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An Eaton M62 Roots-type supercharger is visible at the front of this Ecotec LSJ engine in a 2006 Saturn Ion Red Line.. The Roots-type blower is simple and widely used. It can be more effective than alternative superchargers at developing positive intake manifold pressure (i.e., above atmospheric pressure) at low engine speeds, making it a popular choice for passenger automobile applications.
The Roots Blower Company was an American engineering company based in Connersville, Indiana. It was founded in 1854 by the inventors Philander Higley Roots and Francis Marion Roots. It is notable for the Roots blower, a type of pump. [1]
The most common type of positive-displacement superchargers is the Roots-type supercharger. Other types include the rotary-screw, sliding vane and scroll-type superchargers. The rating system for positive-displacement superchargers is usually based on their capacity per revolution. In the case of the Roots blower, the GMC rating
The Roots supercharger dates back to the 1860s, and this is the basis for the original Wade supercharger, but with patented modifications incorporated. The first patent of Costin and Densham deals with ways to achieve compression within the Roots-style blower. [2]
The Marshall superchargers were initially manufactured by Marshall Drew and Co Ltd in the 1930s and marketed for increasing car performance. [2] Toward the end of the 1930s Marshall superchargers were listed by Sir George Godfrey and Partners (Holdings) Ltd of Hanworth, Middlesex, made by them to the designs of J.W. Marshall. [3]
The huge Roots-type supercharger, known in racing circles as a blower, was added in front of the radiator and driven straight from the crankshaft. This gave the Blower Bentley a unique and easily recognisable profile, and exacerbated its understeer. [8] The crankshaft, pistons and lubrication system were also special to the Blower engine. [4]
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All 567 engines use forced induction, with either a Roots blower or a turbocharger. The turbocharger (a combination turbo-compressor system) follows EMD's innovative design that uses a gear train and over-running clutch to drive the compressor rotor during low engine speed, when exhaust gas temperature (and, correspondingly, heat energy) alone ...