Quote:
Originally Posted by cjperformance
There should be a check valve already on the line that goes to the intake. In my mind it should allow air to pass from the catch can to the intake, but close under boost and not allow air to pass from intake to catch can.
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I can't see the pictures here at work, but I don't recall seeing a check valve on other installations. I believe cj may be referring to the PCV valve, which operates a little differently. A check valve blocks flow in one direction. The PCV valve blocks flow in one direction, and meters flow in the opposite direction. The below diagram uses arrows to show the relative flow rates.