Internal Combustion Engines
In a four stroke cycle engine, the sequence of operations is

Suction, expansion, compression and exhaust
Expansion, compression, suction and exhaust
Compression, expansion, suction and exhaust
Suction, compression, expansion and exhaust

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Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engine the inlet valve

Opens at top dead center and closes at bottom dead center
Opens at 20° before top dead center and closes at 35° after the bottom dead center
Opens at 10° after top dead center and closes 20° before the bottom dead center
May open or close anywhere

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