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Hemispherical combustion chamber
A hemispherical combustion chamber is a type of combustion chamber with a domed cylinder head. The hemispherical shape provides some advantages in an internal combustion engine. An engine featuring this type of chamber is known as a hemi engine, as with the Chrysler Hemi engine.
==History==
Hemispherical combustion chambers were introduced on some of the earliest automotive engines, shortly after proving the concept of internal combustion engines themselves.
Hemispherical cylinder heads have been used since at least 1901;〔Curtis Boat & Woodworking Co. 1901 Hemi engine by Truscott Launch and Engine Company, St Joeseph, MI. Designed by Hemi inventor, Allie Ray Welch, Chelsea Manufacturing Company, Chelsea, MI.. CurtisBoat.com. 2009-09-25. URL:http://www.curtisboat.com/hemi_prototype.html. Accessed: 2009-09-25. (Archived by WebCite at http://www.webcitation.org/5k4B8p3aw)〕 they were used by the Belgian car maker Pipe in 1905 and the 1907 Fiat 130 HP Grand Prix racer.〔(【引用サイトリンク】url=http://www.ddavid.com/formula1/fiat130.htm )〕 The Peugeot Grand Prix Car of 1912 and the Alfa Romeo Grand Prix car of 1914 both were four valve engines also, Daimler, and Riley were also using hemispherical combustion chambers. Stutz, beginning in 1912, used four-valve engines, conceptually anticipating modern car engines. Other examples include the BMW double-pushrod design (adopted by Bristol Cars), the Peugeot 403, the Toyota T engine and Miller racing engines, and the Jaguar XK engine.〔(【引用サイトリンク】title=Miller 91 )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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