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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.
In 1900, Gottlieb Daimler patented a Roots supercharger for a car's internal combustion engine. [7] In 1931, Roots Blower Company and Connersville Blower Company were bought by the International Derrick and Equipment Company to found Roots-Connersville Blower Company. The same year, the company began production of centrifugal compressors. [8]
In the 1960s Godfrey continued to make the Roots-type cabin air compressors (a development of the original Marshall), but also a screw-type compressor. Surplus stores of these cabin superchargers (Marshall cabin blowers) were repurposed after the war and used for tuning cars (mainly for racing, hill-climbing, etc.).
This was an opposed-piston engine with a choice of two, three and four cylinders (2ZG9, 3ZG9, 4ZG9); the two-cylinder version developed 120 bhp. Its layout was very similar to the Commer engines, but it used a piston scavenge pump rather than a Roots blower. This was mounted vertically above one rocker, driven by a bellcrank from the main rockers.
Bentley 6.5 Litre. The Bentley 4½ Litre is a British car based on a rolling chassis built by Bentley Motors. [1] Walter Owen Bentley replaced the Bentley 3 Litre with a more powerful car by increasing its engine displacement to 4.4 litres (270 cubic inches). A racing variant was known as the Blower Bentley.
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 ]
Initial engine options comprised the C 180 (139 PS), C220 (143 PS), C 200 Kompressor, and C 230 Kompressor. In 2003, Mercedes-Benz added the C 180 Kompressor, followed by the C 200 compressor in 2003-2007 (187 hp), and finally the C 160 Kompressor in 2005. The C 230 SportCoupé was powered by a 2.3-litre supercharged, four-cylinder motor.
The term "blower" is applied to rotary screw, roots-type, and centrifugal compressors when utilized as part of an automotive forced induction system. The term 'cabin blower' is also used for the pressurisation of aircraft for high altitude flight, which used Roots type compressors particularly in the 1950s (see Marshall supercharger).