Subaru EJ engine
series of four-stroke automotive engines manufactured by Subaru
The Subaru EJ engine is a series of four-stroke automotive engines manufactured by Subaru. Introduced in 1989, they were 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 94 to 341 hp (70 to 254 kW; 95 to 346 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 Volkswagen T3/Vanagons powered by the Volkswagen Wasserboxer engine. Primary engineering on the EJ series was done by Masayuki Kodama, Takemasa Yamada and Shuji Sawafuji of Fuji Heavy Industries, Subaru's parent company.
EJ15 (1.5L Boxer NA)
Usage:
Impreza GC1 series (JDM) — Replaced by Subaru EL engine in 2006 GD, GG, GE & GH series (JDM) Impreza.
Impreza 93–06 (Latin America)
Specifications
Displacement: 1,493 cc (1.5 L; 91.1 cu in)
Bore: 85 mm (3.35 in)
Stroke: 65.8 mm (2.59 in)
Compression Ratio: 9.4:1 – 10.0
Valvetrain: SOHC, 16 valves
Fuel Delivery multi point fuel injection
EJ151
Horsepower: 97 PS (71 kW; 96 bhp) at 6000 rpm
Torque: 129 N⋅m (95 lb⋅ft) at 3600 rpm
EJ152
Horsepower: 102 PS (75 kW; 101 bhp) at 5600 rpm
Torque: 137 N⋅m (101 lb⋅ft) at 4000 rpm
EJ153
Horsepower: 95 PS (70 kW; 94 bhp) at 5200 rpm
Torque: 140 N⋅m (103 lb⋅ft) at 3600 rpm
EJ154
Horsepower: 100 PS (74 kW; 99 bhp) at 5200 rpm
Torque: 142 N⋅m (105 lb⋅ft) at 4000 rpm
EJ16 (1.6L Boxer NA)
Usage:
Impreza 93–94 (JDM only) GC4 series
Impreza 93–06 (Europe & Middle East)
Impreza 93–97 (Australia)
Impreza 93–06 (Latin America)
Specifications
Displacement: 1,597 cc (1.6 L; 97.5 cu in)
Bore: 87.9 mm (3.46 in)
Stroke: 65.8 mm (2.59 in)
Compression Ratio: 9.4:1 – 10.0:1
Valvetrain: SOHC Belt drive
Fuel Delivery mpfi (carburetor in some locations)
EJ16
Horsepower: 90–98 PS (66–72 kW; 89–97 bhp) at 6000 rpm
Torque: 138 N⋅m (102 lb⋅ft) at 4500 rpm
EJ18 (1.8L Boxer NA)
Usage:
Impreza 93–99 GC6 series
Legacy (except USA) 90–96 BC2, BC3, BD2, BD3, BG3 series
Isuzu Aska (1990–1993)
Specifications
Displacement: 1,825 cc (1.8 L; 111.4 cu in)
Bore: 87.9 mm (3.46 in)
Stroke: 75 mm (2.95 in)
Compression Ratio: 9.5:1 – 9.7:1
Valvetrain: SOHC
Fuel Delivery Carburetor + Distributor (mainly for Latin American and Asian markets) and single point fuel injection
EJ181
Horsepower: 110 PS (81 kW; 108 bhp) at 6000 rpm
Torque: 149 N⋅m (110 lb⋅ft) at 3200 rpm
EJ182
Horsepower: 115 PS (85 kW; 113 bhp) at 6000 rpm
Torque: 154 N⋅m (114 lb⋅ft) at 4500 rpm
EJ183
Horsepower: 120 PS (88 kW; 118 bhp) at 5600 rpm
Torque: 164 N⋅m (121 lb⋅ft) at 3600 rpm
EJ20 (2.0L Boxer Turbo/NA)
Bore: 92 mm (3.62 in)
Stroke: 75 mm (2.95 in)
At the 46th Tokyo Motor Show in October 2019, Subaru announced it would conclude production of the EJ20 by the end of March 2020. At that time, the EJ20 was only being sold in the Japanese domestic market for the WRX STI, and a special "WRX STI EJ20 Final Edition" with a balanced version of the engine was sold to commemorate the end of EJ20 production.
Naturally aspirated
EJ20E SOHC naturally aspirated
Legacy JDM
1989–1994 125 PS (92 kW; 123 hp) BC — BF series
1993–1999 135 PS (99 kW; 133 hp) BD — BG series( ECU code EURO, D3; Asia 4H)
1998–2004 155 PS (114 kW; 153 hp) BE — BH series( ECU code EURO, D3; Asia 4H)
2003–2009 140 PS (103 kW; 138 hp) BL — BP series
Europe
1991–1999 115 PS (85 kW; 113 hp) BC, BD, BF series
Impreza JDM
1993–1999 135 PS (99 kW; 133 hp) GC — GF series
2008–current 140 PS (103 kW; 138 hp) GH — GE series
Europe
1994–1999 115 PS (85 kW; 113 hp) GC, GF series
Isuzu Aska (1990–1993)
1990–1993 125 PS (92 kW; 123 hp)
EJ201 SOHC naturally aspirated
Bore: 92 mm (3.62 in)
Stroke: 75 mm (2.95 in)
MAP sensor
Forester (Europe) SF and SG Series (pre-facelift)
2002–2005 125 PS (92 kW; 123 hp)
GD/GG Impreza
2000–2005 125 PS (92 kW; 123 hp)
GC/GF Impreza
BE/BH Legacy
EJ20D DOHC naturally aspirated
Legacy JDM
1989–1999 150 PS (110 kW; 148 hp) BC — BF and BD — BG series
EJ202 SOHC naturally aspirated
Forester JDM SF series, 138 PS (1997 – 2002)
Forester JDM SG series, 137 PS (2004, perhaps 2003–2005), e.g.
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