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

Opens at 15° after top dead center and closes at 20° before bottom dead center
Opens at 15° before top dead center and closes at 20° after top dead center
Opens at top dead center and closes at bottom dead center
May open and close anywhere

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

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
Starts at bottom dead centre and ends at top dead centre
May start and end anywhere

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