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Author Topic: J30a V6 Bike Carby Engine Build  (Read 36092 times)

Offline Markg

  • Website Member
  • Posts: 274
Re: J30a V6 Bike Carby Engine Build
« Reply #270 on: February 14, 2021, 18:43:20 PM »
Quote from: Ross Goldsack - JBNZ President on February 14, 2021, 09:17:28 AM
Thats a bummer  C""
But this is where you see the benefit of running a cheap automotive engine, 1 day in the shed and you will be back on the river.
If your South Island wreckers are too much of a rip off I have a j30 you can have? Freight will cost a bit tho.
I agree with Jeff, detonation likely cause......
Do you have an oil cooler? 90?c is pretty cool unless you were just cruising along.
1 day to put a new motor in and three days to clean up all the oil and engine shrapnel in the engine bay!!!!
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Offline mohawk

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  • JMS 4.3mtr , LS 1, 752.
Re: J30a V6 Bike Carby Engine Build
« Reply #271 on: February 14, 2021, 19:53:34 PM »
Quote from: Markg on February 14, 2021, 18:43:20 PM
1 day to put a new motor in and three days to clean up all the oil and engine shrapnel in the engine bay!!!!
Clean ???   whats that meen  ???
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Life is tough ....... Even tougher if your stupid....

Offline Kakapo76

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  • Posts: 548
Re: J30a V6 Bike Carby Engine Build
« Reply #272 on: February 14, 2021, 23:01:36 PM »
Thanks, Guys for all the support and advice- I know this forum has limited scope these days but it's still got some great contributors and I really appreciate the advice, knowledge and talent on display.

I am pretty sure John is on the money regarding AFR's- I did have a hot cylinder last weekend when the vtec was engaged and all of a sudden the jetting was too lean and unfortunately, I did not have a working wideband so missed the warning signs, I will pull the motor down, but am expecting to find a pinched cylinder and scored sleeve- pics to come.

If anyone has a cheap a30a1 block they want to sell me then please pm me and let's talk, failing that I will put the j30a4 I have in the garage but that means a new exhaust system and more money to be spent- management (my wife) is not that happy currently so careful treading is the order of the day :-)

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Offline Kakapo76

  • Website Member
  • Posts: 548
Re: J30a V6 Bike Carby Engine Build
« Reply #273 on: February 14, 2021, 23:11:12 PM »
Quote from: Warwick Marflitt on February 14, 2021, 01:34:31 AM
Can vvt increase airflow beyond the carburetor jets or fuel pumps ability to supply enough fuel? The joys of experimental  fl. development aren't without challenge....

This- everything else stayed the same, think its a jetting issue based on 2 more valves per cylinder opening and the mixtures leaning out.
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Offline Jeff B

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Re: J30a V6 Bike Carby Engine Build
« Reply #274 on: February 15, 2021, 07:52:40 AM »
I can't believe you tuned it (sort of) without a wideband.
When I am way off or something goes wrong the wideband goes off the scale lean (17:1) before it misses and loses power. Same as rich, it's at 10:1 when I can notice it...
Another thing to consider is oil pressure and v tec engagement.
It sucks up a fair bit of oil to engage. I had a L15a with the same puttz vtec that I hard wired so was permanently on but at idle it didn't quite have enough oil pressure to hold vtec in and it would pop out occasionally at idle. There is an additional oil pressure sender by the vtec solenoid and in the car, the ecu wont engage vtec if oil pressure is too low.
When you were mucking around with your window switch possibly it could have starved engine of oil? Not likely but worth looking into?
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Offline Ross Goldsack - JBNZ Immediate Past President

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Re: J30a V6 Bike Carby Engine Build
« Reply #275 on: February 15, 2021, 09:37:18 AM »
That V Tec robbing oil idea is worth looking into. If the oil level is allowed to get low on my K24 the oil pressure noticeably drops when V Tec engages, but if oil level is higher it doesn't.....I know that is weird. I have that engine standing vertical and not lent over as it is in the car, so calculating the correct level is a bit tricky.
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Offline Kakapo76

  • Website Member
  • Posts: 548
Re: J30a V6 Bike Carby Engine Build
« Reply #276 on: February 15, 2021, 10:01:37 AM »
Quote from: Jeff B on February 15, 2021, 07:52:40 AM
I can't believe you tuned it (sort of) without a wideband.
When I am way off or something goes wrong the wideband goes off the scale lean (17:1) before it misses and loses power. Same as rich, it's at 10:1 when I can notice it...
Another thing to consider is oil pressure and v tec engagement.
It sucks up a fair bit of oil to engage. I had a L15a with the same puttz vtec that I hard wired so was permanently on but at idle it didn't quite have enough oil pressure to hold vtec in and it would pop out occasionally at idle. There is an additional oil pressure sender by the vtec solenoid and in the car, the ecu wont engage vtec if oil pressure is too low.
When you were mucking around with your window switch possibly it could have starved engine of oil? Not likely but worth looking into?

In my defence I was running rich prior to opening up the vtec- I had been tuning with the wideband, it was working then it got wet, installed a different brand (AEM not Innovate) and it was working showing 13.5 which isn't lean in fact for NA bang on the money- never felt a miss and it was running great- I still think its a combination of factors- loss of oil to the big end, I am also noticing oil pooling in the heads because of engine angle so am wondering if I  am pumping a lot up of oil into the heads and it's reducing the sump volume, thus starving the pickup, add this to the vtec needs I simply may not have had enough in the system- I am running a remote oil cooler- pretty sure its plumbed correctly (in through the filter center- out through the side and then through the HE and back to the block. If I was running super lean then I am sure I will see evidence of it across more than one cylinder.
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Offline Warwick Marflitt

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Re: J30a V6 Bike Carby Engine Build
« Reply #277 on: February 15, 2021, 13:19:04 PM »
Uncle had a Datsun Rally car with a 13B rotary. He added xtra ports made a manifold and a 3rd carburetor that came in at higher rpm.... It was his way to add extra fuel. A V6 with  12 carbs might be a bit of a Knights Mare!!!
SO... 00.t..... It may be time.....to run.............. a factory EFI system.. cou
You'll  fl. $ell them loud barking carbs, linkages, dizzy, fuel pumps etc! Ewe'll sh get to keep the memories and experience OoOoO as well as pictures and forum post B))T B))T B))T and you'll probably have >>@ just enough for an ecu tune..? And a Rose with a box of chocolates for she hhh who must!!! be obeyed..... c0H Then it'll be boring lame quiet EFI  jet boating.....NAGH!!!! put a Quad rotary in it with a big Cam an roller rockers with a stroker crank sum Nitro fog injection and really get it(DIVORCE)moving..... st st st Ha A rotor with a cam....

Creativity is intelligence having fun. -Einstein         

* air boat.jpg (101.55 kB, 576x324 - viewed 477 times.)
« Last Edit: February 15, 2021, 15:12:46 PM by Warwick Marflitt »
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Warwick Marflitt
HJ53 752 Holden 3.8 V6 FloPro 19&17Deg Impellers

Offline JohnR

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Re: J30a V6 Bike Carby Engine Build
« Reply #278 on: February 15, 2021, 21:28:17 PM »
Quote from: Kakapo76 on February 15, 2021, 10:01:37 AM
In my defence I was running rich prior to opening up the vtec- I had been tuning with the wideband, it was working then it got wet, installed a different brand (AEM not Innovate) and it was working showing 13.5 which isn't lean in fact for NA bang on the money- never felt a miss and it was running great- I still think its a combination of factors- loss of oil to the big end, I am also noticing oil pooling in the heads because of engine angle so am wondering if I  am pumping a lot up of oil into the heads and it's reducing the sump volume, thus starving the pickup, add this to the vtec needs I simply may not have had enough in the system- I am running a remote oil cooler- pretty sure its plumbed correctly (in through the filter center- out through the side and then through the HE and back to the block. If I was running super lean then I am sure I will see evidence of it across more than one cylinder.

13.5 is too lean at wot. 12.5 would be better
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Offline mohawk

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  • JMS 4.3mtr , LS 1, 752.
Re: J30a V6 Bike Carby Engine Build
« Reply #279 on: February 16, 2021, 19:36:00 PM »
Quote from: JohnR on February 15, 2021, 21:28:17 PM
13.5 is too lean at wot. 12.5 would be better
i think that dates back too rovers and 308s john ... most shoot for low 13s now days i think
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Offline JohnR

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Re: J30a V6 Bike Carby Engine Build
« Reply #280 on: February 17, 2021, 09:03:41 AM »
Mmm.  Would you run a ls engine at 13.5 afr wot.  I wouldnt.
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Offline Jeff B

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  • Posts: 5178
Re: J30a V6 Bike Carby Engine Build
« Reply #281 on: February 17, 2021, 09:05:59 AM »
Quote from: JohnR on February 17, 2021, 09:03:41 AM
Mmm.  Would you run a ls engine at 13.5 afr wot.  I wouldnt.
LS1 needs a bit more fuel than high performance, high tolerance, high efficiency japanese made engines  ;)
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Offline Kakapo76

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  • Posts: 548
Re: J30a V6 Bike Carby Engine Build
« Reply #282 on: March 23, 2021, 11:06:04 AM »
Good morning all, apologies for the silence, but life. Anyways I am about to put in a j35a? (think its a3 could be a 1) that I picked up in Christchurch- it's much easier to install this engine than muck about with a whole new exhaust. I am currently altering the sump to shift the pickup to the rear and then it's ready to try again.

I had a thought about actually putting this engine on a dyno- I seem to remember that someone in Christchurch used to have a jet unit attachment for their hub dyno? Does anyone recall who and out of curiosity has anyone tried to tune an engine with it?
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Offline Warwick Marflitt

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Re: J30a V6 Bike Carby Engine Build
« Reply #283 on: March 23, 2021, 21:16:56 PM »
Here's a list of shops

https://dynoseek.co.nz/performance-workshops/christchurch
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Warwick Marflitt
HJ53 752 Holden 3.8 V6 FloPro 19&17Deg Impellers

Offline georgemcf

  • Website Member
  • Posts: 36
Re: J30a V6 Bike Carby Engine Build
« Reply #284 on: March 24, 2021, 21:36:11 PM »
Quote from: Kakapo76 on March 23, 2021, 11:06:04 AM
Good morning all, apologies for the silence, but life. Anyways I am about to put in a j35a? (think its a3 could be a 1) that I picked up in Christchurch- it's much easier to install this engine than muck about with a whole new exhaust. I am currently altering the sump to shift the pickup to the rear and then it's ready to try again.

I had a thought about actually putting this engine on a dyno- I seem to remember that someone in Christchurch used to have a jet unit attachment for their hub dyno? Does anyone recall who and out of curiosity has anyone tried to tune an engine with it?

NZEFI used to have one, but they don't really use their dyno anymore I believe. More into playing with electric cars...
Kirk McLaren down at AVR Performance in Ashburton does quite a few though, he does a bit of testing for Scott and their suzuki setups etc.

Am interested in the figures and chart of the j35
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