During combustion of oil in combustion chamber there is possibility of acid formation due to sulphur present in the fuel which cause corrosion to engine parts e.g. cylinder walls, piston pins and gear etc.
To avoid this flow of air is carried through engine crankcase which causes the combustion products in the form of vapour to vapourise outside. This process is called crankcase ventilation.
Method of crankcase ventilations:
1. Road draft
2. Manifold suction system.
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