Internal Combustion Engines
For maximum power generation, the air fuel ratio for a petrol engine for vehicles, is of the order of

0.50069444444444
0.37569444444444
0.75069444444444
0.62569444444444

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Internal Combustion Engines
In a four 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 40° after bottom dead center
Opens at 20° after top dead center and closes at 20° before bottom dead center
May open and close anywhere

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