Internal Combustion Engines
In order to eliminate knocking in compression ignition engines, there should be

Low compression ratio
High self ignition temperature of fuel
Late auto-ignition
Short delay period

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

Opens at 20° before top dead center and closes at 40° after bottom dead center
May open and close anywhere
Opens at top dead center and closes at bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center

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

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