Pcv Valve

Some articles on pcv valve, pcv:

Crankcase Ventilation System - Components and Details
... The PCV valve is only one part of the PCV system, which is essentially a variable and calibrated air leak, whereby the engine returns its crankcase combustion gases ... The PCV system is not a classical "vacuum leak" ... The PCV system just diverts a small percentage of this air via the breather to the crankcase before allowing it to be drawn back in to the intake tract again ...