Ten Pow Repairs

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What does the PCV valve do?
Definition & Description
A PCV Valve regulates positive crankcase ventilation. It is an important part of your Crankcase Ventilation System.

What does it do?
The PCV valve serves a few purposes:

It stops excessive amounts of oil from being drawn out of the crankcase.
It regulates the amount of Vacuum applied to the crankcase.
At low rpm, when vacuum is high, the valve closes slightly to reduce airflow.
At higher rpm, when vacuum is less, the valve opens more to increase airflow.
It acts as a 1-way check valve for forced induction or a backfire. It won't allow the crankcase to be pressurized.
A diagram of a PCV valve working at low rpm, high rpm, and a backfire.

How does it affect performance?
The PCV valve controls your PCV System. Follow your maintenance schedule and make sure the valve and The PCV Hoses stay clean and clear. This will extend the life of your oil and the engine itself.

The PCV system also helps the engine make a little more power. The slight vacuum in the crankcase improves the seal of the piston rings and valve stems. This keeps the compression in the chamber, where we want it. A PCV system also reduces windage and oil aeration. These cause drag on the rotating assembly and rob you of some power.

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