Internal Combustion Engines
The reason for supercharging in any engine is to

Increase power
Effect fuel economy
Reduce weight and bulk for a given output
Increase efficiency

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

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

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Internal Combustion Engines
The expansion of fuel in a four stroke cycle diesel engine

Starts at 15° after top dead center and ends at 30° before bottom dead center
May start and end anywhere
Starts at 15° before top dead center and ends at 30° after top dead center
Starts at top dead center and ends at 30° after top dead center

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