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

May start and end anywhere
Starts at bottom dead centre and ends at top dead centre
Starts at 40° after bottom dead centre and ends at 30° before top dead centre
Starts at 40° before bottom dead centre and ends at 30° after bottom dead centre

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Internal Combustion Engines
For the same compression ratio

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

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