| Ford Sigma engine | |
|---|---|
 | |
| Overview | |
| Manufacturer | Ford Motor Company, Yamaha Motor Company[1][2] |
| Also called | Zetec-S Zetec-SE Duratec Duratec Ti-VCT |
| Production | 1995–present |
| Layout | |
| Configuration | Straight-4 |
| Displacement | 1.2 L; 75.8 cu in (1,242 cc) 1.4 L; 84.7 cu in (1,388 cc) 1.5 L; 91.5 cu in (1,499 cc) 1.6 L; 97.4 cu in (1,596 cc) 1.7 L; 102.5 cu in (1,679 cc) |
| Cylinder bore | 71.9 mm (2.83 in) 76 mm (2.99 in) 79 mm (3.11 in) 80 mm (3.15 in) |
| Piston stroke | 76.5 mm (3.01 in) 81.4 mm (3.20 in) 83.5 mm (3.29 in) |
| Cylinder block material | aluminium |
| Cylinder head material | aluminium |
| Valvetrain | SOHC 2 valves x cyl. DOHC 4 valves x cyl. w/Ti-VCT |
| Compression ratio | 10.0:1, 10.3:1, 11.0:1, 11.8:1 |
| Combustion | |
| Supercharger | On 2002 1.0–litre Ford Fiesta |
| Fuel system | Electronic fuel injection Sequential multi-port FI |
| Management | PCM, Siemens |
| Fuel type | gasoline |
| Oil system | Pressure-fed with full flow oil filter |
| Cooling system | Water-cooled |
| Output | |
| Power output | 60–155 PS (44–114 kW; 59–153 hp) |
| Torque output | 109–162 N⋅m (80–119 lb⋅ft) |
| Dimensions | |
| Dry weight | 1.6 L Zetec - 81 kg (179 lb) 1.6 L Duratec - 90 kg (198 lb) |
| Emissions | |
| Emissions target standard | Euro 4, Euro 5 |
| Emissions control systems | Close-coupled, closed loop, three-way catalyst with oxygen sensor |
| Chronology | |
| Predecessor | CVH Engine Valencia-HCS engine |
| Successor | Ford EcoBoost engine |
The Ford Sigma is a small straight-4 automobile engine introduced in 1995 by Ford Motor Company. Its first evolution was sold as the Zetec-S (not to be confused with the trim level), then Zetec-SE and finally, in later years, renamed Duratec.[3] The last upgrade of the engine is named Duratec Ti-VCT. Conceived for Ford's smaller models, the motor was intended to replace the older HCS (a derivative of the even older Kent unit) and smaller capacity CVH units.