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Great, you have admitted a zero net pressure differential from piston movment, AND a postive pressure differential from blow-by ( with a disclaimer that if the PCV cannot handle it, then you need a...

About the sealed cap: You said "You do not want to run a sealed cap on most applications" Is this statement made in refrence to performance engines only? Perhaps because a performance engine...

cool. Thanks for straightening me out.

one question: Don't most cars COME with a sealed cap?


But I would point out.. when one piston is going down, is not another going up?

Thanks for...

Cool, let's see if we can straighten it out:

PCV = positive crankcase ventilation. The main function of the PCV itself is a check valve, which will prevent a backfire from entering the engine. ...

since it ran better with the hole not plugged, a breather cap would give you more air and help it out that way. ( since it likes it like that ). Otherwise, a closed system gives you vacuum in the...