Internal Combustion Engines
The delay period in compression ignition engines depends upon

Nature of the fuel mixture strength
All of these
Relative velocity between the fuel injection and air turbulence pressure of residual gases
Temperature and pressure in the cylinder at the time of injection

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

Starts at top dead center and ends at 40° before bottom dead center
Starts at 40° before top dead center and ends at 40° after top 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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