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302/347 stroker choofing ??? 

 

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Posted: Tue Aug 05, 2008 6:15 pm 
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smoke?

 

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Posted: Tue Aug 05, 2008 10:32 pm 
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well I just installed a 3/8" phenolic spacer today and guess what!... my intake is oiled up nicely aswell.

 

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Posted: Wed Aug 06, 2008 12:18 pm 
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Spoke to my mechanic and apparently its a normal thing for it to happen as the vacuum made in the intake upon a sharp closure of the throttle from higher revs, can cause the engine to suck oil through the PCV into the intake. Catch can would normally fix it or a gausse filter on the PCV just to stop the oil. Also apparently this is a common problem with the BOSS engines.

 

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Posted: Wed Aug 06, 2008 2:49 pm 
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s-tranzor wrote:
Spoke to my mechanic and apparently its a normal thing for it to happen as the vacuum made in the intake upon a sharp closure of the throttle from higher revs, can cause the engine to suck oil through the PCV into the intake. Catch can would normally fix it or a gausse filter on the PCV just to stop the oil. Also apparently this is a common problem with the BOSS engines.

Would that be the same mechanic who built it?

 

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Posted: Wed Aug 06, 2008 3:36 pm 
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:roll:
well do people who think they know what they are on about around here agree with this or not?

 

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Posted: Wed Aug 06, 2008 5:56 pm 
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Basically they are correct that you will get oil vapours sucked into the intake from the PCV... It is best minimised by running a seperator tank (like a sealed breather tank) in line in the PCV hose.

 

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Posted: Wed Aug 06, 2008 6:00 pm 
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yeah, im actually getting one now as I think this explains a few of my recent issues. There is actually a lot of oil in my intake. We'll see how it goes.

How would you recommend cleaning the oil deposits out without removing the intake and flushing it? Carby cleaner as mentioned before?

 

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Posted: Wed Aug 06, 2008 6:09 pm 
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Well all carby cleaner will do is wash it down the intake and into the cylinders... Not really ideal IMO I'd either pull the intake or leave it alone, it isn't going to hurt anything.

 

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Posted: Wed Aug 06, 2008 6:27 pm 
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yeah but it would just burn out the exhaust if you washed it down. Plus it would be in the inlet ports in the heads too those will definitely not be removed hehe. I suppose once you stem the flow it would flush through over time yeah?

 

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 Post subject: Re: 302/347 stroker choofing ???
Posted: Wed Aug 06, 2008 6:52 pm 
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MASON wrote:
ive recently had my 302 windsor stroked to 347 with head work and cam.
it has some choofing out of the oil filler cap when i take it off and oil in the intake manifold when i took it of. some people have suggested catch cans?? could the problem be something else??



If there is a blowby problem it may show up with some of the spark plugs being oily.I'd suggest cleaning out the intake and after a few hundred km's checking the spark plugs.

I've encountered the same problem with mine and I have been using a catch can.I've also considered that the rings have'nt beded in properly but have never found the plugs to be oily.Hope this helps.

 

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Posted: Wed Aug 06, 2008 7:05 pm 
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^^^Nice. I'll defo be getting a catch can then :)

 

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Posted: Wed Aug 06, 2008 7:25 pm 
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I could be wrong but i'm trying to sort this problem out as well.I'd hate to take the motor out and strip it down if it is'nt a ring problem.Try the catch can and see how you go.

 

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Posted: Wed Aug 06, 2008 7:29 pm 
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how would ring problems cause this though?

 

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Posted: Wed Aug 20, 2008 8:48 pm 
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yeah i does sound right but i cant explain the 70% leakage in the cyclenders.
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Posted: Wed Aug 20, 2008 9:52 pm 
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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..

 

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