Internal Combustion Engines
The basic requirement of a good combustion chamber is

Low compression ratio
Low volumetric efficiency
Minimum turbulence
High thermal efficiency and power output

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

Opens at 30° before bottom dead centre and closes at 10° after top dead centre
May open and close anywhere
Opens at 30° after bottom dead centre and closes at 10° before top dead centre
Opens at bottom dead centre and closes at top dead centre

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Internal Combustion Engines
For the same compression ratio

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

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