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hile the Centrifugal supercharger may look more like what we think of as a turbo rather than a blower, it is engine driven by pulleys or gears and thereby is considered a supercharger. Though not driven by exhaust gases like a turbocharger, the Centrifugal supercharger does share the same type of inertial compressor. This style compressor requires high rpm, sometimes 50,000, so the compressor rpm is multiplied by a precision gear-case with bearings which can be oiled either by engine oil, or by a self-contained oiling system.

Unlike Roots and Screw type compressors, the centrifugal compressor, sometimes called the impeller, is not a positive displacement pump, so boost increases gradually as a function of rpm. This makes the centrifugal supercharger a great choice for street cars, especially those that are traction limited. By virtue of its design and smaller size, centrifugal superchargers can be mounted further from the intake, making them somewhat easier to intercool and keeping the compressor away from the engine, reducing air inlet temperatures.

Most centrifugal superchargers use a belt from the crankshaft to drive the gear-case, but in extreme, high-boost applications a cogged belt or even gear-drive is sometimes necessary. Manufacturers make centrifugal superchargers in all sizes, and most come as complete kits with all the necessary components. For older muscle cars, systems are available that blow through the carburetor, and for modern Mopars the kits come with new fuel injectors and computer programmed tuning. Centrifugal

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