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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 ]
In 1875, Roots exhibited a blower at the Saint Petersburg Exhibition; Thwaites and Carbutt exhibited a Roots principle "air blowing machine" for mine ventilation in the same exhibition. [ 6 ] In 1885, Edgar Dwight Johnston joined the firm of 30 people; he became vice president in 1889 and president in 1898, remaining so until at least 1931.
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 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.).
The blowers and camshafts are at the "rear" end of the engine, with the blowers mounted above the power take off. [8] All engines have mechanically-controlled unit injectors (patented in 1934 by General Motors, EMD's former owner). All 567 engines use forced induction, with either a Roots blower or a turbocharger. The turbocharger (a ...
Howden was born in Prestonpans, East Lothian, in 1832, [1] the son of James Howden and his wife, Catherine Cowden, [2] [3] and was educated at the local parish school. [4] His first marriage was to Helen Burgess Adams, with whom he had one daughter, Catherine Spence Howden (1873–1925), [5] and his second to Allison Moffat Hay, with whom he had two sons, James Howden (1883–1908) and William ...
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Founder William Rootes. Rootes was founded in Hawkhurst, Kent, in 1913 by William Rootes as a car sales agency independent from his father's Hawkhurst motor business. Rootes had moved his operations to Maidstone by 1914 and there he contracted to repair aero engines.
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