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302/347 stroker choofing ??? 

 

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Posted: Wed Aug 20, 2008 10:00 pm 
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the 70% leakage is only in 2 cyclnders could it still be the same problem
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Posted: Thu Aug 21, 2008 10:55 am 
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EBXR8380 wrote:
Blowby is caused by rings not sealing properly...
Try retarding timing a little till it settles down, or check timing / tune ??
Raising the pcv away from manifold / rocker cover can help also..
I have fitted an alloy tube with two baffles welded inside.. Virtually an inline oil separator..


What are long term effect or this? Will they seal properly over time as they wear in? my 347 is 5000km old and doing this to a certain degree.

 

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Posted: Thu Aug 21, 2008 11:00 am 
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With an engine with only 1000k's on it a major difference between cylinders isn't goin to fix itself. If your engine builder has considered pulling the heads he knows theres a problem and that engine is comin back out.
The reason people run vacumm pumps on the bigger horsepower engines is to pull the vacumm out of the sump to remove the PARACHUTE effect on the pistons with a perfect ring seal imagine just how much air is being pumped in the sump so without a perfect ring seal you are pumpin compression into the sump also.
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Posted: Wed Oct 15, 2008 9:47 am 
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the heads have been taken off and there is major detonation in cylender 3. its said to be a tuning problem.
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Posted: Wed Oct 15, 2008 11:29 am 
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did it ping it's nuts off much?

 

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Posted: Wed Oct 15, 2008 7:59 pm 
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when i over took it made really noticable vibrations. i dunno if it was something else but other wise i didnt really get the chance to drive it hard, as it stuffed up straight away i didnt want to make things worse.
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Posted: Wed Oct 15, 2008 10:14 pm 
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MASON wrote:
the heads have been taken off and there is major detonation in cylender 3. its said to be a tuning problem.

So what was the damage in cylinder 3 that was caused by detonation?
Cracked piston, broken rings,broken ring land,damaged head?

 

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Posted: Wed Oct 15, 2008 10:28 pm 
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A proper rebuild wont breathe like that. Stroke has nothing to do with it. Either you belted it before it was run in or it has ring to bore dramas, my bet is its glazed. It`ll have to be pulled down again if its chewing oil. :D

 

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Posted: Wed Oct 15, 2008 10:31 pm 
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who did u get to tune it?....people always love to lean motors out too far just to get that final 5% but forget that there is a reason why most factory tunes run super rich, that reason is durability / longevity.. id rather go a bit slower than have to fork out for another rebuild shortly down the track

oh well say goodby to $5000 or however much it cost :( at least you should be able to salvage most parts

 

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Posted: Thu Oct 16, 2008 2:08 am 
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can do just as much damage running too rich with a motor.


Could've been a blocked/faulty injector, especially if one cylinder has copped all the damage.

 

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Posted: Thu Oct 16, 2008 6:02 am 
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Detonation will kill rings. Killed rings = unlimited blowby or 'choofing' as commonly referred to in this thread. Probably blows a bit of smoke too.

 

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Posted: Thu Oct 16, 2008 6:06 pm 
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schnoods wrote:
can do just as much damage running too rich with a motor.


Could've been a blocked/faulty injector, especially if one cylinder has copped all the damage.


yeah ive seen u say that before, how rich are u talking? factory r33 gts runs up to 10:1...so nissan HQ dont think its gunna cause any damage running rich

detonation / heat kills engines - rich mixtures keep things nice and cool

 

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Posted: Thu Oct 16, 2008 6:17 pm 
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Running to rich is what causes the bores to glaze on initial bed in. Also bad for the environment
Brett

 

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Posted: Thu Oct 16, 2008 6:22 pm 
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On run in you need a lean condition.. But it sounds like it wasn't pre tuned very well!!
strokers generally have higher compression!!
I would have had static timing set to 4 to 6 * until tunes or set properly!!
Sounds like atleast one piston and new set of rings..
The end gap may not have been big enough also and broken rings..
Oil in inlet is bad for detonation also...
12.7 is ok tune for intial start up..
As said IT WON'T get any better!!
It needs pulling down and assembling again !!
double check compression.. It could be quite high ..

 

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Last edited by EBXR8380 on Thu Oct 16, 2008 6:26 pm, edited 1 time in total.

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Posted: Thu Oct 16, 2008 6:23 pm 
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EBXR8380 wrote:
On run in you need a lean condition.. But it sounds like it wasn't pre tuned very well!!
strokers generally have higher compression!!
I would have had static timing set to 4 to 6 * until tunes or set properly!!
Sounds like atleast one piston and new set of rings..
The end gap may not have been big enough also and broken rings..
Oil in inlet is bad for detonation also...
12.7 is ok tune for intial start up..
As said IT WON'T get any better!!
It needs pulling down and assembling again !!
double check compression.. It could be quite high ..

 

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