The Subaru EJ engine is a series of automotive engines manufactured by Subaru, a division of Fuji Heavy Industries introduced mid 1989 for the 1st generation Legacy. The engine was designed by Masayuki Kodama, Takemasa Yamada and Shuji Sawafuji of FHI Ltd. Engines of this series are 16 valve flat-4 horizontal, with configurations available for SOHC and DOHC, natural aspiration and turbocharged.
Identifying An EJ
A 10-digit engine code is used by Subaru: the first 2 characters identify the engine series. The 3rd & 4th identify displacement volume in liters. The 5th digit is a sub-series identifier and fuel system flag. The 6th digit identifies emissions regulations it conforms to, while the 7th digit shows the intended transmission it was mated with. The final 3 digits are minor production change codes.
EJ18
1.8 Litre SOHC
Usage:
- Impreza 93-96
EJ20
2.0 Litre SOHC
EJ20T
This is not actually a valid code from Subaru, but is mostly used by enthusiasts & mechanics to describe the entire line of 2.0 litre turbocharged engines that have been available over time. When refferring to the EJ20T, one is speaking of one of the following:
EJ20G
Usage:
- Impreza WRX 92~93
- Impreza WRX STi 94~96
EJ20K
Design change in 1997 from the EJ20G.
Usage:
- Impreza WRX STi 96~98
EJ205
EJ207
Usage:
- Impreza WRX STi 98~99
EJ20H
EJ20R
EJ20TT
2.0 Litre DOHC Sequential Twin Turbo, intercooled
Usage:
- Legacy GT & B4 (JDM)
EJ22
2.2 Litre SOHC
Usage:
- Impreza 95-96
- Legacy 90-93
EJ22E
2.2 litre
Usage:
- Legacy 89-95
EJ22ET
2.2 Litre SOHC Turbo, no intercooler
- Legacy 89-94
EJ22K
Usage:
- Impreza WRX STi 22B (JDM)
EJ25
2.5 Litre SOHC
Usage:
- Impreza 99~
- Forester 99~
- Legacy 00~
2.5 Litre DOCH
Usage:
- Impreza 98
- Forester 98
- Legacy 96~99
EJ25D
- Legacy
EJ25E
Other Data
All the EJ series share compatibility and construction similairity and are 16 valved engines. The EJ series started with the EJ18, a 1.8 litre single overhead cam (SOHC), followed by the EJ20, a 116hp 2.0 litre single overhead cam and the EJ22, a 132hp 2.2 litre single overhead cam. Of the EJ20 and EJ22 turbocharged versions were developed both with dual overhead cams, as well as non-turbo DOHC engines and DOHC twin-turbos. The EJ18 and EJ20 were most popular in Europe and the EJ22 mostly in the US and is known as the bulletproof Subaru engine.
The SOHC EJ Subaru boxer engines were non-inteference engines through 1996, run by a single timing belt driving both cams (both sides of the engine) and the water pump. If the timing belt fails, the engine of the models up to 1996 will not be destroyed but re-timing is necessary, because they are non-inteference engines. The oil pump is driven directly from the crank shaft and the waterpump by the timing belt. All DOHC and 1997-up SOHC EJ engines are interference engines.
EJ20DET
This is a misappropriation of similar Nissan engine codes & is not an actual engine.
References
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