oil in bottom intercooler pipe
12-29-2012, 09:45 AM
#21
AudiWorld Super User
Yep your right not vac operated
Vacuum controls the valve. A spring keeps it open until vac overcomes the spring/whatever it. This prevents too much vacuum in the CC, but allows ventilation of BB gasses back to the intake.
Actually, its not vacuum per se but *pressure differential* between the two chambers.
The theory can't change although each motor's implementation of course will.
They sure do make something simple sound complicated though. I suppose that justifies a high price :-)
Grant
Actually, its not vacuum per se but *pressure differential* between the two chambers.
The theory can't change although each motor's implementation of course will.
They sure do make something simple sound complicated though. I suppose that justifies a high price :-)
Grant
12-29-2012, 11:50 AM
#22
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well, it is and it isn't.
It has a spring to keep it open under some conditions, but the basic action of every PCV valve is to shut under high vacuum (or, more precisely, *differential* vacuum, meaning net vacuum of (manifold - crankcase)) or we'd just have a hose. In general you don't require a special vacuum connection - it simply works based on one side having more vacuum than the other, and thus pushing the ball or flapper shut.
Problem with a hose is that you'd get periods of high crankcase vacuum.
Grant
It has a spring to keep it open under some conditions, but the basic action of every PCV valve is to shut under high vacuum (or, more precisely, *differential* vacuum, meaning net vacuum of (manifold - crankcase)) or we'd just have a hose. In general you don't require a special vacuum connection - it simply works based on one side having more vacuum than the other, and thus pushing the ball or flapper shut.
Problem with a hose is that you'd get periods of high crankcase vacuum.
Grant
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I found oil in my Intercooler pipe, could it be from oil changes dripping all over and seeping in???
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