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

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

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Internal Combustion Engines
In a typical medium speed, 4-stroke cycle diesel engine

May start and end anywhere
Fuel injection starts at 10° before top dead center and ends at 20° after top dead center
Fuel injection starts at just before top dead center and ends just after top dead center
Fuel injection starts at top dead center and ends at 20° after top dead center

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