Internal Combustion Engines
For the same compression ratio

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

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Internal Combustion Engines
In a four stroke cycle diesel engine, the compression

Starts at top dead center and ends at 40° before bottom dead center
Starts at 40° after bottom dead center and ends at 10° before top dead center
May start and end anywhere
Starts at 40° before top dead center and ends at 40° after top dead center

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