Subaru EJ engine

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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.

Contents

[edit] 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.

[edit] EJ15

1.5 Litre SOHC

Usage:

  • Impreza (JDM only, though often seen in gray market exports to eastern Europe and Russia.)

[edit] EJ16

1.6 Litre SOHC, 90hp @ 5600rpm.

Usage:

  • Impreza 93-94 (JDM only)
  • Impreza 93-06 (Europe & Middle East)

[edit] EJ18

1.8 Litre SOHC

Usage:

  • Impreza 93-96
  • Legacy 90-96

[edit] EJ20

2.0 Litre SOHC or DOHC

[edit] 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 referring to the EJ20T, one is speaking of one of the following:

[edit] EJ20G

Usage:

  • Legacy RS 89-93
  • Legacy RS-RA 89-93
  • Legacy GT 89-93
  • Impreza WRX 92~96
  • Impreza WRX Wagon 92~98
  • Impreza WRX STi 94~96

[edit] EJ20K

Design change in 1997 from the EJ20G.

Usage:

  • Impreza WRX STi 9/96~9/98

[edit] EJ205

This engine series is used for non-Japanese marketed WRX models in the world market as of 1999. The Japanese WRX models use the EJ207 from 1999~2001, except the 5-door wagon which also uses the EJ205. After 2001, all WRXs use the EJ205.

Usage: Impreza WRX 99~current

[edit] EJ207

Usage:

[edit] EJ20TT

This can refer to one of the 2.0 Litre DOHC Sequential Twin Turbo and intercooled engines (EJ20H/EJ20R), used in specialty Legacies.

Usage:

[edit] EJ20H

Usage:

  • Legacy BD/BG5 JDM GT's (183kw manual & auto) and GTB's (190kw auto)

[edit] EJ20R

Usage:

  • Legacy BD/BG5 JDM RSB and GTB's (205kw Manual)

[edit] EJ22

2.2 Litre SOHC

Usage:

  • Impreza 95-01
  • Legacy 90-93

[edit] EJ22E

2.2 litre

135 BHP 140 Ft.LBS

Usage:

  • Legacy 89-96

[edit] EJ22T

2.2 Litre SOHC Turbo, no intercooler

  • Legacy 89-94 (USDM only from 1991)

[edit] EJ22K

Usage:

  • Impreza WRX STi 22B (JDM)

[edit] EJ25

2.5 Litre

[edit] EJ251

SOHC Usage:

  • Impreza 00~02 (US)
  • Impreza Outback 02 (US)
  • Forester 00~02

[edit] EJ252

SOHC Usage:

  • Legacy 00

[edit] EJ253

SOHC

  • Impreza 02~07
  • Legacy 01~02
  • Forrester 99
  • Baja 03~06

[edit] EJ25D

DOHC

Usage

  • Impreza 98
  • Legacy 96~99
  • Forester 98~99

[edit] EJ25E

SOHC 16 valve

Usage:

  • Impreza 99~01
  • Forester 99~00
  • Legacy 00~01

[edit] EJ255

2.5 litre DOHC AVCS turbocharged, with sodium-filled valves originally designed for North American market, now sees usage in some European Imprezas and Legacies destined for Australia and South Africa.

Usage in North America:

Usage in the rest of the world:

[edit] EJ257

DOHC 16 valve turbo

Usage:

  • US Market Impreza WRX STi MY04~present (300HP)
  • US Market Forester XT MY04~present
  • US Market Legacy GT MY05~present
  • US Market Baja Turbo MY04~present
  • US Market Outback XT MY05~present
  • Asian, European Market Impreza WRX STi 05~present (280HP, 40KGh/m)
  • JDM Impreza WRX STi from 2007 ~ (next generation) will produce 330++HP with 45KGh/m torque


[edit] Other Data

All the EJ series share compatibility and construction similairity and are 16 valved engines. The EJ series started with the EJ15, a 1.5 liter (SOHC) and makes ~90hp, then the EJ16, a 1.6 litre single overhead cam (SOHC). Later followed by the EJ20, a 120hp 2.0 litre single overhead cam and the EJ22, a 132hp 2.2 litre single overhead cam. Both the EJ20 and EJ22 turbocharged versions were developed 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-interference 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-interference 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, if the timing belt fails the engine will likely be destroyed or the valves & piston will be heavily damaged.

[edit] Awards

Subaru 2.5-liter Turbo Boxer Engine won 2006 International Engine of the Year.

http://www.ukintpress.com/engineoftheyear/winners/2_25.html

[edit] References

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