The Magnuson BlowerThe simplest Roots superchargers are still very much like the Chevy oil pump, but some of the most advanced, such as the Magnuson shown here, have evolved dramatically. Instead of being nearly straight, the rotors have a steep helix and are now classified as hybrid Roots/screw compressors. Shown here is the latest high-efficiency design from Magnuson. Instead of the classic top surface air entry, the air enters at the front of the unit. A vacuum-referenced bypass butterfly equalizes the supercharger inlet pressure with manifold pressure. This virtually eliminates all parasitic losses other than the unit's bearing losses. This means the impact on cruise mileage is virtually zero. The form of the case discharge into the manifold has also been refined. Mounting a modern super-efficient unit on an intercooled base/intake manifold complements the setup, and is the key to higher power on otherwise lower-octane fuel. View Related Article
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