Internal Combustion Engines
Supercharging is the process of

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

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Internal Combustion Engines
In a four stroke cycle petrol engine, the expansion

May start and end anywhere
Starts at 30° after top dead center and ends at 50° after bottom dead center
Starts at top dead center and ends at bottom dead center
Starts at 30° before top dead center and ends at 50° before bottom dead center

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