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

May open or close anywhere
Opens at 20° after top dead center and closes at 20° before bottom dead center
Opens at top dead center and closes at bottom dead center
Opens at 20° before top dead center and closes at 40° after bottom dead center

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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
Both Otto and Diesel cycles are, equally efficient
Diesel cycle is more efficient than Otto

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