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The Sigma, also known as the Zetec or the Duratec, is a 1.6-liter naturally aspirated four-cylinder engine from Ford Motor used to power subcompact cars and utility vehicles, also known as CUVs. Featuring a dual overhead cam (DOHC) design, in an inline configuration, the Ford 1.6L Sigma architecture has been part of the Ford Sigma engine family since 1995, seeing several revisions up until 2004.

When the Zetec-SE engine first arrived in 1995, it featured many technological firsts, such as a plastic inlet manifold, a “ladder” style main bearing and a crankcase assembly. Due to a partnership with Yamaha, this engine also incorporated powder metal connecting rods, components that were normally not seen in a mainstream engine at the time. The most recent iteration, commercialized under the Duratec name, introduced Ford’s Twin Independent Variable Camshaft Timing (Ti-VCT) technology which allowed it to evolve tremendously in power, torque and efficiency given its small displacement. While the Ford 1.6L Sigma engine currently does not power Ford vehicles sold in North America, it continues to power the following vehicles in other markets:

  • Ford C-MAX
  • Ford Escort (China)
  • Ford Fiesta
  • Ford Focus
  • Ford Mondeo

Overview

MetricValue
Engine familySigma / Duratec
Displacement1.6 liters
AspirationAtmospheric
Configuration & cylindersInline configuration, four cylinders
Vehicle engine orientationTransverse
Valve configurationDual-overhead cam (DOHC)
Assembly sitesCologne, Germany / Chongqing, China / India / Russia / Taubaté, Brazil
PredecessorFord Kent engine
SuccessorFord EcoBoost

Specifications

MetricValue
Bore79 mm
Stroke81.4 mm
Compression ratio11.1
Max power @ RPM123 hp @ 6,000 rpm
Max torque @ RPM118 lb-ft @ 4,100 rpm
Cylinder headAluminum
Cylinder blockAluminum
Camshaft driveBelt

Vehicle Applications

VehicleTransmissionDrive Wheels[email protected] RPMTorque (lb-ft) @ RPM
Ford C-MAX (2010 +)Six-speed manual / Six-speed automaticFWD104 @ 6,000111 @ 4,500
Ford Escort (China only - 2015 +)Five-speed manual / Six-speed automaticFWD113 @ 6,000 114 @ 4,150
Ford Fiesta (2008 +)Six-speed manual / Six-speed automaticFWD118 @ 6,000 112 @ 4,050
Ford Focus (2004 - 2011)Five-speed manual / Four-speed automaticFWD113 @ 6,000 114 @ 4,150
Ford Focus (2011 +)Six-speed manual / Six-speed automaticFWD104 @ 6,000 111 @ 4,500
Ford Mondeo (2007 +)Five-speed manual / Six-speed automaticFWD113 @ 6,000 114 @ 4,150

Discussion

Discuss the Ford 1.6L Sigma engine in our Ford forum.

News

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Photos

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