Quote:
Originally Posted by gmsii
place a check valve between intake manifold and catch can? the manifold will see vacuum and boost (on FI setups)...install the check valve one way and you will have a vacuum leak, install it the other way and you will have a boost leak. if you insist on connecting the intake manifold to the catch can, what you needs is a zero-way valve. some call it a plug
or am i misunderstanding something?
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Huh? A check valve is a one way valve. In this application it will stop pressure/air from exiting the manifold and entering the catch can. You only want air from the crank case / PCV to flow towards the manifold. You don't want boost flowing to the crank case / PCV