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Reciprocating internal combustion engine
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.
^"Subaru Will Retire Prolific EJ20 Engine with WRX STI Final Edition". 23 October 2019.
^Kodama, Masayuki; Yamada, Takemasa; Sawafuji, Shuji (1 February 1989). "Subaru New Horizontally Opposed 4-valve Engine". Society of Automotive Engineers. SAE Technical Paper Series. 1: 20. doi:10.4271/890471. ISSN 0148-7191. Retrieved 5 December 2022.
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