Why Does the Crankcase Need Ventilation?

[Percy]

If the crankcase is not ventilated, it will cause excessive pressure inside the crankcase, which can affect the downward movement of the pistons and compromise the sealing performance of the crankcase. Therefore, crankcase ventilation is necessary. More details about the crankcase are as follows: 1. The car's engine has a power stroke, during which some of the high-pressure gases in the combustion chamber enter the crankcase through the piston rings. 2. If the exhaust gases in the crankcase are directly released into the atmosphere, it would pollute the air. Hence, the engine is equipped with a dedicated crankcase ventilation system. This system directs the exhaust gases from the crankcase into the intake manifold, allowing them to re-enter the combustion chamber for further combustion. 3. Another important component in the forced crankcase ventilation system of a car engine is the oil separator. The oil separator's function is to separate oil vapors. If the oil vapors are not separated, they will also enter the combustion chamber and participate in combustion, leading to severe carbon buildup in the engine and causing the engine to burn oil.