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-three engine, four-stroke engine with a belt-driven single overhead camshaft, and a chain-driven balance shaft. It has an alloy cylinder head and a closed deck iron engine block with a bore spacing of 86.0 mm (3.39 in). The two-cylinder EK23 engine is closely related to the EF series, sharing the same bore spacing and overall design.[1] The export market 665 cc EK42 motor even shares the bore and stroke of the EF10.


1.0-litre (997 cc) two valves per cylinder

Subaru EF-10 Engine

Bore x Stroke: 78 mm (3.1 in) x 69.6 mm (2.7 in)


  • 47 bhp (35 kW; 48 PS) at 5000 rpm/59 lb·ft (80 N·m) at 3200 rpm with single barrel Hitachi carburetor and 9.5:1 compression ratio
  • 54 bhp (40 kW; 55 PS) at 6000 rpm/59 lb·ft (80 N·m) at 3600 rpm with dual barrel Hitachi carburetor and 9.5:1 compression ratio



1.2-litre (1189 cc) three valves per cylinder

Subaru EF-12 Engine

Bore x Stroke: 78 mm (3.1 in) x 83 mm (3.3 in)


  • 66 bhp (49 kW; 67 PS) at 5200 rpm/70 lb·ft (95 N·m) at 3600 rpm with two barrel Hitachi carburetor and 9:1 compression ratio
  • 73 bhp (54 kW; 74 PS) at 5600 rpm/71 lb·ft (96 N·m) at 3600 rpm with multi-port fuel injection and 9.1:1 compression ratio




  • Subaru Tutto (Taiwan)

External links[edit]


  1. ^ "スバルの軽自動車用エンジン" [Subaru's kei car engines]. a-design-for-life (in Japanese). 2014-09-27. Retrieved 2015-06-04.