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Forced induction can be used to increase the power of an engine, its efficiency, or both, without much extra weight. Pressurizing the intake of combustion ingredients increases the effective capacity of the engine without an increase in physical size. The forced induction approach has the advantage that the intake pressure may be regulated according to the engine speed, thus providing power from extra capacity at high speed, but without wasting fuel at lower speeds.

The two different forced induction technologies in common use are Supercharger s and Turbocharger s. They differ mainly in the power source for the compressor. Turbochargers are driven by the exhaust gases of the engine, whereas superchargers are driven by a belt connected to the crankshaft of the engine. Also, turbochargers require a connection to the oiling system of the engine, whereas superchargers do not.