A supercharger (blower) is an air compressor that forces more
air and, thus, more oxygen into the combustion chamber(s) of an internal
combustion engine than achievable with ambient atmospheric pressure (natural
The additional mass of oxygen-containing air that is forced into the engine improves on its volumetric efficiency which allows it to burn more fuel in a given cycle�which in turn makes it produce more power. A supercharger can be powered mechanically by belt, gear and shaft, or chain-drive from the engine's crankshaft. It can also be driven by a gas turbine powered by the exhaust gases from the engine. Turbine-driven centrifugal superchargers are correctly referred to as turbo-superchargers�or more commonly as turbochargers.
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Types of supercharger
There are two main types of supercharger defined according to the method of compression, positive displacement and dynamic compressors. The former deliver a fairly constant level of boost regardless of engine speed (RPM), whereas the latter deliver increasing boost with increasing engine speed.
Positive displacement pumps deliver a nearly fixed volume of air per revolution at all speeds (minus leakage which is nearly constant at all speeds for a given pressure and so its importance decreases at higher speeds). The device divides the air mechanically into parcels for delivery to the engine, mechanically moving the air into the engine bit by bit.
Major types of positive displacement pumps include:
* Lysholm screw
* Sliding Vane
* Scroll-type supercharger, also known as the G-lader
* Piston as in Bourke engine
Positive displacement pumps are further divided into internal compression and external compression types.
Roots superchargers are typically external compression only (although high helix roots blowers attempt to emulate the internal compression of the Lysholm screw).
* External compression refers to pumps which 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 supercharger. That causes a back flow from the engine into the supercharger until the two reach equilibrium. It is the back flow which actually compresses the incoming gas. This is a highly inefficient process and the main factor in the lack of efficiency of roots superchargers when used at high boost levels. The lower the boost level the smaller is this loss and roots blowers are very efficient at moving air at low pressure differentials, which is what they were first invented for (hence the original term "blower").
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