Internal Combustion Engines
Diesel engine can work on very lean air fuel ratio of the order of 30: 1. A petrol engine can also work on such a lean ratio provided

It is properly designed
Cannot work as it is impossible
Flywheel size is proper
Best quality fuel is used

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

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