6 SUPERCHAHGING
Supercharging is a method of increasing the power output of the engine without increasing its weight and size. This can be made possible by increasing the density of the charge in the engine cylinder, which ensures greater amount of the charge aspirated into the same stroke volume. The density of the charge can be appreciably increased by raising the pressure of the air or mixture above that of the surrounding atmosphere by a compressor. So, supercharging can be defined as the admittance of the more charge into the engine cylinder than what the engine can take during the normal suction stroke.
The main object of supercharging is to obtain more power by burning the larger amount of fuel or to reduce the weight and size of the engine for a given power output.