What is the function of the PCV valve in an engine?

The function of the PCV (Positive Crankcase Ventilation) valve in an engine is to regulate the flow of gases from the crankcase back into the combustion chamber. This is an essential component in modern internal combustion engines. It helps in managing the pressure within the crankcase and reduces the buildup of harmful gases, such as hydrocarbons and moisture, that can occur during the combustion process.

When the engine runs, combustion gases can escape into the crankcase due to piston blow-by. The PCV valve allows these gases to be rerouted back into the intake manifold and mixed with the incoming air-fuel mixture. This not only prevents oil contamination but also allows these gases to be burned off during the combustion process, enhancing efficiency and minimizing emissions.

By controlling the flow of these gases, the PCV system plays a critical role in engine performance, reducing pollution, and contributing to better fuel economy. Hence, the function described is pivotal to the effective operation of an internal combustion engine.