An internal combustion engine,this is the process of removal of exhaust gas from the cylinder after combustion and and replenishment with air for subsequent combustion.

The terms scavenging is used to describe the process of ridding the cylinder of burned exhaust gases at the end of expansion stroke and early part of compression stroke.

Efficient scavenging is necessary for good combustion and it is required for replacing the exhaust gas. The scavenge air also assists cooling of cylinder, Piston, cylinder head, exhaust valve etc.


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