stage of scavenging:-

1.blow down period:-sudden opening of exhaust ports and valves accelerates exhaust gases to exhaust menifold.

 2.Scavenging periods:-scavenge port opens supercharge air enters and sweeps exhaust gas out, Scavenger air box pressure must be sufficiently higher than the atmospheric pressure.

3.air retain periods:-scavenge port,still exhaust valve/port in open condition some air loss through exhaust opening,then compression starts after exhaust closing


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