Ford Sigma engine
| Ford Sigma engine | |
|---|---|
| Overview | |
| Manufacturer | Ford Motor Company |
| Also called | Zetec Duratec Duratec Ti-VCT |
| Production | 1995- |
| Combustion chamber | |
| Configuration | DOHC straight 4 |
| Displacement | 1.25 L 1.4 L 1.5 L 1.6 L 1.7 L |
| Cylinder block alloy | aluminium |
| Cylinder head alloy | aluminium |
| Combustion | |
| Supercharger | none |
| Turbocharger | none |
| Fuel system | EFI |
| Fuel type | gasoline |
| Dimensions | |
| Dry weight |
1.6 L Zetec - 81 kg |
| Chronology | |
| Predecessor |
Ford CVH engine Ford Kent engine |
| Successor | Ford EcoBoost engine |
1.6 L Zetec - 81 kg
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. 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. Conceived 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.
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.
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Wikipedia