Hello, I am working with a B18c1 head/ B18a1 block. The connection between the air intake tube and the valve cover provides "fresh" air into the head to force or replace oily air leaving the engine through the PCV.
When will the pressure inside build to the point the "bad" air tries to go back up the tube and into the air intake?
I am not refferring to the normal oily air that goes into the intake manifold to get re-burned. I am concerned with the hose from the valve cover/ air intake tube.
I want to know if it is useful to put a one way check valve in the tube to prevent the "bad" air from trying to go back up into the intake tube? Maybe use a "Y" connection right at the valve cover nipple - good air can come in but bad air is shunted to one of those little stand alone filters??
Does this idea have any value? I will have an oil catch can between the PCV and the I.M. return, so I am thinking all "bad" air should be annhilated.
Thanks. RFT