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In crankcase scavenging , the crank case compression of air (in c.i engine)or air fuel mixture (in s.i engine) accrues in the crank case.The medium is introduced at atmospheric pr. into the space below the piston through a one way valve.The power stroke of the piston compresses the medium as well as pushed the compressed medium through a inlet port into the combustion chamber.

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Q: What is the working principle of crankcase scavenged two stroke engine?
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