Subaru EF engine

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EF12 MPFI engine in a 1993 Subaru Justy

The EF is an automotive engine made by Subaru, introduced in 1984 for the Subaru Justy. It is a water-cooled straight-3 engine with a belt-driven single overhead camshaft, and a chain driven balance shaft. It has an alloy cylinder head and iron engine block.

EF10[edit | edit source]

1.0-litre (997cc) 2 valves per cylinder

Subaru EF-10 Engine

Bore x Stroke: 78mm x 69.6mm


  • 47 bhp@5000rpm/59 ft·lbf@3200 rpm with single barrel Hitachi carburetor and 9.5:1 compression


  • Subaru Justy "J10" (limited to some European markets and Asia)
  • Subaru Libero "E10"

EF12[edit | edit source]

1.2-litre (1189cc) 3 valves per cylinder

Subaru EF-12 Engine

Bore x Stroke: 78mm x 83mm


  • 66 bhp@5200 rpm/70 ft·lbf@3600 rpm with two barrel Hitachi carburetor and 9:1 compression ratio
  • 73 bhp@5600 rpm/71 ft·lbf@3600 rpm with multi-port fuel injection and 9.1:1 compression ratio



  • 80 bhp with multi-point fuel injection


  • Subaru Tutto (Taiwan)

Links[edit | edit source]


Dusty's Justys