m hull is getting old.
Title: Re: J30a Honda repower
Post by: BST on July 08, 2018, 10:51:39 AM
Jeff this is a good looking build . I’m looking to use the same engine in one of my builds what computer are you going to use ? I was hoping to use standard ecu but having trouble finding someone who can get them to run on them ! Look forward to seeing it finished
Title: Re: J30a Honda repower
Post by: Jeff B on July 08, 2018, 11:42:08 AM
Awesome build Jeff! Look forward to seeing how it goes compared to the k24 turbo and single stage. Just one question, why not a slightly longer hull, say 3.8m. Would make it easier to justify to the wife why we should buy it if it comes up for sale on trademe! Pushing the 350 and 3 stage in a 5m hull is getting old.

Yeah
This running gear is probably more suited to 3.9m hull? (Not 3.8, that's a stupid size)
But I'm trying to keep weight under 500kg,
Plus, I already have a 4m hull.  ;)
This is really a 2 person adventure boat that will carry 4 when required.
See a lot of big 5m boats on runs with only 2 people 90% of the time.
Title: Re: J30a Honda repower
Post by: Jeff B on July 08, 2018, 11:49:26 AM
Jeff this is a good looking build . I’m looking to use the same engine in one of my builds what computer are you going to use ? I was hoping to use standard ecu but having trouble finding someone who can get them to run on them ! Look forward to seeing it finished
I'll gut the factory wiring loom and start fresh, will run a Haltech ECU, these are good value second hand and more than enough features to run tho engine. I have a couple here and another running my L15 turbo.
Wiring diagrams are scarce and any info I did find on Google was wrong but this model (j36z6) runs a common motronic 60-2 CAS (same as L15)
I have found an eccentric scientist that can tune this ECU with his eyes closed with good results... 
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on July 08, 2018, 11:56:49 AM
Quote
I have found an eccentric scientist that can tune this ECU with his eyes closed with good results...   

 l-l l-l l-l
Title: Re: J30a Honda repower
Post by: Jeff B on July 08, 2018, 13:25:38 PM
Steering and reverse all hooked up.
Some of the new kids are using string but I'll stick to the reliable chain/sprocket and 3mm stainless flex wire rope, ball bearing pulleys...smooth as.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on July 08, 2018, 14:28:47 PM
How are you going to get to work on monday now your moped has no driveline? And I bet that big long reverse cable weighs a ton  cou  pop
Nice compact reverse lever tho b>
Title: Re: J30a Honda repower
Post by: BST on July 08, 2018, 14:58:35 PM
Jeff what width did your j35 come in at ? Ive got a SR20DET in a boat at the moment and hoping the 35 will fit under the same lid !
Title: Re: J30a Honda repower
Post by: Jeff B on July 08, 2018, 15:56:14 PM
Jeff what width did your j35 come in at ? Ive got a SR20DET in a boat at the moment and hoping the 35 will fit under the same lid !

Engine only is 580mm wide
With my exhausts makes it 640mm widest point.
Title: Re: J30a Honda repower
Post by: Jeff B on July 09, 2018, 20:22:58 PM
Made a new intake manifold that sits a bit lower.
Optimised for low  end, mid range and top end power....
Binned the fly by wire throttle body and for a mechanical one.
Title: Re: J30a Honda repower
Post by: Gonzo7 on July 09, 2018, 20:56:17 PM
Awesome craftsmanship as always Jeff. What size tube & shaft did you use for the steering column ? All alloy ? Or S/S shaft ?Going to replace the Teleflex in mine with chain/sprocket.
Thanks
Nick
Title: Re: J30a Honda repower
Post by: Jeff B on July 09, 2018, 21:12:13 PM
Awesome craftsmanship as always Jeff. What size tube & shaft did you use for the steering column ? All alloy ? Or S/S shaft ?Going to replace the Teleflex in mine with chain/sprocket.
Thanks
Nick

Steering column outer is 48mm OD 5mm wall scaffold pipe (hardened) skimmed down to 47mm od and Id out to 42mm each end. Shaft is 25mm Ali tube 3mm wall with solid plug end.
Uses 25x42 sealed bearings.
Title: Re: J30a Honda repower
Post by: Jeff B on July 13, 2018, 19:46:45 PM
Intake manifold was a bit bowed so machined it flat. Don't want any leaks.
Title: Re: J30a Honda repower
Post by: Jeff B on July 15, 2018, 10:59:44 AM
Counter bored the intake bolt sleeves so I could use shorter bolts (lighter and cheaper)
Hard work trying to keep weight down to 100kg less than Lazy's....
Fitted throttle cable to mechanical throttle body.
Title: Re: J30a Honda repower
Post by: Jeff B on July 15, 2018, 19:45:18 PM
Fuel tanks rubber mounted. I let Mohawk weld that bit  on...
Fuel filler and breather fitted. Straight shot into the tank, I hate fuel tanks that I can't fill at full noise.
Also fitted bilge outlets, in the left so I can see them.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on July 15, 2018, 20:33:23 PM
2 fuel fillers or are you using a balance pipe?
Title: Re: J30a Honda repower
Post by: Jeff B on July 16, 2018, 06:48:38 AM
1" balance pipe and 3/8" breather linking the 2 tanks.
works as one tank.
Title: Re: J30a Honda repower
Post by: Markg on July 16, 2018, 07:41:01 AM
A front bench seat would solve all this  needless balance hoses.Lighter faster st
Title: Re: J30a Honda repower
Post by: Jeff B on July 16, 2018, 10:19:08 AM
A front bench seat would solve all this  needless balance hoses.Lighter faster st
I can't, if I move the weight forward it will cost me speed. I don't have a trim nozzle on this one and Ross is threatening to achieve a higher top speed with a wheezy 4 cylinder.
Plus the fuel tanks are safe here, I don't have to worry about puncturing them with a stray rod..... :P st
Title: Re: J30a Honda repower
Post by: Markg on July 16, 2018, 12:24:09 PM
 The standard Honda conrods  don’t travel very far on the outside of the engine block your fuel tanks are safe as, !!!!
Title: Re: J30a Honda repower
Post by: mohawk on July 16, 2018, 14:02:44 PM
They will if lazy trys too go faster.
Title: Re: J30a Honda repower
Post by: Jeff B on July 16, 2018, 14:31:05 PM
They will if lazy trys too go faster.

We have done the calculations and for Lazy to make the same HP he needs 9psi boost
To go the same speed he needs 11psi boost (heavy tub)
To keep up with me.......12psi (I'm a better driver) :P :P st
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on July 16, 2018, 20:29:33 PM
14 psi here I go B))T B))T B))T
Title: Re: J30a Honda repower
Post by: Jeff B on July 16, 2018, 20:40:25 PM
Fit dash as a separate panel, heaps easier to wire up.
Not many gauges but nice big idiot lights......for big idiot driver....
Title: Re: J30a Honda repower
Post by: Markg on July 16, 2018, 23:21:51 PM
14 psi here I go B))T B))T B))T
Live a little 17psi is a much better number
Title: Re: J30a Honda repower
Post by: mohawk on July 17, 2018, 10:16:41 AM
Its a family boat mark....i would keep the kids in the front seat at 17psi. fl.
Title: Re: J30a Honda repower
Post by: Jeff B on July 25, 2018, 21:18:05 PM
This is the attempt to drown out the terrible v6 sound......who knows, it might make it sound like a v8? pig

Used 2mm Ali so pretty light. 2.6 kg
Fits in nicely leaving room for battery.
Title: Re: J30a Honda repower
Post by: mohawk on July 25, 2018, 21:52:27 PM
Might crack ?? We've seen that sort of thing happen before....
Nice experiment though but my muffler is better. )1 )1 )1 )1
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on July 25, 2018, 22:28:04 PM
I thought exhaust filters were only for jet ski's ii
Title: Re: J30a Honda repower
Post by: Jeff B on July 26, 2018, 06:47:01 AM
I thought exhaust filters were only for jet ski's ii

Nope. All new v6 powered boats are required to make an effort to reduce noise pollution.
This is, after all a sociable type boat, not aimed at hooligan types.
Mohawk, if you look closely you will notice the end caps are domed so no flat panels to cause cracking.... ::)
Title: Re: J30a Honda repower
Post by: Jeff B on July 26, 2018, 06:50:10 AM
Made some fittings for heat exchanger. Using an12 hose which is about 18mm ID
Title: Re: J30a Honda repower
Post by: Jeff B on July 29, 2018, 07:20:23 AM
12 footer with a decent sized engine/unit is still a pig to push so hull has the mandatory sloppy plastic installed.
Pushed and pulled and beat it into place.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on July 29, 2018, 09:57:52 AM
Looks very smic and smooth..... too smooth and will cause stiction and drastically reduce top speed  st
One more difference between you and me....... when I "push, pull and beat" something I don't have to tell anyone! They can clearly see that for themselves C""
Title: Re: J30a Honda repower
Post by: Jeff B on July 29, 2018, 13:43:42 PM
The natural finish of this high grade virgin UHMPHE was a bit rough so we milled the whole surface to make ultra smooth....good for 0.6 km/hour
Title: Re: J30a Honda repower
Post by: Jeff B on July 31, 2018, 10:24:28 AM
Plastic all bolted in.
Raised hull temperature 10 degrees which made plastic expand 6mm. Bolted down mint.
Total 52 bolts.
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on July 31, 2018, 15:39:46 PM
Looks great
How durable is the alloy trim around the intake?
Title: Re: J30a Honda repower
Post by: Jeff B on July 31, 2018, 15:41:23 PM
Looks great
How durable is the alloy trim around the intake?
It's very durable because it's 4mm thick stainless  ;)
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on July 31, 2018, 16:23:42 PM
It's very durable because it's 4mm thick stainless  ;)
Cool👍
Title: Re: J30a Honda repower
Post by: Markg on July 31, 2018, 17:22:30 PM
Do you have any trouble getting to the lathe or the drop saw!!!
Title: Re: J30a Honda repower
Post by: Jeff B on August 01, 2018, 06:48:30 AM
Do you have any trouble getting to the lathe or the drop saw!!!

Yes!
But I have a system where every 5 boats I have a minor tidy up. b>
Or when the mess starts affecting productivity.
Title: Re: J30a Honda repower
Post by: JohnR on August 01, 2018, 15:43:48 PM
Hey jeff,  ur grill needs more bars on the right side. May let a few rocks in the way it is. Other than that shes looking great
Title: Re: J30a Honda repower
Post by: mohawk on August 01, 2018, 20:22:35 PM
How much higher (or lower in the photo ) could you lift those bars at the front ?
Title: Re: J30a Honda repower
Post by: Jeff B on August 02, 2018, 07:53:35 AM
How much higher (or lower in the photo ) could you lift those bars at the front ?

3mm
But that's only really to allow for some plastic wear.
Title: Re: J30a Honda repower
Post by: Jeff B on August 04, 2018, 13:14:56 PM
The battery tucks in between bearers and unit.
Title: Re: J30a Honda repower
Post by: JohnR on August 04, 2018, 16:00:51 PM
Engine looks well outta ahlinment
Title: Re: J30a Honda repower
Post by: Jeff B on August 04, 2018, 16:35:33 PM
Looks ok to me?
3deg + 3deg brokeback
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on August 04, 2018, 20:04:18 PM
Looks ok to me?
3deg + 3deg brokeback
thats vertical plane b> what about the horizontal plane.? also equal angular velocities?
Title: Re: J30a Honda repower
Post by: Jeff B on August 04, 2018, 21:47:13 PM
thats vertical plane b> what about the horizontal plane.? also equal angular velocities?

Yep equal 3deg equal to 3deg
Engine sits at 6degrees difference to unit shaft.
The engine shaft and unit shaft do not have to be in the same parallel plane. But the uni angles must be the same.
Am I missing something?? ii
Title: Re: J30a Honda repower
Post by: JohnR on August 05, 2018, 09:27:52 AM
Pretty sure crank and unit shaft should be parallel. Not broke back or whatever that means sounds dodgie. Ive always lined myne up so its parallel with shaft and raised or lowered all engine mounts arround 5mm so you can se some obvious offset. I think this time jeff i can say your wrong. Drive shafts are made for raising and lowereing things. Not going round corners.
Title: Re: J30a Honda repower
Post by: mohawk on August 05, 2018, 09:43:36 AM
wrong john
Title: Re: J30a Honda repower
Post by: JohnR on August 05, 2018, 09:49:19 AM
So is their more than one correct way to set up a hbar? 
Title: Re: J30a Honda repower
Post by: mohawk on August 05, 2018, 10:22:58 AM
The diagram in post 132 explains the way jeff has done it john... its also in the hamilton instalation manuals.
The biggest problem with drive shafts is the amount of people / mechanics who DONT know whats correct.

I had a uni replaced by the shop on the 75 and did the whole south island trip with the drive shaft 30deg out of phase . Couldnt use my rear view mirror for 5000 km because of the vibration but i spotted it and fixed it and now i can see behind me....lots of cars out there the same going just fine , but the parts wear alot quicker.
Title: Re: J30a Honda repower
Post by: Jeff B on August 05, 2018, 10:31:24 AM
So is their more than one correct way to set up a hbar?

Yes.
An H bar is the same as any other driveshaft, just shorter.
If you go from one end in my setup.
The angle from unit shaft to driveshaft centre is 3 deg. (Recommended 3-8)
Then the angle from driveshaft centre to engine crank is 3 deg as well.
This is the bit you are confused about. It can be up 3 deg or down 3 deg. It's the same effect.
If I went back up 3 deg (like most do) my engine would be on the same parallel angle as the unit shaft which is 5 degrees up from hull bottom.(std unit angle for hamilton/Flo pro)
If I did That, my engine would sit up high and on a 5 deg up angle.
I have gone down 3+3=6deg to get 20mm sump clearance (lower centre of gravity) and my engine sits at a better angle (1 deg down) as it's a front sump engine so less chance of oil starvation when accelerating.
Title: Re: J30a Honda repower
Post by: Jeff B on August 05, 2018, 10:34:13 AM
So is their more than one correct way to set up a hbar?

I heard a rumour that the last time alexcraft lent out their driveshaft alignment tool it came back bent?..... pop
Title: Re: J30a Honda repower
Post by: JohnR on August 05, 2018, 10:39:23 AM
Sounds like a markg story.  cou Yea i think they lend their bent one out. Haha. Im sure the one i borrowed was bent, so i made my own
Title: Re: J30a Honda repower
Post by: JohnR on August 05, 2018, 11:05:45 AM
So is it better on the joints with 3 degrees off parallel shafts or is optiomum better with shaft and crank parallel. Thats what i whanna know
Title: Re: J30a Honda repower
Post by: Paul on August 05, 2018, 11:33:07 AM
So is it better on the joints with 3 degrees off parallel shafts or is optiomum better with shaft and crank parallel. Thats what i whanna know

It doesn't matter John, as long as angles are equal. The setup/ alignment this way is more difficult to do (- far easier to check for parallel faces), but this method allows you to sit engine flatter etc, instead of at jetshaft angle.
Title: Re: J30a Honda repower
Post by: JohnR on August 05, 2018, 13:22:25 PM
Sweet. Thanks. I take it back jeff. Ur right. Nice build btw
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on August 05, 2018, 19:02:20 PM
Yep equal 3deg equal to 3deg
Engine sits at 6degrees difference to unit shaft.
The engine shaft and unit shaft do not have to be in the same parallel plane. But the uni angles must be the same.
Am I missing something?? ii
yes thats right... you are referring to vertical/height angle b>
but the horizontal/side to side alignment often ignored also should have same angular velocity.

in commercial applications many use jeffs arrangement for the same reasons.. due to high hours expected some specify equal angular velocities of 2 deg with tolerance +- 0.2 deg, ive seen as much as 5 deg
Title: Re: J30a Honda repower
Post by: Jeff B on August 06, 2018, 07:37:39 AM
Side/side there is no offset.
The unit is centre and the engine is centre......wouldnt build a boat where these 2 things are not dead centre?
Title: Re: J30a Honda repower
Post by: Jeff B on August 06, 2018, 07:38:51 AM
Fuel rail mods to take an hose and return
Title: Re: J30a Honda repower
Post by: Jeff B on August 06, 2018, 07:41:00 AM
Screwed the regulator straight to the tank. Saves a fitting and a bracket. I normally screw it straight to the fuel rail but there is not much room there.
Title: Re: J30a Honda repower
Post by: Kakapo76 on August 06, 2018, 09:43:42 AM
looking really nice Jeff, I think I would go your reg on the tank idea next time as well- less mess if there is a leak and keeps the reg away from the headers or intake manifold.

I have to replace my alternator as its throwing out 15 plus volts at WOT do you have a recommendation for a nice small unit?
Title: Re: J30a Honda repower
Post by: Jeff B on August 06, 2018, 11:27:39 AM
With the regulator on the tank there is slightly more high pressure fuel hose, that's all. But no return hose, as that's where it's screwed to the tank.
The little Denso alternator are pretty light, common and reliable.
I have used a few. Often have to swap out the V pulley for a multi rub one.
The alternator I have for this engine is a little Mitsubishi 80amp one.
Depends on your mounting setup really?
Title: Re: J30a Honda repower
Post by: Jeff B on August 06, 2018, 20:15:47 PM
Started on the wiring.
Will be pretty simple this one, only a switch point for V Tec. Don't even need the can angle sensor. Will set up wasted spark.
This is the pile of wires that I don't need.
Title: Re: J30a Honda repower
Post by: Markg on August 06, 2018, 20:30:19 PM
Factory ecu?
Title: Re: J30a Honda repower
Post by: Jeff B on August 06, 2018, 20:53:11 PM
Factory ecu?
Na
Haltech ECU
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on August 06, 2018, 22:11:34 PM
Sing out if you need a hand. I've got a few of these left over from mine which I'm happy to donate.
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on August 06, 2018, 22:55:42 PM
Side/side there is no offset.
The unit is centre and the engine is centre......wouldnt build a boat where these 2 things are not dead centre?
still need to keep angular velocities the same within spec, even if they are zero, often overlooked, often broken uni's much of which pics are posted here lol

some twin engines do offset on longer drive shafts to allow some more room
Title: Re: J30a Honda repower
Post by: Allen M on August 07, 2018, 07:51:27 AM
Side/side there is no offset.
The unit is centre and the engine is centre......wouldnt build a boat where these 2 things are not dead centre?
I've seen a known brand name boat with the jet unit 12mm off centre  pop
Title: Re: J30a Honda repower
Post by: Jeff B on August 07, 2018, 08:54:00 AM
Sing out if you need a hand. I've got a few of these left over from mine which I'm happy to donate.

Thanks Lazy.
That would be handy for joining my throttle cable together too....
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on August 07, 2018, 10:50:36 AM
I've seen a known brand name boat with the jet unit 12mm off centre  pop
That's just fine so long as angular velocities are equal and of course there is a reason to have an horizontal offset in a jet boat!
Title: Re: J30a Honda repower
Post by: Jeff B on August 08, 2018, 18:12:29 PM
Making nice Ali trailer for the honda boat.
Title: Re: J30a Honda repower
Post by: Markg on August 08, 2018, 18:52:37 PM
At this rate it should be in the water for tuning on sunday!!
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on August 08, 2018, 23:08:53 PM
Nice trailer
Title: Re: J30a Honda repower
Post by: Jeff B on August 11, 2018, 09:04:34 AM
At this rate it should be in the water for tuning on sunday!!

I am on a bet with Lazy (Ross) to see who is on the water first.........and of course who is going the longest.... fl.
Title: Re: J30a Honda repower
Post by: Markg on August 11, 2018, 20:14:28 PM
Should be a easy bet to win as you are not burning time trying to make a exhaust that looks like a snake round a drainpipe scr
Title: Re: J30a Honda repower
Post by: Jeff B on August 13, 2018, 09:50:41 AM
Finished off the wiring
Made up some battery leads, nice and short.
Everything seems to work and no smoke came out from anywhere so must be ok?
Dash idiot lights are pretty bright, will need them to tell if engine is running since it will be so smooth and quiet......
Title: Re: J30a Honda repower
Post by: Paul on August 14, 2018, 18:33:44 PM
Did you steal the clearance lights off my trailer?  They look identical...
;)
Title: Re: J30a Honda repower
Post by: Jeff B on August 14, 2018, 19:00:23 PM
Did you steal the clearance lights off my trailer?  They look identical...
;)

Yep they are LED trailer clearance lights.
Red= oil pressure = stop now
Amber= over temperature = stop in the next deep pool.
Title: Re: J30a Honda repower
Post by: Jeff B on August 17, 2018, 06:47:23 AM
Made a fuel pickup screen that screws into sump of tank. Hooked up fuel pump.
Title: Re: J30a Honda repower
Post by: Jeff B on August 17, 2018, 06:49:34 AM
Fuel tank balance pipe was a bit too close to sump and I didn't want it to run so I made a stainless one.
Also got some new impellers from Flo Pro.
Title: Re: J30a Honda repower
Post by: Jeff B on August 17, 2018, 18:26:42 PM
Filled engine with oil (4 litres) and coolant (4.3 litres)  no leaks......yet.
Pulled a plug out and found TDC to figure out missing tooth offset (about 70 deg)
Almost ready to fire up... fl.
Title: Re: J30a Honda repower
Post by: Jeff B on August 17, 2018, 18:29:49 PM
My mechanic/engine builder looked at the firing order and concluded it was either wrong or stupid engineering by Mr Honda......what would they know?....
Title: Re: J30a Honda repower
Post by: Paul on August 17, 2018, 20:24:56 PM
The Chev V6s (until approx millenium - I don't know about new ones), all used to fire each cylinder along the crank in sequence starting at flywheel end (- so 654321 in Chev speak). Firing along the crank is the same as the diagram above, but starting from other end. It's a bit weird that Honda (and Ford) number each cylinder on one side of block, then number the cylinders on the other side of the block??

The Commodore 3800 also follows the Chev 654321 sequence/numbering, and ripples along the crank in sequence.
Title: Re: J30a Honda repower
Post by: Paul on August 17, 2018, 20:43:56 PM
For wasted spark to work, you need to pair cylinders that are furthest apart in firing order (e.g. the three drawn in pen lines on the diagram - NOT the three pairings suggested in the words on the diagram!). So, 1-5 2-6 3-4.
Title: Re: J30a Honda repower
Post by: Jeff B on August 19, 2018, 09:16:59 AM
So it runs....sort of
Had some issues with firing order because I wired up ignition channels 2&3 back to front.. l-l

Was blowing more exhaust out the intake manifold to start with.
MAP sensor is way off, using factory honda one which seems oddball?
Might buff it and use a GM one.https://youtu.be/mTZ2L9AwaMk

Title: Re: J30a Honda repower
Post by: Jeff B on August 22, 2018, 12:05:16 PM
Engine is pretty quiet now that the oil has pumped up the lifters. Exhaust seems to work well

https://youtu.be/8yyy_FgOn-Q
Title: Re: J30a Honda repower
Post by: Jeff B on August 22, 2018, 12:08:25 PM
My oil light wouldn't go out, tested and light is fine .
Got a bit paranoid and screwed a gauge in (cheap fuel pressure gauge) (didn't cause any fires)
And pressure is good at 3.5bar at idle.
Turns out my sender is bad, that's all.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on August 22, 2018, 18:38:20 PM
Do you hold ya finger over the microphone why filming to make it seem quieter?
Title: Re: J30a Honda repower
Post by: Jeff B on August 22, 2018, 19:02:28 PM
Do you hold ya finger over the microphone why filming to make it seem quieter?
Na I am definitely not coordinated enough to do that.
It's just a nice quiet engine with an engineered muffler system.
I'm sure the unit will make heaps of no use to make up for it??
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on August 23, 2018, 00:16:35 AM
My oil light wouldn't go out, tested and light is fine .
Got a bit paranoid and screwed a gauge in (cheap fuel pressure gauge) (didn't cause any fires)
And pressure is good at 3.5bar at idle.
Turns out my sender is bad, that's all.
chinese sender?
Title: Re: J30a Honda repower
Post by: Jeff B on August 23, 2018, 06:41:59 AM
chinese sender?
Na
Is the factory Honda sender.
Title: Re: J30a Honda repower
Post by: Jeff B on August 23, 2018, 14:45:45 PM
what size nozzle you guys running on 2 stage? Lexus? VQ35?
Mine is currently 97.7mm. Might try that first but it doesn't have an insert....Might have to make some.
Title: Re: J30a Honda repower
Post by: Jeff B on August 30, 2018, 18:31:34 PM
Unit is all assembled and working.
Installed pop up clear  (for towing) for when boating with Mohawk
Title: Re: J30a Honda repower
Post by: JohnR on August 30, 2018, 20:23:59 PM
what size nozzle you guys running on 2 stage? Lexus? VQ35?
Mine is currently 97.7mm. Might try that first but it doesn't have an insert....Might have to make some.

The best i found with flo pro 19 and southern jet 18 3 bladers was 99mm
Title: Re: J30a Honda repower
Post by: Jeff B on September 01, 2018, 20:56:23 PM
Decided it was not worth chopping and changing the oil filter housing so will need to angle out the front panel.
Title: Re: J30a Honda repower
Post by: Jeff B on September 04, 2018, 21:53:21 PM
Filled in front of engine cover.
Decided to put a decent latch on it to stop it blowing open when the engine explodes.....
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on September 04, 2018, 22:10:51 PM
That poxy little Chinese latch won't be much use when the rods decide to go on vacation... --<
Title: Re: J30a Honda repower
Post by: mohawk on September 04, 2018, 22:18:00 PM
You could hold it down with a spare wheel  b>
Title: Re: J30a Honda repower
Post by: Jeff B on September 04, 2018, 22:27:23 PM
Fitted the throttle pedal too.
Should only need about 60% throttle to be faster than Lazy....
Title: Re: J30a Honda repower
Post by: Paul on September 04, 2018, 23:28:17 PM
You could hold it down with a spare wheel  b>

Good upgrade for you there Shane!  ;D
Title: Re: J30a Honda repower
Post by: Jeff B on September 05, 2018, 07:19:44 AM
Actually now I see my engine cover is very similar to the landy bonnet? I didn't mean to do that but am kicking myself now....im a sicko.....
If I wasn't so lazy I would chop it up and start again....
Title: Re: J30a Honda repower
Post by: mohawk on September 05, 2018, 08:16:58 AM
Alan M and paul think it looks cool jeff. O0
Title: Re: J30a Honda repower
Post by: Jeff B on September 06, 2018, 12:26:30 PM
Plugged in the lap top and made a few tweaks....
Turned off the MAP limit
Got the tacho working.
Seems to start and run pretty sweet.
Ready for water test.
Title: Re: J30a Honda repower
Post by: Kakapo76 on September 06, 2018, 15:15:14 PM
Good job Jeff! If its not too much to ask can we have a slightly longer video than your usual 15 second efforts?  b> Looking forward to seeing this baby boogie! B))T
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on September 06, 2018, 18:51:13 PM
It's running a Honda engine.... just be happy with 15 seconds at a time  scr
Title: Re: J30a Honda repower
Post by: Jeff B on September 06, 2018, 20:13:23 PM
So I stuffed around for about an hour trying to calibrate the honda MAP sensor, managed to confuse myself too much so chucked the honda sensor and hooked up the GM MAP sensor.....took half an hour and it works mint  b>
Run it up on hose for half an hour and checked faucet etc...all good.
Dash temp gauge reads about 5 deg less than ecu. 85 vs 90.
Managed to fiddle with the tune a bit and judging by the black soot coming out the back I've got the mixture about as good as Mohawks carbs .....
I need Karl to work his magic now
Title: Re: J30a Honda repower
Post by: Allen M on September 07, 2018, 08:25:12 AM
So I stuffed around for about an hour trying to calibrate the honda MAP sensor, managed to confuse myself too much so chucked the honda sensor and hooked up the GM MAP sensor.....took half an hour and it works mint  b>
Run it up on hose for half an hour and checked faucet etc...all good.
Dash temp gauge reads about 5 deg less than ecu. 85 vs 90.
Managed to fiddle with the tune a bit and judging by the black soot coming out the back I've got the mixture about as good as Mohawks carbs .....
I need Karl to work his magic now
Black soot is good. It'll help you avoid Ross's misfortune. B))T
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on September 07, 2018, 10:20:41 AM
Hey I had soot too..... but got board with it so turned on the steam, oil and metal particle function. I don't think Jeff's putty old v6 even has a switch for that function, plain pack model.
Title: Re: J30a Honda repower
Post by: Jeff B on September 08, 2018, 18:25:23 PM
Goes hard nuts b>

https://youtu.be/GFtjzUl08vI
Title: Re: J30a Honda repower
Post by: Jeff B on September 08, 2018, 19:24:11 PM
My writing is pretty messy but...rpm/speed in the lake. One up. 35 litres of fuel.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on September 08, 2018, 20:42:15 PM
Top effort Jeff.
Title: Re: J30a Honda repower
Post by: Kakapo76 on September 08, 2018, 21:34:32 PM
Sounds great- looks like its going hard!!!! well done mate... and over 30 secs of video *-)
Title: Re: J30a Honda repower
Post by: Jeff B on September 08, 2018, 21:40:02 PM
It is actually pretty quiet. Very impressed, the unit hooks up well. Hull handles good, could probably do with a bit of up trim, currently down 5 deg. Might make a wedge?
I might fiddle a bit more to get the magic 90 before Lazy.....
Title: Re: J30a Honda repower
Post by: mohawk on September 08, 2018, 21:53:46 PM
Your piece of paper shows returns diminishing after 3000rpm ... That should be the other way round  ???,
  It would be a sign its starting too drop its nose soon after planing , and it did spring up out of the water quite nicely.... should be just on the verge of porpice flat out  B))T
Title: Re: J30a Honda repower
Post by: Paul on September 09, 2018, 10:40:50 AM
The science geek in me couldn't resist.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on September 09, 2018, 17:01:10 PM
The science geek in me couldn't resist.

Thank you for pointing that out Paul. Jeff has clearly misrepresented the maximum speed ....... most likely in the hope it will dishearten me and I will sell my boat as parts (broken oily parts) and he won't have to suffer the shame of the mighty K24 burning past him.  st
Title: Re: J30a Honda repower
Post by: Jeff B on September 09, 2018, 17:14:35 PM
Thank you for pointing that out Paul. Jeff has clearly misrepresented the maximum speed ....... most likely in the hope it will dishearten me and I will sell my boat as parts (broken oily parts) and he won't have to suffer the shame of the mighty K24 burning past him.  st

actually, the top speed was a constant 85
the inaccurate one was 4500rpm, i think that was a bit faster but hard to hold it at that rpm as lake was a bit choppy.

looking at other setups i could probably go larger in the nozzle  with the 4 blader in the back but i don't want to loose the nice midrange shove it currently has.

i will make a wedge up and set the nozzle at 0-1 deg as it's currently down -5 and not a hint of porposing.

according to my data, Lazy will need 18.5psi to have a hope at matching my cruise/high speed but i will smoke him hands down on holeshot....
Title: Re: J30a Honda repower
Post by: mohawk on September 09, 2018, 17:33:31 PM
I would guess there is 3 too 5 kmph left but there is alot of weight stuffed in the back of that boat
 The surface of that lake was about as good as it gets for a speed run too  b>
Title: Re: J30a Honda repower
Post by: Jeff B on September 09, 2018, 17:54:07 PM
I would guess there is 3 too 5 kmph left but there is alot of weight stuffed in the back of that boat
 The surface of that lake was about as good as it gets for a speed run too  b>


I only need another 4.2km/hr to crack the magical 90 barrier (to make Lazy cry)

I will weigh it at the scrappy this week.....might even find some good stuff while im there...
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on September 09, 2018, 18:06:45 PM
Quote

I will weigh it at the scrappy this week.....might even find some good stuff while im there...
Keep ya eye peeled for a blown up 4 cylinder Honda as I only need 1 more rod to make a set
Title: Re: J30a Honda repower
Post by: mohawk on September 09, 2018, 18:30:05 PM
Keep ya eye peeled for a blown up 4 cylinder Honda as I only need 1 more rod to make a set
PM Mark  b>
Title: Re: J30a Honda repower
Post by: Markg on September 09, 2018, 19:53:38 PM
Mine went to a different scrappy months ago.Even threw the standard rods away from the one that got forged.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on September 09, 2018, 20:43:43 PM
If they're that hard to get hold of, Mohawk might have to make me one! The stock ones are made out of plasticine so shouldn't be hard to copy....
Title: Re: J30a Honda repower
Post by: mohawk on September 09, 2018, 22:31:20 PM
If they're that hard to get hold of, Mohawk might have to make me one! The stock ones are made out of plasticine so shouldn't be hard to copy....
I shall practice welding plasticine tomorow and whip a couple up for ya as soon as i get good at it .....  How hard can it be  ii
Title: Re: J30a Honda repower
Post by: Jeff B on September 12, 2018, 20:08:26 PM
Engine having trouble starting sometimes, ecu is having trouble recognizing the 2x missing teeth while cranking.  So im hooking up the can angle sensor. Had to pull the can pulley off to modify it to one tooth home signal so gave it a birthday.
New cambelt, tensioners, idlers, water pump, checked the tablets too (yes they are manual adjusted)
Found this bit.....im pretty sure it goes in Lazy's Engine?
... :P
Title: Re: J30a Honda repower
Post by: Paul on September 12, 2018, 20:39:19 PM

Found this bit.....im pretty sure it goes in Lazy's Engine?
Naah, the pin has already been pulled in Ross' install.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on September 12, 2018, 21:35:28 PM
Pull the pin Jeff.... go on.
Title: Re: J30a Honda repower
Post by: Jeff B on September 15, 2018, 19:22:17 PM
https://youtu.be/pAWoYtt_ajs
Title: Re: J30a Honda repower
Post by: Jeff B on September 15, 2018, 20:04:47 PM
Bored nozzle out to 101mm
2.5 deg wedge in nozzle (still down 2.5)
Pops up just as quick and still plane along happily @ 2500rpm, 30ks
WOT up slightly to 4850-4900rpm.
Still not starting properly sometimes and I think my muffler is filling up with water, after about 5 seconds full throttle it starts to choke and I loose rpm.
Will cut water back or pull out mesh baffle.
Speed up to 88km/hr
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on September 15, 2018, 20:26:28 PM
Jumps out very nicely. Even if is a bit hard to start you'll still get to the corner first.
Title: Re: J30a Honda repower
Post by: Jeff B on September 16, 2018, 07:05:03 AM
Flo pro (impellers) are advising 108-110mm nozzle for this setup (VQ35, Lexus) I'm pretty happy with performance/cruise now and the nozzle is getting quite thin so can't go that big.
I'm thinking taking the nozzle out to that size might bring the cruise/WOT rpm up but not give me any more thrust/speed? I don't see the point in revving it to 5500 and cruising at 3000 if I can do everything 500odd rpm lower?
I feel the trim is pretty much spot on now, sits up nicely with no porpoising.

will pull the muffler baffle mesh out and do a final tune.....only 2 more ks until I'm out of reach for Lazy..... fl.
Title: Re: J30a Honda repower
Post by: mohawk on September 16, 2018, 07:50:56 AM
The trim was real nice and the boat sat nice and high in the water .. Its only the fiddly , complicated and extreamly unreliable EFI that lets it down ... It was a terrible place too accuratly test speed , but if lazy never tests there you should be safe for a while  b>

Why did you edit the best bits out of the video ?
Title: Re: J30a Honda repower
Post by: JohnR on September 16, 2018, 13:30:51 PM
Thats too big. Myne slipped over 104. Found 99was best all round
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on September 16, 2018, 16:23:31 PM
Quote
It was a terrible place too accuratly test speed , but if lazy never tests there you should be safe for a while  b>
Kaituna falls is Jeff's new speed testing grounds....
Title: Re: J30a Honda repower
Post by: Jeff B on October 23, 2018, 20:09:05 PM
What causes spark plugs to go like this?? ii
Title: Re: J30a Honda repower
Post by: mohawk on October 23, 2018, 20:24:04 PM
What causes spark plugs to go like this?? ii
Worn muffler bearings  ???
Title: Re: J30a Honda repower
Post by: Paul on October 23, 2018, 20:37:33 PM
They all look pretty hot. Try 1/2 heats cooler.
Are they the iridium ones?
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on October 23, 2018, 20:49:48 PM
Lack of boost can cause that
Title: Re: J30a Honda repower
Post by: Warwick Marflitt on October 23, 2018, 21:55:04 PM
What causes spark plugs to go like this?? ii
Preignition.
http://easternbigtwin.com.au/index.php/2016/05/16/spark-plugs/failed-spark-plugs/
Title: Re: J30a Honda repower
Post by: Markg on October 23, 2018, 22:02:09 PM
A good honda motor only needs four plugs ()()
Title: Re: J30a Honda repower
Post by: Jeff B on October 24, 2018, 07:19:41 AM
A good honda motor only needs four plugs ()()

Yeah tell me about it.... 00-
This is supposed to be the reliable, low maintenance setup...
My little turbo honda gets thrashed and it still has the plugs that came with the engine (gapped down a bit)

I suspect I have ignition issues...
Title: Re: J30a Honda repower
Post by: Warwick Marflitt on October 25, 2018, 13:12:15 PM
Nice video showing and explaining different causes of Knocking and pre ignition

https://www.youtube.com/watch?v=4ZysyokEU60
Title: Re: J30a Honda repower
Post by: Jeff B on December 12, 2018, 11:10:22 AM
https://youtu.be/ypYVym4GzwU

Here ya go Mark.. .
Title: Re: J30a Honda repower
Post by: Jeff B on December 12, 2018, 11:16:06 AM
So I pulled the front pulley off and my honda had installed a trigger wheel on the crank cam pulley, no trigger sensor? Must be a leftover from the j30/32 or something?
My j35 factory crank trigger (60-2) is part of the crank beside cyl 5&6. Not keen to pull the sump and try modify it I modified the front one to 12 tooth even and I fitted a trigger pickup. One trigger on the camshaft.
The ecu now thinks it's running a 2jz Toyota.. ..
But it works and I didn't have to fit any external trigger wheels.
Title: Re: J30a Honda repower
Post by: Markg on December 12, 2018, 18:08:35 PM
https://youtu.be/ypYVym4GzwU

Here ya go Mark.. .
Missing twin turbos but its a start st
Title: Re: J30a Honda repower
Post by: Jeff B on December 17, 2018, 20:28:25 PM
All back together and wiring tidied up. Took for a run and all good. I pulled a couple degrees timing (just to be safe)
Starts and runs good. Quite impressive thrust and still a light/small boat to Chuck around.
87km/hour @4900rpm.
Planes happy at 33km/hour @ 2500rpm.
Nice cruise 49km/hour @ 3000rpm.
Could probably go bigger again on nozzle but I'm pretty happy with performance as it is.
Can't make it slip.
Title: Re: J30a Honda repower
Post by: Jeff B on December 22, 2018, 08:29:06 AM
Weigh day.
On target.
Title: Re: J30a Honda repower
Post by: Allen M on December 22, 2018, 09:02:44 AM
Weigh day.
On target.
Excellent result. b>
Should be a great mid size boat  B))T
Title: Re: J30a Honda repower
Post by: Jeff B on December 22, 2018, 18:07:55 PM
Fitted a better unit air bleed, 1/2" hose and valve by reverse lever. Works good and takes 75% of unit noise away. Unit still won't slip even with fully open.
Hull/boat feels nice and light on the water, still has the little boat feel. Very happy.
Should last twice as long as the turbo 4 cylinder and about 8x longer than ski engine/pump setup... st
Title: Re: J30a Honda repower
Post by: mohawk on December 22, 2018, 18:18:36 PM
At last a 12 foot boat with the right size engine and pump.. b>
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on December 23, 2018, 08:20:21 AM
So what did the scrappy give you?
$1.70 per kg hhh
Title: Re: J30a Honda repower
Post by: Hondaz on December 24, 2018, 09:05:59 AM
Great work as always Jeff. Another 200-300mm on the hull length and it would make a great all rounder. But for it's designed purpose I think you have mailed it.  B))T
Title: Re: J30a Honda repower
Post by: Jeff B on December 24, 2018, 14:29:12 PM
Yeah, this power plant would probably push a 3.9m hull pretty Well?
But it's a slippery slope to go down...2-300mm longer
100mm wider
But higher sides
2x more stringers
Bugger, more comfy back seats
Next minute the boat weighs another 100kg and is feeling a bit lethargic compared to a v8 and when you run aground all your "mates" are nowhere to be seen... l-l

I've seen it too many times, somebody sets out to make a nice small light boat. They start with a small light engine but everything else balloons out of proportion....
Title: Re: J30a Honda repower
Post by: mohawk on December 24, 2018, 17:58:13 PM
Kinda like
3mtr Carbed suzuki 300kg...78km
3.6mtr ..honda ....500kg...88km
4.3mtr ...ls1......700kg...98km
 Mohawk 72kg
jeff    88kg
Lazy plus Jet tec , add lots  l-l
Thats about as light as you can build a good stong boat in each case give or take..
Title: Re: J30a Honda repower
Post by: silvafox on December 24, 2018, 19:53:19 PM
3.65 m18 turbo weight unknown 102.
Title: Re: J30a Honda repower
Post by: mohawk on December 24, 2018, 20:20:20 PM
3.65 m18 turbo weight unknown 102.
I posted average boat /motor /weight and speed expectations .
What sort of warranty is offered on a weeny engine under that much load ?
Title: Re: J30a Honda repower
Post by: silvafox on December 24, 2018, 20:48:08 PM
They're quite conservative...
Not that much load, under 1 bar.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on December 24, 2018, 21:31:35 PM
Quote

Total likes: 5
View Profile  Email  Personal Message (Online)

Re: J30a Honda repower
« Reply #241 on: Today at 19:53:19 »
Quote
3.65 m18 turbo weight unknown 102

Bahahaha 102 what?
Come on Silverfish let's keep it real
Title: Re: J30a Honda repower
Post by: silvafox on December 24, 2018, 21:35:28 PM
No crap.
Title: Re: J30a Honda repower
Post by: mohawk on December 24, 2018, 21:50:08 PM
Bahahaha 102 what?
Come on Silverfish let's keep it real
I believe him lazy , everyone knows they are fast ... its only when naughty owners abuse them that it all turns too crap...

I imagine the pump is a 612 ??
What blade combo and Nozzel and what is the wot rpm Mr fox ?
Title: Re: J30a Honda repower
Post by: silvafox on December 24, 2018, 21:58:26 PM
Shitty fuel ,bad tunes and poor maintenance is where crap goes wrong.
You'd guess right but that's as much as I can tell ya.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on December 24, 2018, 22:55:26 PM
Must be something majorly wrong with the ones I know, both the Suzuki M18 turbo and also the supercharged M16 running the Scott 612 ...... as they are missing 20kph.
Either these pumps weren't sold with all the "magic" or else 100kph is just good old fashioned BS
Title: Re: J30a Honda repower
Post by: mohawk on December 25, 2018, 00:00:02 AM
Shitty fuel ,bad tunes and poor maintenance is where crap goes wrong.
You'd guess right but that's as much as I can tell ya.
Actually most of the storys ive heard are the same as the ones lazy has heard... It would be just wonderfull to know exactly what bits spinning at what rpm give this truely mind boggling speed  ii
Title: Re: J30a Honda repower
Post by: Jeff B on December 25, 2018, 09:10:02 AM
Must be something majorly wrong with the ones I know, both the Suzuki M18 turbo and also the supercharged M16 running the Scott 612 ...... as they are missing 20kph.
Either these pumps weren't sold with all the "magic" or else 100kph is just good old fashioned BS

It can be done Lazy!
GPS speed measured on river, fast flowing river in questionable reception/satelite area. Quite often the GPS will "Miss" a point momentarily and you will see a huge jump in speed(on the GPS not for real) Often spikes of 10km/hr are recorded.
Add that to the swift, shallow  river going downstream you get another 10ks (on the GPS not for real)

The Cellphone speed apps are a joke, i tried a few and they are all over the plae compared to a proper GPS and even that struggles sometimes.
 I will come back from a run and there is a peak speed 10ks well above my actual speed....

I have raced a few 60mph (according to owners) jetskis on the lake and pass them while doing 55mph... l-l
Title: Re: J30a Honda repower
Post by: mohawk on December 25, 2018, 09:29:08 AM
Depending on the phone / app and the gps your comparing it too.
My gps and phone are later and flasher than yours jeff and they mirror each other almost exactly.
If anything i would rate the phone alot higher than an older gps like you have ...

Hunting in the kaimais with a mate i had the old yellow Etrex (like jeffs) and a mate had the new Garmen 64
The etrex was always playing catch up over the 2 days we were there. sometimes 20 miniutes behind.
Title: Re: J30a Honda repower
Post by: mohawk on December 25, 2018, 09:41:25 AM
Too there credit , foxys mates may be useing an abacuss and sun dial too determine boat speeds and truely believe the results  O)))) O))))
Title: Re: J30a Honda repower
Post by: silvafox on December 25, 2018, 09:55:26 AM
Perhaps I mispoke. Since it seems to be unusual/unbelievable and in sight of Jeffs comment I'll hold fire on a figure. A sundial and abacus was considered but with the significant added weight duu to the concrete base we considered the result would be inaccurate. We also considered a sextant but the high speed maneuvers under moonlight was too dangerous to justify.

Title: Re: J30a Honda repower
Post by: mohawk on December 25, 2018, 10:08:08 AM
Ha ha... b>
Marry xmas foxy... Anything too keep this board alive
Title: Re: J30a Honda repower
Post by: silvafox on December 25, 2018, 12:43:56 PM
Hah yeah nothing wrong with a healthy bit of debate.
I'll have a build thread coming up soon if I get a chance to get around to it so hopefully that'll get some interest going!

Title: Re: J30a Honda repower
Post by: Jeff B on December 29, 2018, 18:35:34 PM
Bit more testing. Trim is just right (without a trim nozzle) full tank fuel 2 up it will give the slightest porpoise every now and then. Flattens out above 4000rpm.
Minimum plane is 2350rpm
Happily cruising 2500rpm
Unit getting a bit noisy above 4000rpm (wind noise getting up there too).
Title: Re: J30a Honda repower
Post by: Jeff B on December 29, 2018, 18:38:10 PM
Welded a hand rail in for passenger. Mrs was complaining about getting chucked around. This setup has heaps of punch  compared to the piddly 7" units... st
Title: Re: J30a Honda repower
Post by: Jeff B on December 29, 2018, 18:43:32 PM
These auto retracting tiedowns are brilliant on trailer. Bolted on  they retract so don't have to disconnect from trailer.
Thanks  Bunning's..
..I wonder how long until the little spring inside rusts up.... pop
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on December 29, 2018, 19:19:44 PM
Mine in the bin already. 
Get grit in them when reversing  off trailer too
Title: Re: J30a Honda repower
Post by: mohawk on December 29, 2018, 19:21:00 PM
they will get pinched in his neighbourhood anyway . l-l
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on December 29, 2018, 22:17:12 PM
Build a bit more weight in to your boat and you won't need to tie them down
Title: Re: J30a Honda repower
Post by: Warwick Marflitt on December 29, 2018, 22:23:21 PM
Jeff is the J30a v6 a candidate for carb/carbs and a distributor. I haven't been close enough to get a good look at the end of the heads. To see if a dizzy I'd fit.
Title: Re: J30a Honda repower
Post by: Warwick Marflitt on December 29, 2018, 22:25:29 PM
Jeff is the J30a v6 a candidate for carb/carbs and a distributor. I haven't been close enough to get a good look at the end of the heads. To see if a dizzy I'd fit.
Title: Re: J30a Honda repower
Post by: Jeff B on December 30, 2018, 07:20:03 AM
Jeff is the J30a v6 a candidate for carb/carbs and a distributor. I haven't been close enough to get a good look at the end of the heads. To see if a dizzy I'd fit.

Yep the heads have the plug in the back, central to cam that  an be un  bolted. I don't think the camshaft has anything on the end though so will need to be modded for drive. Not sure there is a 6 cyl dizzy off the shelf that will suit? Most are long, falcon, Holden, jeep etc...
Fuelling will be a bit more complicated if wanting to run bike carbs....a single carb makes ifold could be made but single carbs suck compared to bike ones. Anything will end up pretty high.
Title: Re: J30a Honda repower
Post by: Warwick Marflitt on December 30, 2018, 21:49:27 PM
A 2 inch SU carb and NEW Ignition Distributor for 1997-2004 Mitsubishi Diamante V6 3.5L MD374448 simplicity and reliability right there.
Title: Re: J30a Honda repower
Post by: Jeff B on December 30, 2018, 22:23:32 PM
Nope.
That dizzy is from an injected Mitsubishi.  No mechanical advance.
SU carbs...well if the poms can make a carb that leaks oil....its an SU
...
Title: Re: J30a Honda repower
Post by: Jeff B on January 03, 2019, 17:03:28 PM
Boat now has 6 hours on it. Started playing up, running rich and spewing fuel out the exhaust and missing terribly.  >:(but at least was still starting). For a moment o thought it had converted into a 2 stroke... but no...the MAP sensor was playing up...thought it was in boost all the time...swapped it out and fixed. That was a $12 Ali Express sensor and I advise not to use them...or take a spare... b>
Title: Re: J30a Honda repower
Post by: Jeff B on January 03, 2019, 17:07:11 PM
Still had a good weekend playing with the weeny boats. The 2 stage thrust makes up for the extra weight so could still put a few little boats to shame in the shallows.
Good for towing too aye karl... l-l st
Title: Re: J30a Honda repower
Post by: Kakapo76 on January 03, 2019, 19:13:01 PM
I am looking for a wee project between projects- thought I might take a crack at an ITB setup on a J30a4-

I am having a bit of difficulty finding an appropriate dizzy- I can get stuff out of the US but would prefer to source locally- does anyone have a recommendation as to a vacuum/mechanically advanced dizzy that might work- I am not familiar with v6's much so would like a car or model to start searching for.

Will post build as I go for the normal entertainment purposes  l-l

BTW the raw water system works well- on the 1zz-fe- just chasing an oil leak so engines coming back out. Will post pics/ vid shortly.
Title: Re: J30a Honda repower
Post by: Jeff B on January 03, 2019, 22:29:45 PM
I'm not aware of any 6 cyl dizzys that would easily modify to run off the cam? Most I've seen seem to run off crank(long drive) maybe check a falcon dizzy?
Or old Holden 6? Doesn't need to be a v6 as the straight 6 has same firing separation (60deg)
Just not the old odd fire Buick 6, that has uneven firing order be cause it was a 90 deg v6( made from a v8 with 2 cylinders  chopped off)
You can belt drive a dizzy off the  crank 2:1
Anything is possible with modification
.....
Title: Re: J30a Honda repower
Post by: Kakapo76 on January 03, 2019, 22:44:08 PM

You can belt drive a dizzy off the  crank 2:1
Anything is possible with modification
.....

I saw this setup in a build from ages ago- is that 2 crank rotations to 1 distributor?
All the v6 engines I have looked at are FI- you have to go back to the early eighties to see a carby v6

this might be a possibility?
https://www.trademe.co.nz/motors/car-parts-accessories/holden/engines/listing-1896677837.htm?rsqid=2bd853caeb8d4e2691b96cff2dce171b

Title: Re: J30a Honda repower
Post by: Jeff B on January 03, 2019, 22:56:56 PM
Yes distributor runs at half crank speed (cam speed)
You would still have to check rotation (some  clockwise, some anti-clockwise)
You don't have to run a dizzy, I set up a Suzuki on carbs without dizzy  used motorcycle ignition  pickups and CDI to control spark advance.
Anything is possible but not always practical.... 2c
Title: Re: J30a Honda repower
Post by: mohawk on January 10, 2019, 19:33:12 PM
Theres always more too these threads than alot of guys get a chance too post (aye Mark ) .
Lucky Mohawks here too help out .. b>
Title: Re: J30a Honda repower
Post by: Markg on January 10, 2019, 20:01:05 PM
Theres always more too these threads than alot of guys get a chance too post (aye Mark ) .
Lucky Mohawks here too help out .. b>
Cant talk if you're not allowed to st
Title: Re: J30a Honda repower
Post by: Vlad on January 18, 2019, 03:28:53 AM
Hi guys !
We have been in Russia for 3 years already and we are using Honda J Series engines with our JBP200 pumps and boats we are building. We did projects with J30A1, but we prefer J30A4 (247 h / p). We are also doing the project J35A5, with an alternative ECU block "Corvette" (made in Russia) for the sake of ease of maintenance and the main reduction in fuel consumption by 25% compared with the regular unit. Here are some of our projects and photos / videos.
With respect to the participants ..

https://youtu.be/goPprm6OtnQ

https://youtu.be/bOLBDAS3caU

https://youtu.be/-BbvtMG8YmM

https://youtu.be/H7zajoIM_CQ

https://youtu.be/C5bDxSo32J4

https://youtu.be/l_rhReYWB2M

https://youtu.be/oZJOXbrjtpo

https://youtu.be/WwO-uNhNw_4

(http://forumimage.ru/uploads/20190116/154765083405439982.jpg)
(http://forumimage.ru/uploads/20190116/15476508396027639.jpg)
(http://forumimage.ru/uploads/20190116/154765084603944839.jpg)
(http://forumimage.ru/uploads/20190116/154765085191369041.jpg)
(http://forumimage.ru/uploads/20190116/154765085748524843.jpg)
(http://forumimage.ru/uploads/20190116/154765086325798496.jpg)
(http://forumimage.ru/uploads/20190116/154765086906467818.jpg)
(http://forumimage.ru/uploads/20190116/1547650876724551.jpg)
(http://forumimage.ru/uploads/20190116/154765088226642897.jpg)
(http://forumimage.ru/uploads/20190116/154765088824192566.jpg)
(http://forumimage.ru/uploads/20190116/154765089402091992.jpg)
Title: Re: J30a Honda repower
Post by: Kakapo76 on January 18, 2019, 10:15:58 AM
Great videos, thanks for sharing. What ECU are you using on the j30?
Title: Re: J30a Honda repower
Post by: Vlad on January 18, 2019, 12:03:32 PM
Great videos, thanks for sharing. What ECU are you using on the j30?

"Staff" from the car. His firmware has been changed to Euro 2, the immobilizer and the oxygen sensors of the catalyst are disconnected, the A4 motor and the generations above have an electronic shutter, all of this must be taken into account when swapping ...
Title: Re: J30a Honda repower
Post by: Vlad on January 18, 2019, 12:29:50 PM
A comparison chart of the Honda J30A 1 engine with Toyota and Nissan, as well as J30A4 power / torque.
Title: Re: J30a Honda repower
Post by: Vlad on April 03, 2019, 01:13:20 AM
Hi guys!

They made another motor, the Euro-0 firmware, removed all the egology, removed all the restrictions on turnover. The engine spun up to 9000 prm ...

https://youtu.be/HoOuM0xdVMQ
Title: Re: J30a Honda repower
Post by: mohawk on April 04, 2019, 14:30:38 PM
I saw this setup in a build from ages ago- is that 2 crank rotations to 1 distributor?
All the v6 engines I have looked at are FI- you have to go back to the early eighties to see a carby v6

this might be a possibility?
https://www.trademe.co.nz/motors/car-parts-accessories/holden/engines/listing-1896677837.htm?rsqid=2bd853caeb8d4e2691b96cff2dce171b
Jeep 4.1 hei dizzy (150usd )
.. spins tge right way...easy too shorten
.. shaft runs in a brass bush at the tip ....
Title: Re: J30a Honda repower
Post by: ruru on April 13, 2019, 08:21:52 AM
Hi, I have a J53c Hamilton with the old essex v6 {still runs fine} and am in the process of fitting a J30A out of the honda odyessy prestige with said 210 hp. Making my own wet exhaust out of aluminium, log style. Have made adapter to fit essex flywheel { as the essex ring gear works and my drive shaft will bolt straight back on } and mounting starter at top just under thermostat so out of the way of my exhaust system. This is a project in progress and is going to take time but will let you know as time permits. Good luck with your project
Title: Re: J30a Honda repower
Post by: Jeff B on April 13, 2019, 08:47:25 AM
As you can see, these j30 engines are worth nothing to buy.
I picked up another L15 engine from local wrecker and he had 5x j30's in the corner, never sold one. Nearly ready for scrap metal time....
If you have the time/know how to marinize one it's a good cheap option.
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on April 13, 2019, 14:51:05 PM
Wonder who the lucky guy is that scored that deal.....oh that's right it was me.
Now what am I going to do with it??? Other than start a collection of un-sortafter Honda engines.
Title: Re: J30a Honda repower
Post by: mohawk on April 13, 2019, 15:11:50 PM
Wonder who the lucky guy is that scored that deal.....oh that's right it was me.
Now what am I going to do with it??? Other than start a collection of un-sortafter Honda engines.
There are always good deals lazy , but there is never the shed space....
Whats scrap value of a j30 ?
Title: Re: J30a Honda repower
Post by: Jeff B on April 13, 2019, 16:31:59 PM
There are always good deals lazy , but there is never the shed space....
Whats scrap value of a j30 ?

More than an R18.....30% more
Title: Re: J30a Honda repower
Post by: Vlad on April 18, 2019, 21:00:06 PM
Hi, I have a J53c Hamilton with the old essex v6 {still runs fine} and am in the process of fitting a J30A out of the honda odyessy prestige with said 210 hp. Making my own wet exhaust out of aluminium, log style. Have made adapter to fit essex flywheel { as the essex ring gear works and my drive shaft will bolt straight back on } and mounting starter at top just under thermostat so out of the way of my exhaust system. This is a project in progress and is going to take time but will let you know as time permits. Good luck with your project

 b>
Title: Re: J30a Honda repower
Post by: HJB on September 06, 2019, 11:01:41 AM
J35A4 onto a Southernjet close coupled. Too close really so had to rotate the intake manifold 180 degrees. In a 3.6 LVB. Chipped engine to around the 280 HP mark. 
Title: Re: J30a Honda repower
Post by: Kakapo76 on September 06, 2019, 15:58:15 PM
That looks super tidy- I imagine the holeshot is excellent. Well done!  b>
Title: Re: J30a Honda repower
Post by: Kakapo76 on September 07, 2019, 13:35:14 PM
J35A4 onto a Southernjet close coupled. Too close really so had to rotate the intake manifold 180 degrees. In a 3.6 LVB. Chipped engine to around the 280 HP mark.

What ecu are you using?
Title: Re: J30a Honda repower
Post by: Jeff B on September 07, 2019, 14:14:15 PM
What ecu are you using?

Factory Honda ECU modified by a company in the US.
Title: Re: J30a Honda repower
Post by: Kakapo76 on September 07, 2019, 17:36:34 PM
Got a link Jeff?
Title: Re: J30a Honda repower
Post by: HJB on September 09, 2019, 14:17:50 PM
Jeff knows more about my boat than I do, and Ive never met him. haha.

https://markedmotorsports.com/20022004-honda-35l-v6-300-hp-p-48.html

You can buy some of the mods like the ECU rather then the entire engine.

Mike @ Liquid Volitional Boats did the install, quality work.
Title: Re: J30a Honda repower
Post by: Kakapo76 on September 09, 2019, 21:03:53 PM
Thanks very much b> I found another crowd as well but not as neat and tidy product and quite a bit more expensive. Looking forward to seeing a video of your boat running!
Title: Re: J30a Honda repower
Post by: Jeff B on September 20, 2020, 07:26:20 AM
J30a6 from an Accord aspire.
Trying to keep this one as light as possible and see what revs I can pull on smaller diameter 2 stage pump.
This model has the front crank trigger wheel, easy to modify to run off virtually any aftermarket ECU.
Title: Re: J30a Honda repower
Post by: Jeff B on September 20, 2020, 07:30:22 AM
Heat exchanger too heavy so just running a simple raw water mixer tank. Hopefully works ok with factory thermostat.
Title: Re: J30a Honda repower
Post by: Jeff B on September 20, 2020, 07:35:05 AM
Quite high hi risers for exhausts as it will.likely sit low in the water at times.
The hull to engine ratio of 1:1 (3.0m, 3.0 litre) is slightly skewed in the overweight direction for a small boat....
But will hopefully blow a boosted L15a into the weeds... pop (not shallow water starts though....)
Title: Re: J30a Honda repower
Post by: Jeff B on September 22, 2020, 07:24:35 AM
Front engine mount.
Title: Re: J30a Honda repower
Post by: Jeff B on October 03, 2020, 13:21:17 PM
Drive block.
I hacked up an old Polaris impeller(22mm spline) and press fit into 304 stainless drive block. 0.08mm interference fit, very tight. Then I welded it too...
Title: Re: J30a Honda repower
Post by: Jeff B on October 12, 2020, 08:33:32 AM
The J35a8 from the Legend is a bit different, seems to be a good model to get. Identical dimensions to the j30a5/a6 but has the better v tec setup and more power. Has the crank sensor on front of engine that is easily modified, the cam trigger is slightly different but also easily modified.
These were in the 4wd Honda Legend luxury car.
Title: Re: J30a Honda repower
Post by: Matthewf/Norbert/TuiDog on October 12, 2020, 12:04:43 PM
looking awesome Jeff
Title: Re: J30a Honda repower
Post by: georgemcf on October 12, 2020, 23:12:24 PM
Thats the same spec I have. $220 pick-a-part special  *-)

Im still working on exhausts for mine. Have Brendon from ali-art using my engine as a mock up for a set of his water cooled ones. But also still like your low profile ones Jeff...

The J35a8 from the Legend is a bit different, seems to be a good model to get. Identical dimensions to the j30a5/a6 but has the better v tec setup and more power. Has the crank sensor on front of engine that is easily modified, the cam trigger is slightly different but also easily modified.
These were in the 4wd Honda Legend luxury car.
Title: Re: J30a Honda repower
Post by: Jeff B on October 13, 2020, 04:57:36 AM
Yeah the late model holden/chev v6 has a very similar exhaust setup and the ali art riser is near identical, wo t take much to modify to fit the honda.
I see Link still doesn't have a trigger setup for these?
Title: Re: J30a Honda repower
Post by: Vlad on October 13, 2020, 05:02:39 AM
Cool  ! B))T
Title: Re: J30a Honda repower
Post by: Vlad on October 13, 2020, 05:25:41 AM
The J35a8 from the Legend is a bit different, seems to be a good model to get. Identical dimensions to the j30a5/a6 but has the better v tec setup and more power. Has the crank sensor on front of engine that is easily modified, the cam trigger is slightly different but also easily modified.
These were in the 4wd Honda Legend luxury car.

Class, we will have this next stage of the motor, we are now making a J30A4 from Inspire (Japanese market), it ideally matches our JBP200 water jets in terms of torque, fuel consumption and weight. Also for water jets we make a Honda R20A but for pump size 180 mm
Title: Re: J30a Honda repower
Post by: Vlad on October 13, 2020, 05:30:43 AM
Yeah the late model holden/chev v6 has a very similar exhaust setup and the ali art riser is near identical, wo t take much to modify to fit the honda.
I see Link still doesn't have a trigger setup for these?

We will completely reprogram the standard ECU, remove all ecology and oxygen sensors, make Euro-0 firmware
Title: Re: J30a Honda repower
Post by: georgemcf on October 13, 2020, 08:24:47 AM
No its looking like it is just a put of a port shape change and a different stud pattern.

No they don't yet. I was going to get an oscilloscope capture for them once I got that far with mine.
But I have since found a Motec m800 in the workshop that I'm going to use instead.

I Should start a build thread for mine...

Yeah the late model holden/chev v6 has a very similar exhaust setup and the ali art riser is near identical, wo t take much to modify to fit the honda.
I see Link still doesn't have a trigger setup for these?
Title: Re: J30a Honda repower
Post by: Vlad on October 14, 2020, 22:01:37 PM
Here are some of our videos on this motor, how we make it and how it works with our water jets on different boats, sorry, in Russian .. ;)


https://youtu.be/woVNmQTdHVs
 
https://www.youtube.com/watch?v=HoOuM0xdVMQ&t=2s
 
https://www.youtube.com/watch?v=9PX2M9XRfvU&t=4s
 
https://www.youtube.com/watch?v=C5bDxSo32J4&t=858s
 
https://www.youtube.com/watch?v=M__tsQpJzOA&t=19s
Title: Re: J30a Honda repower
Post by: Jeff B on October 30, 2020, 21:28:31 PM
https://youtu.be/7Zb-5ad1h6o
Title: Re: J30a Honda repower
Post by: Ross Goldsack - JBNZ Immediate Past President on October 30, 2020, 22:44:24 PM
A bit smokey?
Title: Re: J30a Honda repower
Post by: Jeff B on October 31, 2020, 07:26:51 AM
A bit smokey?

That would be the 40:1 2 stroke mix ....
The 2-1-2 exhaust seems pretty quiet and no grunty induction noise like Roddys.
A bit lame really....
Might need to load in the high rpm tune to make it scream
Title: Re: J30a Honda repower
Post by: georgemcf on November 02, 2020, 20:44:14 PM
Sounds grouse.

I really like your headers/pipe.

https://youtu.be/7Zb-5ad1h6o
Title: Re: J30a Honda repower
Post by: Jeff B on December 02, 2020, 17:16:50 PM
Link have the goods to run the std j30a4 trigger setup. I think it's the same as j35a8, will have to check when I pull cam belt off.
Title: Re: J30a Honda repower
Post by: Jeff B on December 28, 2020, 19:38:21 PM
Got the j30 cranked up, had a few teething issues, had the timing retarded by 12 degrees...everywhere....and had to do a few modifications to my rawxwater setup that resulted in a very hot engine....
Didnt stop me from getting a bit of a tune done but kept dropping a cylinder or 2 at idle....ended up blown head gasket on 2 cylinders.
Got the wee v6 screaming to 6000rpm about 95km/hour.
Pretty impressed with the higher revving performance on smaller pump
Title: Re: J30a Honda repower
Post by: Kakapo76 on December 31, 2020, 14:44:20 PM
Looking good Jeff, that's pretty damn quick! I am getting about 5500 rpm out of mine at the moment but suspect I am quite significantly slower due to weight and the Colorado pump? Once I get the wee electrical short gremlins sorted, I am going to play with nozzle inserts a bit and see if the v6 likes a smaller hole.

Out of curiosity on your 2 stage 158mm pump, what is the nozzle size?
Title: Re: J30a Honda repower
Post by: Kakapo76 on December 31, 2020, 16:10:38 PM
Another couple of questions, what is your total timing when it's all in, and at what rpm does that occur? I found the engine seemed to be happier at around 28 deg all in?

Do you notice or feel the vtec engage? I can't tell if mines working or not at this point, I might have to remove the driveshaft to test it on a hose and actually feel the solenoid to see if it is moving or not.
Title: Re: J30a Honda repower
Post by: Jeff B on December 31, 2020, 20:05:29 PM
Just checked and currently only running 26.3 deg advance at full noise.
I'm not running vtec on this engine, it's the VCM model so only has the grunty cam.
Seems pretty happy on tbe 158mm 2 stage and supposedly makes peak hp around 6000rpm so seems to perform pretty well.
Title: Re: J30a Honda repower
Post by: georgemcf on January 01, 2021, 08:43:41 AM
Got the j30 cranked up, had a few teething issues, had the timing retarded by 12 degrees...everywhere....and had to do a few modifications to my rawxwater setup that resulted in a very hot engine....
Didnt stop me from getting a bit of a tune done but kept dropping a cylinder or 2 at idle....ended up blown head gasket on 2 cylinders.
Got the wee v6 screaming to 6000rpm about 95km/hour.
Pretty impressed with the higher revving performance on smaller pump

Looking forward to the onboard footage  ;D
Due to a broken wrist my xmas holiday build plans have been put on hold
Title: Re: J30a Honda repower
Post by: georgemcf on January 01, 2021, 21:02:54 PM
Just checked and currently only running 26.3 deg advance at full noise.
I'm not running vtec on this engine, it's the VCM model so only has the grunty cam.
Seems pretty happy on tbe 158mm 2 stage and supposedly makes peak hp around 6000rpm so seems to perform pretty well.

Do you think the 6.1 scott would handle the j-series engines based on this jeff? Or be better with a 7"?
Title: Re: J30a Honda repower
Post by: Jeff B on January 02, 2021, 19:19:07 PM
Do you think the 6.1 scott would handle the j-series engines based on this jeff? Or be better with a 7"?
I think the Scott 612 is likely too low for the J series v6?
Not sure on the 7" SJ?
I'm working on a Hamilton 751.5 for the Honda v6 currently, dual row impeller and extended wear ring section
Title: Re: J30a Honda repower
Post by: georgemcf on January 02, 2021, 20:53:22 PM
I think the Scott 612 is likely too low for the J series v6?
Not sure on the 7" SJ?
I'm working on a Hamilton 751.5 for the Honda v6 currently, dual row impeller and extended wear ring section

Yeah that is true. I forgot about the height
The SJ7" is a common option for them.
Title: Re: J30a Honda repower
Post by: georgemcf on January 10, 2021, 17:42:27 PM
Jeff what flywheel do you throw on the back of your j engines?
Title: Re: J30a Honda repower
Post by: Jeff B on January 10, 2021, 20:49:05 PM
Jeff what flywheel do you throw on the back of your j engines?

Couple of options.
The lightweight chromoly flywheel.
Or the super lightweight ali 6061 with steel ring gear.
K20/24 they bolt straight up to the v6 crank
Title: Re: J30a Honda repower
Post by: Kakapo76 on January 10, 2021, 21:57:32 PM
I got a ring gear welded to my flex plate- $150 by a transmission shop in CHCH
Title: Re: J30a Honda repower
Post by: georgemcf on January 10, 2021, 22:22:34 PM
I got a ring gear welded to my flex plate- $150 by a transmission shop in CHCH

And going all good so far? I have the torque convertor and flex plate from when I picked the engine up from pick-a-part (After 4hr of pulling the engine out I had had enough of working there), and was toying with doing exactly that this afternoon. I know Mike @ Harris Marine machines an alu one and starter mount to suit.

If only I had my cnc id do my own...

p.s there is a j30a4 at pick-a-part chch, arrived friday. Is just minus a starter now  O0
Title: Re: J30a Honda repower
Post by: Kakapo76 on January 11, 2021, 09:06:02 AM
It's holding up fine so far but doesn't have lots of hours- it's quite a thick plate and the trans shop felt it was totally fine.

I managed to get an A4 at the weekend, will persevere with the a1 for the moment to get the most out of it and probably swap it out later in the year when I get a chance. I am still mucking around with the vtec and carbs so happy to potter at this stage.
Title: Re: J30a Honda repower
Post by: JohnR on January 12, 2021, 19:13:18 PM
K20/k24 flywheel/flexi ring gear protrudes much less than the j30 one.  As in you have to mount starter different again.
This is a k24 flexi.  None of the gearbox holes can share the bolts with the starter motor with k20/k24 ring gear.  Its a real custom jobby to make it fit
Title: Re: J30a Honda repower
Post by: Jeff B on January 12, 2021, 20:14:10 PM
Hey John, have you moved the mixer yet or does the exhaust still pre heat it?
You need to tape up all those wires too...
Title: Re: J30a Honda repower
Post by: Jeff B on January 12, 2021, 20:18:06 PM
I ordered a complete gasket set to fix my blown head gasket, but its ages away $110
Sick of waiting so picked up another complete donk for $150 to fiddle with in the meantime.
I think this one is a J30A6.
Title: Re: J30a Honda repower
Post by: JohnR on January 12, 2021, 20:40:40 PM
Hey John, have you moved the mixer yet or does the exhaust still pre heat it?
You need to tape up all those wires too...

Na jeff ive soldered my wires. We dont use tape here in the south, yup mixer moved
Title: Re: J30a Honda repower
Post by: Jeff B on January 16, 2021, 20:42:57 PM
Swapped in another j30 I think an a6?
Intake manifold slightly different but everything seems the same.
So quick and easy just bolting stuff and swapping over (compared to fabricating stuff)
Title: Re: J30a Honda repower
Post by: Jeff B on January 16, 2021, 20:45:24 PM
Dropped in the 3.0 hull and did a bit more tuning.
Pulling 6200rpm flat out 13.5afr
About 95km/hour.
It's pretty quick, loves the revs.
Seems like I have my raw water setup working now too, the blown head gasket was not helping the situation on the old engine...
Title: Re: J30a Honda repower
Post by: Jeff B on January 17, 2021, 20:52:21 PM
https://youtu.be/BYUh2gBvxec
Title: Re: J30a Honda repower
Post by: scrmn8 on January 19, 2021, 22:33:17 PM
im also playing with the j30a1 and j30a4 using  a link at the mo but will get back to making stock ecu work at a later date for others as a cheap repower... cool wee motors! whats the pump/ blade combo? have mine in a we figlass fireball with a 742
Title: Re: J30a Honda repower
Post by: Jeff B on January 20, 2021, 08:06:46 AM
My J30 is running a small 158mm pump.
The impellers are pretty angry, front is 16-21 skat trak 3 blade.
Rear is 24 deg constant 4 blade.
Despite being small diameter I cant get it to slip at all, hangs on good.
Cruises nicely at 3500rpm. Its "geared" pretty low and loves the revs but I guess that's what's required to get all the available horsepower out of the wee thing?
I have figured out how to modify the factory thermostat/cooling setup now too so it's relatively simple to run raw water without plumbing in a big ugly SCS mixer.
Title: Re: J30a Honda repower
Post by: Jeff B on January 20, 2021, 08:22:07 AM
https://youtu.be/7QoetUM1JVs
Title: Re: J30a Honda repower
Post by: Kakapo76 on January 20, 2021, 10:09:00 AM
That v6 is fair humming along- very impressed. Have you considered making a unit for sale.... hint, hint  cou
Title: Re: J30a Honda repower
Post by: georgemcf on January 20, 2021, 22:39:21 PM
That v6 is fair humming along- very impressed. Have you considered making a unit for sale.... hint, hint  cou

And exhaust setup...hint hint
Title: Re: J30a Honda repower
Post by: Warwick Marflitt on January 21, 2021, 11:31:46 AM
But then Jiff would have to give up his day job ()() and play would become work hb and fun would not ang-- longer be exciting and  >>@ we'd loose another one of the best things about our chosen sport/leisure time activity and Freedom, to be innovative and express our mechanically wild side..... B))T B))T B))T Just do what he does, have a crack and build your own....
Title: Re: J30a Honda repower
Post by: Jeff B on January 22, 2021, 08:04:43 AM
Its not really cost effective st my labour rate.
But fun trying new things.
Title: Re: J30a Honda repower
Post by: scrmn8 on February 02, 2021, 06:28:07 AM
so didn't take laptop so not sure of revs but still got the stock 19s but converted to nozzle with 110 insert... gates were about 103 n only pulled 4200. slips getting out of the water now but grips after a bit n revs out nice n seems alot quicker.... is it plausible that I can leave nozzle at 110 n ditch the front 19 for say a bullet 17 n it will sort the slip but still allow it to rev out?, also about to pick up a j30a4 (was to cheap not to) so will put it on our engine dyno with the link n let ya know some real world  results of what power it makes n where peak torque is... norm honda don't leave alot on the plate but  typically there's 15 - 20hp to claim
Title: Re: J30a Honda repower
Post by: JohnR on February 02, 2021, 06:44:29 AM
Not plausible, use smaller nozzle insert with finer blades, 16 or 15 bullet 17 or 16 rear with 100mm nozzle would be a better starting point
Title: Re: J30a Honda repower
Post by: Jeff B on February 02, 2021, 08:18:06 AM
I dont think that running a big nozzle and fine blades will be ideal? Don't really want any slip at all. The single stage units on sr20setc run a huge nozzle to try get the revs up but you don't make much pressure or speed.
Have seen some 2 stage setups with 108mm nozzle though but not much wear and they are slipping.
What's the j30a4 out of?
There seem to be 2 different versions, maybe the import aspire?
Mine has the vcm vtec which disables one bank of valves. So I'm essentially not running any kind of vtec. It has the vtec solenoid on back of head. Instead of down by oil filter.
Title: Re: J30a Honda repower
Post by: Jeff B on February 02, 2021, 08:38:54 AM
Fiddling with the j35, this block is actually slightly different to the other j30/35, in the bell bellhousing area, the flex plate/ring gear is bigger and starter motor totally different. I guess because it was 4wd
This must be the super grunty spec, 11:1 compression and oil squirters for pistons. Will need to get it ul around 6000rpm to make the claimed 290hp I think....
Tried swapping the intake manifold around to face forward to make exhausts easier. Fitted that way but the throttle body poked forward quite a way and with an air filter or pipework on front makes the setup way too long, if it's that long I'll just use a v8 instead....
Put the intake back where it was and bent balance pipe around it.
Title: Re: J30a Honda repower
Post by: Kakapo76 on February 02, 2021, 11:04:14 AM
so will put it on our engine dyno with the link n let ya know some real-world  results of what power it makes n where peak torque is... norm honda don't leave a lot on the plate but  typically there's 15 - 20hp to claim

Very interested to see your results- can you post the power curve and timing maps when you do this, please. If you get a chance have a play with timing and see if it has much of an effect- I am finding it's not as broad a curve as I expected.  pop
Title: Re: J30a Honda repower
Post by: Jeff B on February 02, 2021, 11:58:01 AM
I am also very interested in seeing a dyno curve. Quite often the lower spec engines, like in a heavy odyssey are lower rated hp but at lower rpm and if you overlay the dyno graphs quite often the putt bomb model makes more power at the rpm that the jet unit is limiting it to.
Properly matching pump to engine gets more critical with higher revving stuff.
Title: Re: J30a Honda repower
Post by: scrmn8 on February 03, 2021, 01:20:44 AM
yea no worries at all.. might make a day of it then n put the odyssey motor on aswell n go back to back  for comparison as im curious to see the  difference.. tuning on water is super easy n ya know ya geting somewhere when ya pick up more rpm at wot but actual data to compare has got to help for blade choices n me being able to sleep at night 😂😂.... at this point the only thing i have is there's seems to be nothing gained  putting more than about 26 degrees total in at wot. cheers to all for blade/ nozzle advice. n will keep you all posted... probably happen later on next week
Title: Re: J30a Honda repower
Post by: Kakapo76 on February 03, 2021, 09:47:01 AM
at this point the only thing i have is there's seems to be nothing gained  putting more than about 26 degrees total in at wot.

This is my experience also.
Title: Re: J30a Honda repower
Post by: Jeff B on February 14, 2021, 21:12:33 PM
Tweaked 1/2 a degree more pitch into rear impeller. This dropped rpm by about 50.
Pulling 6150rpm full noise.
Top speed exactly the same
 Felt exactly the same.
Title: Re: J30a Honda repower
Post by: Jeff B on February 17, 2021, 10:56:08 AM
Much less than half a tank when throwing boat around violently and I get air into fuel system, causing lean spike
Fitting little surge tank to stop air getting into efi pump.
Title: Re: J30a Honda repower
Post by: scrmn8 on March 04, 2021, 21:06:05 PM
sorry can't be bothered figuring out resizing pics to upload but had old lazy odyssey j30 on dyno today... 4300 to 5200 is its peak torque sweet spot  n it made 199hp n 200ft lbs of torque until I ran out of gas 😂😂 also 3700 is the magic spot for vtec switching.. any sooner or later n it dips  in the torque curve. unfortunately ran out of gas but it appears there's terrible valve float above 5500rpm... watch this space 👍
Title: Re: J30a Honda repower
Post by: Kakapo76 on March 05, 2021, 11:03:06 AM
any info on timing and its effects?
Title: Re: J30a Honda repower
Post by: Jeff B on March 06, 2021, 15:10:19 PM
Is valve "float" not beneficial in a boat?......🙄🤔
Title: Re: J30a Honda repower
Post by: Warwick Marflitt on March 07, 2021, 09:20:45 AM
Depends, is it dynamic lycra spring or variable volumetric bounce? Salt or fresh water? One's more buoyant than the other! cou
 Kakapo! Timing High tide or low? Is in the news paper --<
Sorry I couldn't resist  hhh
Title: Re: J30a Honda repower
Post by: Jimmy Jet on March 07, 2021, 14:19:32 PM
5500 sounds pretty low for valve float?
Title: Re: J30a Honda repower
Post by: Kakapo76 on March 07, 2021, 16:11:08 PM
I would tend to agree- I would think revs would be north of 6500 before that became an issue?
Title: Re: J30a Honda repower
Post by: scrmn8 on March 09, 2021, 20:02:21 PM
I thought so 2 but just nose dived at 5500 n didn't mater what I did with timing or mixtures
Title: Re: J30a Honda repower
Post by: scrmn8 on March 09, 2021, 20:04:05 PM
flat as torque curve tho!
Title: Re: J30a Honda repower
Post by: Jeff B on March 10, 2021, 16:27:09 PM
That looks pretty good.
Mr Honda says that engineakes peak power @5500rpm and that's what you have.
The newer J series make peak power higher up, 6200rpm ish.
Title: Re: J30a Honda repower
Post by: Jeff B on March 14, 2021, 09:44:11 AM
After chasing issues with sustained WOT rpm (slowly dropping rpm) and chasing possible engine issues I found the culprit....
My stack of 5x cheap ball bearings (assembled during lockdown so I used my steering column bearings) was overheating and binding up.
Have replaced with 2x bearings and spacers, one double row and one conventional. This is supposedly handling 3x the thrust and a lot less drag.
I really need to do sustained 6200rpm run to find the next weakest link...
Title: Re: J30a Honda repower
Post by: Jeff B on March 18, 2021, 21:33:27 PM
Opened the short intake runner flaps right up. This should help top end a tiny little bit.
Title: Re: J30a Honda repower
Post by: georgemcf on March 19, 2021, 07:03:03 AM
Have you powered up the solenoid to control them or just having them open full time?
Title: Re: J30a Honda repower
Post by: Jeff B on March 19, 2021, 10:23:12 AM
Have you powered up the solenoid to control them or just having them open full time?

Just open full time, it's a stupid stepper motor setup that controls it.
Too complicated for me to set up..
Title: Re: J30a Honda repower
Post by: Jeff B on March 19, 2021, 20:47:58 PM
Some more fiddling...
Dr Murton diagnosed my WOT problem, had my injectors set at the maximum of 8 amps saturated....
Dropped it to 2 amps and afr a lot more stable at high rpm.
Didnt get rpm range but it up a tad now.
27 deg total advance at WOT
13afr.
Getting 96 up
102 down. 
Title: Re: J30a Honda repower
Post by: Jeff B on March 19, 2021, 20:53:10 PM
Then my driveshaft floating bearing/seal sleeve slipped back on the driveshaft and left a huge gap for air to enter pump and water to enter hull....
Better glue it on better, Mohawks construction adhesive is apparently not marine grade..... ???
Title: Re: J30a Honda repower
Post by: Paul on March 19, 2021, 21:39:03 PM
Grub screw. Tapping stainless might be a bit of a nightmare though.
Title: Re: J30a Honda repower
Post by: Allen M on March 20, 2021, 09:12:18 AM
That intake casting looks like it would be half the weight of the engine.
Would make a good project to fab up a light weight version with straight tuned runners  B))T
Title: Re: J30a Honda repower
Post by: georgemcf on March 20, 2021, 09:31:56 AM
Just open full time, it's a stupid stepper motor setup that controls it.
Too complicated for me to set up..

Would be nice to have an engine dyno to play on to measure the actual gains from controlling them vs open full time etc
Title: Re: J30a Honda repower
Post by: Jeff B on March 20, 2021, 15:57:26 PM
That intake casting looks like it would be half the weight of the engine.
Would make a good project to fab up a light weight version with straight tuned runners  B))T
The intake manifold does look heavy but it is actually pretty light.
I did make one for my j35 but it's pretty hard to beat the factory shape for compactness and mine was not much lighter for a heap of work involved.
I feel my time has been better spent making the jet unit in terms of labour/performance ratio.
Title: Re: J30a Honda repower
Post by: Jeff B on March 20, 2021, 16:01:29 PM
The intake manifold does look heavy but it is actually pretty light.
I did make one for my j35 but it's pretty hard to beat the factory shape for compactness and mine was not much lighter for a heap of work involved.
I feel my time has been better spent making the jet unit in terms of labour/performance ratio.

Yeah would be interesting to see if intakes any difference but I feel it would make absolutely no difference in jet boat application?
I still dont really think you need an.engine with "low down torque" as it's not utilized unless over pumped....
Title: Re: J30a Honda repower
Post by: Jeff B on March 28, 2021, 17:49:24 PM
Bit more tuning.
27 deg advance
6300rpm.....getting up there.
Seems to love it. It's still making good power up there. Getting 99km/hour flat out
Title: Re: J30a Honda repower
Post by: JimJet on April 04, 2021, 21:40:08 PM
I?ve put a J30A4 in my 3.6 on a Berkeley. C cut Impellors. Only revs to 4300 and does 79kph on flat water. Great little engine. I?m using Holden V6 manifolds from Ali-Art. Engine is so short I have two buckets and a bench seat behind. Took 4 adults and all our gear up the Ahaura earthquake rapids today. Very happy with set up. Running a Haltech with digital dash.
Title: Re: J30a Honda repower
Post by: allforham on April 06, 2021, 07:41:55 AM
Hey jimjet are you sure the impeller is a C cut? I'm getting identical results out of my 2l diesel with what is supposed to be an A cut. I would have thought you'd get more rpm out of a c cut with a 3l? Impeller chart shows 185hp at 4300 on a c cut
Title: Re: J30a Honda repower
Post by: JohnR on April 06, 2021, 09:41:21 AM
Thats probaly correct.  Hondas rev to make hp
Title: Re: J30a Honda repower
Post by: JimJet on April 06, 2021, 11:42:51 AM
Pretty sure it's a C cut. I had it trimmed back for my race boat. SR20, 538hp at 6000rpm on the dyno. It pulled 6100rpm in my race boat in a turbine unit.
My little 3.6 is very happy at 3000rpm heading up the river at around 40 to 45kph. you can still have a conversation without earmuffs.
Couple of photos attached.
Title: Re: J30a Honda repower
Post by: Jeff B on August 21, 2021, 19:37:26 PM
Bit of spare time on my hands so started wiring up the legendary honda Legend j35a8
Title: Re: J30a Honda repower
Post by: Jeff B on August 22, 2021, 10:15:33 AM
It appears the j35a8 has different bellhousing to most the other j series engines, uses bigger ring gear/torque converter etc, must be because it was on 4wd/awd transmission. Starter is an oddball side mount ugly thing too, expensive to replace.
I'm using an aluminum k20/k24 flywheel (bolts straight on) and the trusty Subaru starter
Title: Re: J30a Honda repower
Post by: Paul on August 22, 2021, 15:00:31 PM
What's the plan for the driveblock?
Title: Re: J30a Honda repower
Post by: Jeff B on August 23, 2021, 21:36:27 PM
What's the plan for the driveblock?

I have a standard 4+4 drive block to suit spicer driveshaft, but might use a different driveshaft setup on this one.
Title: Re: J30a Honda repower
Post by: Jeff B on August 23, 2021, 21:38:32 PM
Can't get to the shops for a plastic ecu enclosure and mrs didn't let me steal the Tupperware so I made an aluminum box, lined inside with foam deck offcut. Mint.
Title: Re: J30a Honda repower
Post by: Jeff B on August 23, 2021, 21:41:17 PM
Mods to the cam pulley/cam trigger.
Grind off 2x teeth and just leave one for home signal.
Crank is now 12 equal teeth.
So running 24+1 full sync triggering, seems quite reliable
Title: Re: J30a Honda repower
Post by: Jeff B on August 24, 2021, 12:58:02 PM
https://youtu.be/_Cv5ZY9Vl0M

Fired right up. This is on E11 ecu so direct fire coils and full sequential injection.
Title: Re: J30a Honda repower
Post by: georgemcf on August 24, 2021, 19:30:13 PM
Gets me excited to get mine up and going.

Any chance of a photo of your water pipe setup where the factory thermostat is jeff? Just so I can see how you have done yours. I am assuming you are doing raw water?
Title: Re: J30a Honda repower
Post by: Jeff B on August 25, 2021, 08:18:17 AM
Yep, sorry my pictures are blurry, my phone camera is stuffed, think I got weld splatter on it.....
Can't see all but, internally I have drilled/ground out a big bypass port so water circulates freely around thermostat. Then I have blocked off old "exit to radiator" and welded 19mm barb on thermostat housing, this was the old "water in from radiator" but is now the exit for hot water.
Most modern systems have thermostat on inlet and take a bit of fiddling to make work with raw water.
The cold water in (from jet unit) is fed in steel pipe just by water pump inlet (under intake manifold)

I have same system on L15 and my j30, works good.
Title: Re: J30a Honda repower
Post by: Keltik on August 25, 2021, 17:23:08 PM
https://youtu.be/_Cv5ZY9Vl0M

Fired right up. This is on E11 ecu so direct fire coils and full sequential injection.

What happened right at the end of that vid  ;D
Title: Re: J30a Honda repower
Post by: Jeff B on September 05, 2021, 10:54:46 AM
https://youtu.be/sBoDbZ1O3lY
Title: Re: J30a Honda repower
Post by: Jeff B on September 12, 2021, 07:40:36 AM
Put the running j35 on the scales, everything on it, exhausts, balance pipe/muffler, engine mounts, rubbers, fuel pump, all electrics, full of oil etc, 169.5kg.
Base bare engine is under 120kg so it shows how much is added just to get engine in running marine trim.
Title: Re: J30a Honda repower
Post by: Allen M on September 12, 2021, 22:15:38 PM
Have you got any peak HP and torque specs for this engine to do a power to weight comparison.
Title: Re: J30a Honda repower
Post by: Jeff B on September 13, 2021, 05:49:43 AM
Have you got any peak HP and torque specs for this engine to do a power to weight comparison.

The book says this engine makes 286hp @....can't remember, close to 6000rpm I think?  But we all know numbers are not always accurate.....
This was the upper spec v6, higher compression, 11:1, piston oil squirters etc...
I guess we will see what it turns the pump to...
Title: Re: J30a Honda repower
Post by: Warwick Marflitt on September 13, 2021, 08:05:19 AM
Found these specs on line for the 35 series of engines
https://www.motorreviewer.com/engine.php?engine_id=166
Title: Re: J30a Honda repower
Post by: Jeff B on October 06, 2021, 08:37:22 AM
Rigged up cold start valve on j30. I don't have any idle speed control and when cold idles very low. I just hooked up this small solenoid valve to intake, was already there, for carbon canister I think? Let's a bit more air in when engine is cold and shuts off at 40 deg, or whatever temp I want. Switched by thermo fan output on ecu.
Title: Re: J30a Honda repower
Post by: Jeff B on December 23, 2021, 10:27:50 AM
Some more Honda v6 engine investigation...
This is a J35 out of a late model Accord, these have VCM which disengaged cylinders on command, has 3x vtec switching solenoids and it appears only 2x cylinders have fixed rocker gear so up to 4x cylinders can be turned off...
Title: Re: J30a Honda repower
Post by: cameronbezett on March 07, 2022, 22:27:28 PM
Probably been asked before but what alternator are you using on the j35a8? Busy swapping over from a j30a1 atm. Cheers