Subaru EJ engine

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Subaru EJ engine
Overview
Manufacturer	Subaru
Production	1988–2021 (EJ20) [1]
Layout
Configuration	Flat-four
Displacement	1.5 L; 91.1 cu in (1,493 cc) 1.6 L; 97.5 cu in (1,597 cc) 1.8 L; 111.1 cu in (1,820 cc) 2.0 L; 121.7 cu in (1,994 cc) 2.2 L; 135.0 cu in (2,212 cc) 2.5 L; 149.9 cu in (2,457 cc)
Cylinder bore	85 mm (3.35 in) 87.9 mm (3.46 in) 92 mm (3.62 in) 96.9 mm (3.81 in) 99.5 mm (3.92 in)
Piston stroke	65.8 mm (2.59 in) 75 mm (2.95 in) 79 mm (3.11 in)
Valvetrain	DOHC/SOHC 4 valves x cyl. with AVCS or AVLS (some versions)
Compression ratio	8.0:1, 8.5:1, 9.0:1, 9.4:1, 9.5:1, 9.7:1, 10.0:1
Combustion
Turbocharger	Optional
Fuel system	Carburetor, Fuel injection
Fuel type	Gasoline
Cooling system	Water cooled
Output
Power output	96 to 310 hp (72 to 231 kW; 97 to 314 PS)
Torque output	129 to 407 N⋅m (95 to 300 lb⋅ft)
Chronology
Predecessor	Subaru EA engine
Successor	Subaru FB engine

The Subaru EJ engine is a series of four-stroke automotive engines manufactured by Subaru. They were introduced in 1989, intended to succeed the previous Subaru EA engine. The EJ series was the mainstay of Subaru's engine line, with all engines of this series being 16-valve horizontal flat-fours, with configurations available for single, or double-overhead camshaft arrangements (SOHC or DOHC). Naturally aspirated and turbocharged versions are available, ranging from 96 to 310 hp (72 to 231 kW; 97 to 314 PS). These engines are commonly used in light aircraft, kit cars and engine swaps into air-cooled Volkswagens, and are also popular as a swap into copy wasserboxer engined Volkswagen T3/Vanagon. Primary engineering on the EJ series was done by Masayuki Kodama, Takemasa Yamada and Shuji Sawafuji of Fuji Heavy Industries,^[2] Subaru's parent company.