What are the two types of crankcase ventilation methods?

[DelTravis]

Crankcase ventilation methods can be divided into two types, as detailed below: 1. Closed-loop forced ventilation type: This method directs the exhaust gases from the crankcase into the intake pipe for reuse. 2. Pressure balance type: The ventilation port directly discharges the exhaust gases into the atmosphere. Additional information: 1. Reasons for crankcase ventilation: Due to the leakage of combustible mixture and exhaust gases into the crankcase, the pressure inside the crankcase increases, causing engine oil to seep out and be lost through the crankshaft oil seals and crankcase gaskets. The oil vapor escaping into the atmosphere increases the engine's pollution of the environment. 2. Precautions: If the crankcase ventilation system fails to function properly, immediate repairs should be carried out. Otherwise, excessive pressure inside the engine can cause damage. The crankcase ventilation system is equipped with an oil-gas separator, which is used to separate the oil vapor inside the crankcase.