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Ford 1.0L EcoBoost Fox Engine

The Fox is a 1.0 liter, turbocharged three-cylinder engine from Ford Motor used to power subcompact cars and utility vehicles, or more commonly known as CUVs. Featuring a dual overhead cam (DOHC) design, in an inline configuration, the Ford Fox architecture has been part of the Ford EcoBoost family of turbocharged engines since 2012.

The Ford 1.0L EcoBoost Fox engine received important updates in 2017. Although thermodynamically similar to its predecessor, it was entirely reconfigured to integrate a new cylinder deactivation system for improved efficiency. A dual-mass flywheel and a vibration-damping clutch disc were also added to quell engine oscillations when running on two cylinders. Offered in two different variations, with different power ratings, the Ford 1.0L EcoBoost Fox engine was awarded the International Engine of Year twice. It powers the following vehicles.


Engine familyEcoBoost
Displacement1.0 liter
Configuration & cylindersInline, three cylinders
Vehicle engine orientationTransverse
Valve configurationDual overhead cam (DOHC) with variable camshaft timing (VCT)
Assembly sitesCologne, Germany, Craiova, Romania, and Chongqing, China
PredecessorFord Sigma engine
SuccessorCurrently none


Bore71.9 mm
Stroke82 mm
Compression ratio10.0:1
Max power @ RPM125 @ 6,000 rpm
Max torque @ RPM170 lb-ft @ 1,400 rpm (up to 200 lb-ft with transient overboost)
Cylinder headCast aluminum
Cylinder blockCast iron
Camshaft driveBelt

Vehicle Applications

VehicleTransmissionDrive WheelsPower @ RPMTorque (lb-ft) @ RPM
Ford EcoSportSix-speed automatic / Six-speed manualFWD / AWD123 @ 6,000 125 @ 6,000
Ford FiestaSix-speed automatic / Six-speed manualFWD99 @ 6,000 rpm / 123 @ 6,000 125 @ 6,000
Ford FocusSix-speed automatic / Six-speed manualFWD99 @ 6,000 / 123 @ 6,000125 @ 6,000


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