Since the main object of supercharging is to increase the power output of these engine without
increasing its rotational speed or the dimensions of the cylinder. This is achieved by increasing the
charge of air, which results more burning of the fuel and a higher mean effective pressure. So there are
three possible methods that increase the air consumption of an engine,
1.To increasing the piston displacement, but this increases the size and weight of the engine, and
introduces additional cooling problems.
2.Running the engine at higher speeds, which results in increased fluid and mechanical friction
losses, and imposes greater inertia stresses on engine parts.
3.Increasing the density of the charge, such that a greater mass of charge is introduced into the
same volume or same total piston displacement.