Editing Ford Sigma engine (section)

{{Infobox automobile engine
|name          = Ford Sigma engine
|image         = Ford Zetec-S 1.6 16V engine.jpg
|manufacturer  = [[Ford Motor Company]], [[Yamaha Motor Company]]<ref name="lesoir" /><ref name="autonews" />
|aka           = {{ubl |Zetec-S|Zetec-SE|Duratec|Duratec Ti-VCT }}
|production    = 1995–present
|predecessor   = [[Ford CVH engine|CVH Engine]]<br />[[Ford Kent engine#HCS|Valencia-HCS engine]]
|successor     = [[Ford EcoBoost engine]]
|configuration = [[Straight-four engine|I4]]
|displacement  = {{ubl |{{cvt|1242|cc|L CID|1|order=flip}}|{{cvt|1388|cc|L CID|1|order=flip}}|{{cvt|1499|cc|L CID|1|order=flip}}|{{cvt|1596|cc|L CID|1|order=flip}}|{{cvt|1679|cc|L CID|1|order=flip}} }}
|bore          = {{ubl |{{cvt|71.9|mm|in|2}}|{{cvt|76|mm|in|2}}|{{cvt|79|mm|in|2}}|{{cvt|80|mm|in|2}} }}
|stroke        = {{ubl |{{cvt|76.5|mm|in|2}}|{{cvt|81.4|mm|in|2}}|{{cvt|83.5|mm|in|2}} |{{cvt|2000|cc|L CID|1|order=flip}}}}
|emissions control = Close-coupled, closed loop, [[Catalytic converter#Three-way|three-way catalyst]] with [[oxygen sensor]]
|emissions level = [[Euro 4]], [[Euro 5]]
|height        = 
|diameter      = 
|weight        = {{cvt|81|kg|0}} (1.6&nbsp;L Zetec)<br />{{cvt|90|kg|0}} (1.6&nbsp;L Duratec)
|block         = aluminium
|head          = aluminium
|valvetrain    = [[SOHC]] 2 valves x cyl.<br />[[DOHC]] [[Multi-valve#Four valves|4 valves x cyl.]] w/[[Variable Cam Timing#Ti-VCT|Ti-VCT]]
|supercharger  = On 2002 1.0-litre [[Ford Fiesta]]
|turbocharger  = 
|fuelsystem    = [[Electronic fuel injection]]<br />[[Sequential multi-port fuel injection|Sequential multi-port FI]]
|management    = PCM, [[Siemens]]
|fueltype      = gasoline
|oilsystem     = Pressure-fed with full flow oil filter
|coolingsystem = [[Radiator (engine cooling)|Water-cooled]]
|power         = {{cvt|60–155|PS|kW hp|0}}
|specpower     = 
|torque        = {{cvt|109–162|Nm|lbft|0}}
|compression   = 10.0:1, 10.3:1, 11.0:1, 11.8:1
}}

The '''Ford Sigma''' is a small [[Straight-four engine|straight four]] [[automobile]] [[internal combustion engine|engine]] introduced in 1995 by [[Ford Motor Company]]. Its first evolution was sold as the [[Ford Zetec engine#Zetec-SE|Zetec-S]] (not to be confused with the trim level), then Zetec-SE and finally, in later years, renamed [[Ford Duratec engine|Duratec]].<ref>[http://www.config.ford.co.uk/fordconnection/multimedia/gbr_en/00w/yyy/gbr_en00wyyyfuelspc.htm Fuel, performance and emissions Ford Fiesta], Ford.co.uk, 21 April 2009.</ref> 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 [[Ford HCS engine|HCS]] (a derivative of the even older [[Ford Kent engine|Kent]] unit) and smaller capacity [[Ford CVH engine|CVH]] units.