Bolw By ???

Moper, at wide open throttle an engine has zero vacuum. Vapor can't be drawn into the intake without vacuum. When a pcv valve is at rest it is closed with a light spring and if the breather on the other valve cover can't handle the crankcase presssure it will push this spring open and send pressure thru the pcv valve. But it is not drawn in by the engine running it is pushed in by the pressure.


Chuck