A supercharger is an air compressor used for forced induction of an internal combustion engine The greater mass flow-rate provides more oxygen to support combustion than would be available in a naturally aspirated engine which allows more fuel to be provided and more work to be done per cycle, increasing the power output of engine. A supercharger can be powered mechanically by a belt, gear, shaft, or chain connected to the engine’s cranksoft. Roots superchargers are typically external compression only.
External compression refers to pumps that transfer air at ambient pressure into the engine.If the engine is running under boost conditions, the pressure in the intake manifold is higher than that coming from the super charger. Internal compression refers the compression of air within the supercharger itself, which, already at or close to boost level, can be delivered smoothly to the engine with little or no backflow.
