adallak Posted June 25, 2012 Report Share Posted June 25, 2012 While I am waiting for an PCV elbow and grommet to replace the dried out ones, I have checked a new Puralator PCV valve I ordered some time ago. When I blew on it, it flows freely one way like it should, but when I turn it around and blow the other way, it doesnt seal COMPLETELY... If I push the valve with a finger while still blowing to make it sit properly, it seals COMPLETELY. The problem is that there will be nobody in the engine to push the valve until it seals completely... The PCV valve is made in the USA, if that matters. Should I get an OEM part, or it will do the same thing? The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
cdgrinci Posted June 25, 2012 Report Share Posted June 25, 2012 I remember it operating as you describe (complete restriction is never realized). Here is a portion of explanation: At idle, the intake manifold vacuum is near maximum. It is at this time the least amount of blow by is actually occurring, so the PCV valve provides the largest amount of (but not complete) restriction. As engine load increases, vacuum on the valve decreases proportionally and blow by increases proportionally. With a lower level of vacuum, the spring returns the cone to the "open" position to allow more air flow. At full throttle, vacuum is much reduced, down to between 1.5 and 3" Hg. At this point the PCV valve is nearly useless, and most combustion gases escape via the "breather tube" where they are then drawn in to the engine's intake manifold anyway. Chuck '19 CT6, '04 Bravada........but still lusting for that '69 Z-28 Link to comment Share on other sites More sharing options...
adallak Posted June 25, 2012 Author Report Share Posted June 25, 2012 C&C, Thank you. Looks like the valve is not defective as long as it rattles freely. Here are a couple of related links: http://www.google.co...,r:11,s:0,i:113 http://www.dummies.c...-pcv-valve.html The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
Safari2000 Posted June 28, 2012 Report Share Posted June 28, 2012 As long as it moves freely PVC is good, only when they get gummed up do they refuse to work. Link to comment Share on other sites More sharing options...
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