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Ford Sigma engine
Introduced in 1995, the Ford Sigma is a small straight-4 automobile engine sold by Ford Motor Company. First evolution of engines were sold as the "Zetec-SE" (although frequently badged as Zetec-S, not to be confused with the trim level). After the upgrade Ford renamed Sigma to Duratec.〔(Fuel, performance and emissions Ford Fiesta ), Ford.co.uk, 21 April 2009.〕 Last upgrade of engine is named Duratec Ti-VCT. The engine was introduced in the mid-1990s and production continues through the present. Like the ''SHO'' V6 and ''SHO'' V8, the Sigma was designed with help from Yamaha. Intended for Ford's smaller models, it was intended to replace the older ''HCS'' (a derivative of the even older Kent unit) and smaller capacity ''CVH'' units.
The Zetec-SE has no common parts or design with the larger Zetec-E engines apart from the name. This gives rise to some confusion since it suggests that they are members of the same family, but are in fact, completely different. Zetec-E units are mounted transversely with the inlet manifold at the rear, whereas the Zetec-SE units are mounted with the inlet manifold at the front.
==Introduction and Innovations==
When the Zetec-SE first arrived in 1995 it included many firsts, such as a plastic inlet manifold, a "ladder" style main bearing and crankcase assembly, and big-end bearing caps which are forged in one piece and subsequently split. It also incorporates powder metal connecting rods, which were quite exotic and notable at the time. The engine first appeared in the Mk4 Ford Fiesta and the virtually identical Mazda 121 in 1.25L (1242cc) capacity, with 1.4 L (1388cc), 1.6 L (1596cc) and 1.7 L (1679cc) derivatives coming later.
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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