Internal Combustion Engines
Supercharging is the process of

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

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Internal Combustion Engines
In a typical medium speed 4-stroke cycle diesel engines

Exhaust valve opens just after bottom dead center and closes just before top dead center
Exhaust valve opens at 35° before bottom dead center and closes at 20° after top dead center
Exhaust valve opens at bottom dead center and closes at top dead center
May open and close anywhere

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Internal Combustion Engines
The brake power (B.P.) of the engine is given by (where W = Brake load or dead load in newtons, l = Length of arm in meters, N = Speed of engine in r.p.m., S = Spring balance reading in newtons, D = Dia. of brake drum in meters, and d = Dia. of rope in meters)

P = [(W - S) π (D + d) N]/60 watts
P = [(W - S) πDN]/60 watts
P = (Wl × 2πN)/60 watts
All of these

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