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

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

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Internal Combustion Engines
Supercharging is the process of

Supplying compressed air to remove combustion products fully
Providing forced cooling air
Injecting excess fuel for raising more loads
Supplying the intake of an engine with air at a density greater than the density of the surrounding atmosphere

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