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nzjetboating.com Forums => Projects => Topic started by: JohnR on July 27, 2021, 14:45:48 PM

Title: LVB3900 J35A8 Flopro
Post by: JohnR on July 27, 2021, 14:45:48 PM
Me and a mate recently built a 3.6LVB with a Honda V6 J30a4 and 2 stage kodiak and it goes awesome, great all round boat, Mike from LVB has awesome kit-sets that go together pretty well, so were doing another, this time slightly bigger and slightly more power.

In the photos there is a pics of the 3.6 we just completed

And the other picture is of the j35a8 engine.

J35A8
Power: 286 hp (213 kW) at 6200 rpm
Torque: 256 lb⋅ft (347 N⋅m) at 5000 rpm
Compression: 11.0:1
Valve Train: 24-Valve SOHC VTEC
On the Ward's 10 Best Engines list for 2005, 2008 and 2009.


Im using this engine because Jeff is using them, soo they must be good, and then I found out why he was using them, because they are Probaly cheap any no one wants them. Haha, Na theyr lighter than a vq35 by about 10-15kg when fully marinised and shorter about 80-100mm (providing you relocate the oil filter)

Also ali-art make a manifold for the J series hondas that are 5.5kg each side.

But these engines a very difficult to track down.  They are from a KB1 honda ledgend, I spent many hrs calling wreckers to track one down and then chasing them for refunds on damaged engines twice. 

Also Im using a Flopro because they are are awesome quality, Light, Proven and Durable, Easy to get parts,  And Ive found Paul Sweeny (Flopro owner) is great too deal with.





Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on July 27, 2021, 14:53:38 PM
So far I have degreased and water blasted, removed intake (The J35 the intake is much lighter than the J30 being magnesium and not alloy), fitted a oil filter relocation block, fitted a Harris marine flywheel they have a intergrated drive block, shaved the front engine mount down for more room,fitted oil pressure sendor and have started fitting kodiak style raw water mixer.
Title: Re: LVB3900 J35A8 Flopro
Post by: Kakapo76 on July 27, 2021, 15:07:35 PM
Hi John, did you make the oil relocation block up yourself? Are these available to purchase?
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on July 27, 2021, 15:26:54 PM
TracTuff

Very expensive. Theres a bit going on with them as theres a few oil gallerys, vtec solenoid and weird gaskets with mesh filters. Like $600 NZ including freight n gst and thats without out the lines or oil filter block, i got the lines and oil filter block from alibaba. 

The stock oil filter assembley  could be cut and drilled and tapped to suit the an lines much cheaper. 
Title: Re: LVB3900 J35A8 Flopro
Post by: Mack43 on July 27, 2021, 19:26:20 PM
How heavy is that engine when its marinised?
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on July 27, 2021, 19:50:09 PM
The J30a4 was 189kg.  That was engine mounts, mixer, loom, alternator, starter motor, H-bar drive shaft, drive-block, manifolds and oil

The J35a8 should be a few kgs lighter.

The Vq35de (rwd model) I recently did was 200kg with the same bits attached.
Title: Re: LVB3900 J35A8 Flopro
Post by: Jeff B on July 27, 2021, 20:21:15 PM
There is my j35a8 (magnesium intake) with,
Exhaust headers
Balance pipe,
Alternator,
Starter,
Alloy flywheel.
Still needs drive block, fuel pump, wiring, engine mounts.
Should come in just under 160kg.
My exhausts and water mixer bit lighter
The Legend spec engine is the super grunty de luxe model, higher compression, piston oil squirters etc...
I should put mine In a boat to compare with John's.... ::)
Title: Re: LVB3900 J35A8 Flopro
Post by: Jeff B on July 27, 2021, 20:25:06 PM
The good thing about the Honda v6 is it's quite compact, only one camshaft on each head.
But the 3.5 is hard to find, there is also a 3.7 somewhere going into a boat
The 3.0 is common, almost a pest.
I have binged the j30 into 3.0m hull and it will just crack 60mph @6200rpm.
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 05, 2021, 08:45:41 AM
Progress.  Cooling system done, starter done, wiring done.  Ran first pop with the link atom.  Used exact same tune as the j30 so this confirms the trigger between the j30a3 and j35a8 are the same

Had a measure up and the j35 is 80mm shorter than the vq35.

https://youtube.com/shorts/_D8e5oJSglU?feature=share

https://youtube.com/shorts/hOWUwFTbWP8?feature=share
Title: Re: LVB3900 J35A8 Flopro
Post by: Allen M on September 05, 2021, 11:55:51 AM
Nice looking Ali flywheel  b>
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 05, 2021, 12:20:05 PM
Nice looking Ali flywheel  b>

Yea mike harris in chch makes em.  Because its a bit smaller if turns over real fast and starts quick.  Also it was a dream to fit up.  Perfectly machined and light. No drive block needed.  Hbar bolts straight up.  Only pain in the bum is getting the crank bolts.  Ya gotta make em.  Theyr like m11x1.0 or something weird.  Make em out of long m12 cap screws that are not fully threaded
Title: Re: LVB3900 J35A8 Flopro
Post by: Jeff B on September 05, 2021, 19:38:05 PM
Crank bolts are m12x1.0
I make longer cap screw ones also.
I did find some once that suited, off a Ford transit or some similar pos...
Title: Re: LVB3900 J35A8 Flopro
Post by: Paul on September 05, 2021, 21:36:40 PM
Maybe contact these guys: http://boltshop.co.nz/. Their range is incredible - all sorts of weird stuff. Not cheap tho...
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 06, 2021, 06:55:09 AM
Thanks paul.  Good too know. 

Got a few more things hooked up

Title: Re: LVB3900 J35A8 Flopro
Post by: Jeff B on September 06, 2021, 11:16:59 AM
What's the theory on that angle for the oil filter?
Title: Re: LVB3900 J35A8 Flopro
Post by: Kakapo76 on September 06, 2021, 14:10:57 PM
Maybe to clear the exhaust? seems to lay the fittings back at the same angle as the dropper?  2c
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 06, 2021, 19:26:45 PM
Yup bang on kakapo.   Its so the hoses clear under the manifolds nicely.  Also allows more room for getting too the adjustable engine mount. 

Exhaust sorta done.  2 into 1 setup.    3inch into 4inch muffler can.   then itl go too one 3inch outlet. 
Title: Re: LVB3900 J35A8 Flopro
Post by: Kakapo76 on September 07, 2021, 21:33:34 PM
Looking really good- did you put any baffles in your muffler? I have an identical setup and found it quite loud- am wondering if mesh or more water is the answer?

Also all you J series guys out there- has anyone noticed any difference in the bell housing bolt patterns across different j30's/ J35's? Specifically, the 2 or 3 bolts on the left side of the housing (looking at it) where most of us are mounting the starter?
Title: Re: LVB3900 J35A8 Flopro
Post by: Jeff B on September 08, 2021, 05:26:33 AM
The j35a8 bellhousing is totally different to all the other J series. I believe the some j37 out of the awd vehicles (not sold new here anyway) is different also.
Not sure about the old family of j series, the conventional exhaust head models?
Title: Re: LVB3900 J35A8 Flopro
Post by: C dog on September 08, 2021, 07:15:14 AM
good progress with the build, the Honda v6 is looking like a nice setup. a wee bit off topic, do you know if the exhaust port off the J30's is the same as the Honda R18, I am thinking of using one in a build and the cast manifold looks like it could work maybe with a small adaptor plate. hopefully not too high.

Cheers
Title: Re: LVB3900 J35A8 Flopro
Post by: georgemcf on September 08, 2021, 07:18:41 AM
The j35a8 bellhousing is totally different to all the other J series. I believe the some j37 out of the awd vehicles (not sold new here anyway) is different also.
Not sure about the old family of j series, the conventional exhaust head models?

Can confirm j37a1 is the same bell housing as the j35a8
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 08, 2021, 07:27:28 AM
Na no baffles.  Ill try put the outlet on the muffler as close to the centre as possible (gives more time for both banks to evenly mix with water rather than having outlet on one side) and use rubber hose all the way from the can to transom outlet. Have done this on heeps of other setups and its worked real well. Quick and easy too build. 100mm alloy tube.  I might put a few baffles or a holey pipe in the transom outlet on this one for an experiment.

With the starter i havent really compared bellhouse patterns, Ive used a J30A5 starter on myne and theres not many places it can go that it can use a bellhouse hole for bolt.  The end of the J30 starter is quite long and anywhere else it hits on the engine block. 

Too be fair this engine is a total dick to marinise compared too a VQ35, theres much more work in it. But its shorter and lighter and they do sound a bit better for a v6
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 08, 2021, 07:31:19 AM
good progress with the build, the Honda v6 is looking like a nice setup. a wee bit off topic, do you know if the exhaust port off the J30's is the same as the Honda R18, I am thinking of using one in a build and the cast manifold looks like it could work maybe with a small adaptor plate. hopefully not too high.

Cheers

The aliart guy has these manifolds that are not drilled for the exhaust studs yet so you may be able to get on and drill it your self, also the J35z2 has a different exhaust port stud pattern too the j30and j35
Title: Re: LVB3900 J35A8 Flopro
Post by: Jeff B on September 08, 2021, 07:34:40 AM
good progress with the build, the Honda v6 is looking like a nice setup. a wee bit off topic, do you know if the exhaust port off the J30's is the same as the Honda R18, I am thinking of using one in a build and the cast manifold looks like it could work maybe with a small adaptor plate. hopefully not too high.

Cheers

I believe the R18 exhaust flange is slightly different,
I know the L15 4 cylinder is different for sure. I can check the R18 later on but Honda seems to make little differences between models, just enough to trip you up....
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 08, 2021, 07:42:06 AM
This video shows how loud or quiet it is.   Second boat has a 250x kawazaki in it.  First one is the Honda v6 J30.  Same setup muffler

https://youtu.be/fsEYvB_VfYc
Title: Re: LVB3900 J35A8 Flopro
Post by: C dog on September 08, 2021, 07:51:45 AM
Thanks Jeff b and JohnR

I was thinking of getting an undrilled manifold as the gaskets look similar but couldn't find any measurements online to confirm. I think I will order the engine and go from there. Cheers fellas
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 08, 2021, 07:53:25 AM
What unit is your r18 going on and what size hull? Mohawk has done a r18 and i think sean cooney has also
Title: Re: LVB3900 J35A8 Flopro
Post by: Kakapo76 on September 08, 2021, 11:33:47 AM
The j35a8 bellhousing is totally different to all the other J series. I believe the some j37 out of the awd vehicles (not sold new here anyway) is different also.
Not sure about the old family of j series, the conventional exhaust head models?

The interwebs seem to think that the 1998-2006 j series models share the same bell housing pattern across the range. Hoping this is accurate as it makes swapping parts lots easier.
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 08, 2021, 14:19:48 PM
Jeff is right.   They are different.  I just compared a j30a5 to the j35a8 and they different.  I have a j35z2 also that looks the same as the j35a8 bellhousing
Title: Re: LVB3900 J35A8 Flopro
Post by: C dog on September 08, 2021, 17:02:32 PM
What unit is your r18 going on and what size hull? Mohawk has done a r18 and i think sean cooney has also

I have had a good read through Mohawks build whick made it look like a good option, does Sean Cooney have a build thread? I have 2 options, just weighing up pros and cons, and what parts I have about. I plan on using a zjet hull, 3.2 with ski unit if I go for carbs, and 3.6 with colorado if I go for a turbo setup, plan on using a saco impellor for either option. I will put up a build thread. picking up the engine this weekend all going well. Sorry to hijack your thread. Cheers again.
Title: Re: LVB3900 J35A8 Flopro
Post by: Jeff B on September 08, 2021, 17:59:43 PM
Easiest option to check exhaust flanges is to get a gasket.
See pic the L15a compared to J30/35 they are quite different, I seem to remember the R18 somewhere between the 2?
I didn't know the v6 had different exhausts? All the ones I have done I used the same laser cut flanges, je0a4, j30a5, j35a8, j35z6 ??
Maybe John dropped engine and bent some studs, why exhaust doesn't fit?? ???
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 08, 2021, 18:08:15 PM
Haha.  Na the j35z2 defiantly has a wider exhaust stud pattern
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 08, 2021, 18:25:38 PM
I have had a good read through Mohawks build whick made it look like a good option, does Sean Cooney have a build thread? I have 2 options, just weighing up pros and cons, and what parts I have about. I plan on using a zjet hull, 3.2 with ski unit if I go for carbs, and 3.6 with colorado if I go for a turbo setup, plan on using a saco impellor for either option. I will put up a build thread. picking up the engine this weekend all going well. Sorry to hijack your thread. Cheers again.

Do option 1.  If ya do option 2 get more displacement. Eg K24 or J30a
Title: Re: LVB3900 J35A8 Flopro
Post by: Vlad on September 10, 2021, 02:14:31 AM

Hello, how much do these exhaust manifolds cost?
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 10, 2021, 07:28:28 AM
About $1500 plus gst and a bit more for powdercoated.  That was quite a few months back so possibly dearer now
Title: Re: LVB3900 J35A8 Flopro
Post by: Vlad on September 10, 2021, 18:50:43 PM
And then we make them welded, we want to try cast, from Ali-art.
Title: Re: LVB3900 J35A8 Flopro
Post by: Vlad on September 10, 2021, 18:59:57 PM
Hope it's a bug on their website?

https://www.peakmarine.co.nz/engine-parts-accessories/ali-art-manifold-chevv6
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 10, 2021, 20:20:51 PM
Theyr the same manifolds.  Just drilled different studs pattern.   
Title: Re: LVB3900 J35A8 Flopro
Post by: Vlad on September 10, 2021, 23:15:38 PM
Theyr the same manifolds.  Just drilled different studs pattern.

It is clear, but the diameter of the exhaust from the head there is suitable for the J - series?
Title: Re: LVB3900 J35A8 Flopro
Post by: Vlad on September 10, 2021, 23:55:39 PM
Guys, what do you put on your engine control unit, how does it work according to VTEC, does the valve turn on like on the stock ECU, or has the fuel map been rewritten in it and the valve turns on at the same rpm?
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 11, 2021, 07:16:29 AM
I run a link atom ecu, some run haltec, Vtec can be configured too come on how ever you like.  I set myne to come on at 4900rpm or 75percent tps  and over 70degrees engine coolant temp.  I found with a j30 ive done that bringing vtec on earler doesnt do much and thats about where it is configured to come on in a car
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 12, 2021, 07:58:16 AM
It is clear, but the diameter of the exhaust from the head there is suitable for the J - series?

Yup.  They fit good as gold
Title: Re: LVB3900 J35A8 Flopro
Post by: Vlad on September 13, 2021, 18:45:24 PM
Ок..
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on September 21, 2021, 10:29:04 AM
Lots of welding
Really rate the Topwell welders off alibaba, this will be the 4th hull welded up with it and 3rd trailer, was about 4k landed purchased early last year, put about 4-5x big rolls of alloy wire thru it.  Found that using 1.2mm wire is a must, with 3meter torch and graphite liner, way less birds nest compared too using 1mm wire.

I tried the 8 meter push pull torch that i purchased with it and it was poohs on 1mm wire.  Never tried it with 1.2mm wire with it,
I found the push pull gun was just too aquard, inconsistent and gumby to weld with, just binned it and made a crappy trolly out of an old engine stand so i can get the 3meter torch into hull and right up the nose. 
 
Migged most of trailer.  Tigged some parts

Title: Re: LVB3900 J35A8 Flopro
Post by: mohawk on October 08, 2021, 20:56:49 PM
I have had a good read through Mohawks build whick made it look like a good option, does Sean Cooney have a build thread? I have 2 options, just weighing up pros and cons, and what parts I have about. I plan on using a zjet hull, 3.2 with ski unit if I go for carbs, and 3.6 with colorado if I go for a turbo setup, plan on using a saco impellor for either option. I will put up a build thread. picking up the engine this weekend all going well. Sorry to hijack your thread. Cheers again.
Be carefull with you exhaust ... i had trouble with the motor sucking water back up the pipe at idle.. i moved the inlet down stream 3 times till it finally went away .. the l15 appears too have the same issue , probly due too cam overlap..
My suzuki was the same and had no issue ... my exhaust water was entering about 25 mm below the riser too start with , then i moved it 50 more , then 100 more down stream .. ....
Title: Re: LVB3900 J35A8 Flopro
Post by: cameronbezett on February 28, 2022, 21:18:31 PM
My j35a8 just arrived to replace my j30a1. What throttle body and tps are you using? Have most other parts worked out. Cheers
Title: Re: LVB3900 J35A8 Flopro
Post by: JohnR on February 28, 2022, 21:31:27 PM
70mm alibaba one and franklin performance tps adapter kit for 80mm throttle body fits.  Toyota tps in franklins kit