Internal Combustion Engines
Scavenging air in diesel engine means

Forced air for cooling cylinder
Air used for combustion sent under pressure
Air used for forcing burnt gases out of engine's cylinder during the exhaust period
Burnt air containing products of combustion

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Internal Combustion Engines
For the same compression ratio

Compression ratio has nothing to do with efficiency
Otto cycle is more efficient than the Diesel
Diesel cycle is more efficient than Otto
Both Otto and Diesel cycles are, equally efficient

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