Anyone familiar with how our PCV system works??

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92ShoOff

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Hey everyone, I built a 3.3 motor using TotalSeal gapless rings and I've been having trouble with the motor since I've gotten it running. With only MAYBE 200 miles on the new motor I've lost about 2 quarts of oil. I just recently pulled my intake manifold, noticed oil in the intake runners, and on the tops of the valves. I've been getting a lot of good advice from everyone and today I went ahead and re-installed the intake manifold after doing a compression test and being suggested to keep driving it, but not driving it as hard as I've been to see if the rings start seating.

Well I'm gonna go that route and see if this oil burning issue doesn't clear up but I decided to call TotalSeal today to see if losing that much oil in those few miles is normal for break-in on their rings. The gentleman I spoke with seemed very knowledgeable about everything and suggested that my PCV system is possibly flowing too much. He asked if I had a PCV system, how it was routed, and asked if I noticed an oil in the runners. I told him about the oil in the runners, and that the PCV hose that goes from my the underside of my throttle body to the top of my block has oil all inside it.

He explained to me that the gapless rings create more vaccuum than standard rings, and that I need to find a way to restrict their air coming into the PCV system by maybe plugging the PCV system and drilling a smaller hole in the plug. Does anyone know anything about doing this? And where should I do this modification, on the hose between the throttle body and the top of the block?? He explained that what's happening with my oil is that it's being re-entered through the PCV system, into the intake manifold, and being burnt off in the combustion chamber. I don't have a clue how the PCV system work but that sounds like it's probably my problem, eh?

I have been having a strange noise coming somewhere from my intake manifold and/or runner, which doesn't start making noise until the engine gets hot. It then becomes RPM dependant, and to me the sound it's making sounds like some sort of vaccuum leak. I had previously been thinking that maybe one of my silicone intake runner couplers was leaking somewhere but now I'm wondering if this sound that I'm getting is possibly because there IS too much vaccuum in my PCV system and it's forcing it's way out somewhere. Is there anyone in here that could shed some light on all of this?

Much thanks,
Andrew Grayson
 
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SASHO91

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To restrict the air going into the block, put a restrictor on the VC-TB port... this only really helps a little.... this is the fresh air port...

Try spraying the motor with carb cleaner, and see if the idle jumps...

BTW, since your motor has gapless rings, you could run a vacuum pump and pick up some more HP, possibly 15...

here's a good discussion...
http://www.shoforum.com/showthread.php?t=69090
dont mind my alternative part...
 

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