Quote:
Originally Posted by King Tut
What factory check valve are you talking about? Can you please take a picture of it? Can you describe this testing procedure you performed? There is no check valve in the PCV system on this car. That hose running off the back of the intake manifold and into the crankcase on the passenger side is being pressureized and is pressurizing the crankcase without a check valve installed. We aren't worried about leaking or losing boost, we are worried about presurizing an area of the engine that wasn't meant to see pressure.
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by definition...a 'PCV' system is going to have check valves in it
anytime a hose goes from the block to a part that sees vacuum there need to be a check valve in place (ie the brake booster of the manifold)
on the FA20 engine there are three hoses...one goes to the brake booster, one goes to the manifold, and one goes to intake tube before the throttle body. the hose connected to the brake booster and manifold need and have check valves in the place. for the hose that goes to the manifold, the check valve is in screwed into the block (so some people might not think there is a check valve in place)....that is the part we tested. we tested it on a bench where we pressurized the outlet side until the valve started to leak, and then measured the amount of leakage which proved to be minimal at all pressure levels from 7psi to 90psi.
the net-net is that you arent going to pressurize the block in any manner that should be of concern with the factory valves in place; unless you hook up the third line which was meant to vent to atomosphere to a part of the system that is seeing boost. That third should be hooked up to the non-pressurized intake tube (before the compressor)
hope this makes things a bit more clear