List of Subaru engines

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Subaru uses a four or five character code to identify all of their engines.[1]

  • The first letter is always E standing for engine (before the introduction of FB engine series)
  • The second letter is the engine's family.
  • Next come two digits indicating the engine's displacement (or revision before 1989)
  • The optional fifth character is an identifier to mark revisions, (ex: turbo, DOHC, Fuel Injection, etc.)

Two Cylinder[edit]

Subaru EK engine[edit]

The EK series was a straight twin two-stroke cycle with early air-cooled versions later replaced with water-cooled configurations in 1971. The engine was upgraded to a four-stroke SOHC in 1973 to meet Japanese Government emission regulations.

The (Japanese: Subaru EK series) was used from 1958 until 1989 in most Kei car models.

Two-strokes

Air Cooled two-stroke

EK31
  • EK31: 356 cc Bore & Stroke = 61.5 x 60 mm
  • maximum output 16 PS (12 kW; 16 hp) at 4,500 rpm (1958.05-1960.02)
  • maximum output 18 PS (13 kW; 18 hp) at 4,700 rpm (1960.02-1964.07)
  • maximum output 20 PS (15 kW; 20 hp) at 5,000 rpm (1964.07-1968.08)
  • compression ratio = 6.5:1

Used in the Subaru 360 (1958–1968) and Sambar (1961–1970).

  • EK51: 423 cc Bore & Stroke = 67.0 x 60.0 mm
  • maximum output 23 PS (17 kW; 23 hp) at 5,000 rpm
  • compression ratio = 6.5:1

Used in the Subaru 450 (MAIA) Japan & North America (1960–66)

  • EK32: 356 cc Bore & Stroke = 61.5 x 60 mm
  • maximum output 25 PS (18 kW; 25 hp) at 5,500 rpm (1968.08-1970)
  • maximum output 36 PS (26 kW; 36 hp) at 7,000 rpm (1968.11-1970)
  • compression ratio = 7.5:1
  • Used in the Subaru 360 and 360 Young SS, 1968-70.

  • EK33: 356 cc Bore & Stroke = 61.5 x 60 mm
  • compression ratio = 6.5:1 (standard) 7.5:1 (Young SS & Sport Edition)
  • maximum output 26 PS (19 kW; 26 hp) at 5,800 rpm (R-2 Van K41, Sambar K55/K64)
  • maximum output 30 PS (22 kW; 30 hp) at 6,500 rpm (R-2)
  • maximum output 36 PS (26 kW; 36 hp) at 7,000 rpm (R-2 SS)
  • maximum output 32 PS (24 kW; 32 hp) at 6,500 rpm (R-2 Sport Edition)

Used in the Subaru R-2 1969–1971 and Subaru Sambar 1970–1973

Water Cooled Two-stroke cycle

  • EK34: 356 cc Bore & Stroke = 61.5 x 60.0 mm
  • compression ratio = 6.5:1
  • maximum output 28 PS (21 kW; 28 hp) at 5,500 rpm (Sambar K71/K72/K81)
  • maximum output 32 PS (24 kW; 32 hp) at 6,000 rpm (R-2, Rex)
  • maximum output 35 PS (26 kW; 35 hp) at 6,500 rpm (Rex TS)
  • maximum output 36 PS (26 kW; 36 hp) at 7,000 rpm (R-2 GSS)
  • maximum output 37 PS (27 kW; 36 hp) at 6,500 rpm (Rex GSR)

Used in the Subaru R-2 1971.10-1972.07, Subaru Rex 1972.07-1973.10, Subaru Sambar 1973.02-1976.02

Four-strokes

Water Cooled four-stroke SOHC with SEEC emissions system (later SEEC-T), alloy block and head.[2]

  • EK21: Bore x Stroke mm = 66.0 x 52.4
  • Piston displacement = 358 cc
  • Compression ratio = 9.5:1
  • maximum output 28 PS (21 kW; 28 hp) at 7,500 rpm (Rex Van K42, Wagon K26, Rex sedan 75.12-76.05)
  • maximum output 31 PS (23 kW; 31 hp) at 8,000 rpm (73.10-75.12 Rex)

Used in the Subaru Rex K22 from 1973.10–1976.05, Subaru Sambar February 1976-May 1976

  • EK22: Bore x Stroke mm = 74.0 x 57.0, SEEC-T emissions system
  • Piston displacement = 490 cc
  • Compression ratio = 9.0:1
  • maximum output 28 PS (21 kW; 28 hp) (Rex 5 Van K43, Sambar 5 K75/76/85)
  • maximum output 31 PS (23 kW; 31 hp) at 6,500 rpm (Rex 5 K23)

Used in the Subaru Rex 1976.05–1977.05, Subaru Sambar 5 from May 1976 until March 1977

  • EK23: Bore x Stroke mm = 76.0 x 60.0
  • Piston displacement = 544 cc
  • Compression ratio = 8.5:1
  • Two valves per cylinder
  • maximum output 31 PS (23 kW; 31 hp) at 6,200 rpm (Rex)
  • maximum output 28 PS (21 kW; 28 hp) at 6,200 rpm (Rex Van, Sambar)
  • maximum output 31 PS (23 kW; 31 hp) at 6,000 rpm (Rex 2nd gen & Rex Combi)
  • maximum output 30 PS (22 kW; 30 hp) at 6,000 rpm (Rex 3rd gen)

Used in the Subaru Rex from 1977.05–1989, Subaru Sambar 1977–1990

  • EK23 ThreeValve: Bore x Stroke mm = 76.0 x 60.0
  • Piston displacement = 544 cc
  • Compression ratio = 9.0:1
  • Two valves per cylinder
  • maximum output 34 PS (25 kW; 34 hp) at 6,000 rpm (Sambar)
  • maximum output 36 PS (26 kW; 36 hp) at 7,000 rpm (Rex)

Used in the Subaru Rex Viki from 1986 to 1989, Subaru Sambar 1989–1990

  • EK23 Turbo Bore x Stroke mm = 76.0 x 60.0
  • Piston displacement = 544 cc
  • Compression ratio = 8.5:1
  • Two valves per cylinder
  • Hitachi-made 36 mm turbines
  • maximum output 41 PS (30 kW; 40 hp) at 6,000 rpm

Used in the Subaru Rex Combi (1983–1986)

  • EK23 ThreeValve Turbo Bore x Stroke mm = 76.0 x 60.0
  • Piston displacement = 544 cc
  • Compression ratio = 9.0:1
  • Three valves per cylinder (two intake, one exhaust)
  • Hitachi-made 36 mm turbines
  • maximum output 36 PS (26 kW; 36 hp) at 7000 rpm

Used in the Subaru Rex VX (1986–1989)

  • EK23 ThreeValve Supercharger Bore x Stroke mm = 76.0 x 60.0
  • Piston displacement = 544 cc
  • Compression ratio = 9.0:1
  • Three valves per cylinder (two intake, one exhaust)
  • Water-cooled intercooler
  • maximum output 55 PS (40 kW; 54 hp) at 6400 rpm

Used in the Subaru Rex Supercharger (1988–1989)

  • EK42 Bore x Stroke mm = 78.0 x 69.6
  • Piston displacement = 665 cc
  • Compression ratio = 9.5:1
  • Two valves per cylinder
  • maximum output 31 PS (23 kW; 31 hp) (Subaru 700)
  • maximum output 37 PS (27 kW; 36 hp) at 6400 rpm, low octane version
  • maximum output 35 PS (26 kW; 35 hp) at 6400 rpm (M70, Mini Jumbo, Sherpa), high octane version

Used in the Subaru Rex and Sambar/700 (export only, 1982–1989)

Three Cylinder[edit]

The EF series engine is a liquid-cooled three-cylinder, four-stroke, with SOHC. It is not compliant with Japanese Government regulations concerning displacement of kei cars with a current maximum limit of 660 cc. The EF appeared while the EK was being replaced by the EN05.

Subaru EF-12 Engine

Subaru EF engine[edit]

  • EF10: Bore x Stroke mm = 78.0 x 69.6
  • Piston displacement = 997 cc
  • Compression ratio = 9.5:1
  • Two valves per cylinder

SOHC 2V, 55 hp at 5,200 rpm 1984–1987 Subaru Justy

  • EF12:Bore x Stroke mm = 78.0 x 83.0
  • Piston displacement = 1189 cc
  • Compression ratio = 9.1:1
  • Three valves per cylinder

SOHC 3V, 66-73 hp 1987–1994 Subaru Justy

Four Cylinder[edit]

All of Subaru's four-cylinder engines (except the EN series) are liquid-cooled, horizontally opposed boxer four-strokes.

Subaru EA engine[edit]

The EA was used from 1966 until 1994 in most models. It is a basic two-valve-per-cylinder design with siamese ports and three main crankshaft bearings. Engines with overhead camshafts were installed with two timing belts, whereas vehicles with overhead valves used timing gears exclusively.

Subaru EA82 Engine

Subaru EE engine (diesel)[edit]

Subaru unveiled the world's first boxer diesel engine to be fitted in a passenger car at the Geneva autoshow in 2007. This 2.0L DOHC engine, called the EE20,[3] has 147 HP and 350Nm (258 lb-ft) of torque, five main bearings and was released in Europe in 2008. Engine was originally Euro-4 certified, updated to Euro-5 in 2008[4] and Euro-6 in 2015. 1998 ccm, Bore 86mm, Stroke 86mm

Subaru EJ engine[edit]

The EJ engine was introduced in the 1989 Subaru Legacy to replace the EA engines. It was designed from scratch with five main crankshaft bearings and four valves per cylinder and can be either SOHC or DOHC and one timing belt. The fifth digit is the only way to tell without seeing the engine.

Subaru EJ20H twin turbo
  • EJ15: 1483.4 cc SOHC, 1990–2003 JDM Subaru Impreza
  • EJ16: 90 hp at 5,600 rpm used in the 1993–2006 Subaru Impreza
  • EJ18: 1820 cc SOHC 110 hp at 5,600 rpm used in the 1993–1996 Subaru Impreza and Euro and JDM Subaru Legacy
  • EJ20: 1994.3 cc, available in Europe and Japan naturally aspirated at 115–190 hp and with a Turbo 220–280 hp used on Most Models, (2002–2005 WRX in the United States)
  • EJ22: 2212 cc, 135–280 hp used in the 1989–2001 Subaru Impreza and Subaru Legacy
  • EJ25: 2457 cc, 165–320 hp found in Most Models 1995–Present
  • EJ30: Special limited engine. Four were built by Subaru, but only 3 remain in working condition. There is no readily available technical or power information on these engines.

Generally the EJ-series can be divided into two versions: the Phase I engines (1989–1998) and the Phase II engines (1999–2010). The Phase II engines featured new cylinder heads and crankshafts with the thrust bearing located at crank bearing #5 instead of #3. The designation also changed from Phase I to Phase II. All Phase I engines have an alphanumerical suffix behind the standard EJXX designation, all Phase II engines have a numerical suffix behind the EJXX designation. Example:

Phase I: EJ15E, EJ15J, EJ16E, EJ18E, EJ20D, EJ20E, EJ20G, EJ20H, EJ20J, EJ20R, EJ20K, EJ22E, EJ221, EJ25D

Phase II: EJ151, EJ161, EJ181, EJ201, EJ202, EJ203, EJ204, EJ205, EJ206, EJ207, EJ208, EJ222, EJ251, EJ252, EJ253, EJ254, EJ255, EJ257

  • There's at least 1 exception from this rule - MY'07 EJ20F engine. Most likely F stands for bi-Fuel (engines prepared for LPG). This is unconfirmed info, based only on users' experience and observations.

Subaru EL engine[edit]

The (Japanese: Subaru EL engine) replaced the EJ15 and is used in the JDM Subaru Impreza 1.5R (series GD, GG, GE, GH) starting with model year 2006. It is based on the EJ engine and shares many components, like the crankshaft from the EJ25. It has DOHC cylinder heads with AVCS variable valve timing on the intake.[5][6]

  • Displacement: 1,498 cc
  • bore x stroke: 77.7 x 79 mm
  • compression ratio: 10.1
  • maximum horsepower: 110ps (81 kW) at 6,400 RPM
  • maximum torque: 14.7kgm (144Nm) at 3,200 rpm
  • AVCS

Subaru EN engine[edit]

The Subaru EN inline-four engine was introduced in 1988 to replace the straight-two EK series engine that was originally engineered as an air-cooled engine and then was modified as a water-cooled engine used in the 1969–1972 Subaru R-2. The EN is used in all kei cars and kei trucks currently in production by Subaru.

Subaru FA engine[edit]

Subaru FA20F

(Japanese: Subaru FA engine) The FA was developed from the FB engine, however, efforts to reduce weight while maintaining durability were the main goals of the FA engine. While the FA and FB engines share a common platform, the FA shares very little in dedicated parts with the FB engine, with a different block, head, connecting rods, and pistons.[7]

Subaru FB engine[edit]

Subaru FB16F

The FB-series (initially available as naturally-aspirated engines in 2.5 and 2.0 litre displacements) is the first new generation of boxer engine since the EJ-series. Subaru announced details of the FB engine on 23 September 2010.[8] By increasing piston stroke and decreasing piston bore, Subaru aimed to reduce emissions and improve fuel economy, while increasing and broadening torque output over the previous generation engine.

The FB has an all new block and head featuring dual overhead cams with intake and exhaust variable valve timing (AVCS - Active Valve Control System), and a timing chain that replaced the timing belt. Moving to chain-driven cams allows the valves to be placed at a more narrow angle to each other and shrinks the cylinder bore from 99.5 mm to 94. It results in less unburned fuel during cold start, thereby reducing emissions. Subaru also uses asymmetrical connecting rods like those in EZ36. The FB is only marginally heavier and has similar exterior dimensions compared to an EJ engine of equivalent displacement. In Jan 2011, Car and Driver was told direct injection would be added soon.[9]

Subaru claims a 28-percent reduction in friction losses, mainly due to lighter pistons and connecting rods.[9][10] The FB has a 10% improvement in fuel economy with the power coming on sooner and the torque band being broader.

Six Cylinder[edit]

All of Subaru's six-cylinder engines are of a liquid-cooled, Flat-6 four-stroke design.

Subaru ER engine[edit]

(Japanese: Subaru ER27) Subaru introduced its first six-cylinder engine in its Subaru XT sports car. This MPI SOHC 2-Valve engine was based on the EA82, with two cylinders added to the front.

  • ER27: 2672 cc SOHC, 145 hp at 5,200 rpm found in the 1987–1991 Subaru XT

Subaru EG engine[edit]

The (Japanese: Subaru EG33) engine was a direct replacement for the ER engine. The ER had been used only in the Subaru XT6, which was being replaced by the Subaru Alcyone SVX, and the company took the opportunity to create a new engine based on the more modern EJ rather than the EA engine series. As the ER27 was to the EA82, Subaru took the EJ22 design and created a six-cylinder version to make the new EG33. However, this four-valves-per-cylinder engine was DOHC, and valvetrain parts came from the not yet released EJ25D. Bore: 96.9 mm Stroke: 75 mm

Subaru EZ engine[edit]

Subaru EZ36

The (Japanese: Subaru EZ series) was introduced in 1999 in the Japanese market, in the Subaru Outback, and in 2000 in the United States market, also in the Outback. It is a flat-six, 24-valve, quad-cam engine with an aluminium block and heads. It is available in EZ30 and EZ36 variants. Though the second iteration of the EZ30D used from 2003 to 2009 was heavily updated from the early EZ30D used from 2001 to 2003, Subaru continued to identify it as EZ30D. "EZ30R" is a false engine code often used on the Internet for the later EZ30, but Subaru has never used it as an official engine code.[11] All EZ-series engines use dual timing chains and feature coil-on-plug ignition.

The 2000-2003 EZ30D used one exhaust port per head, a cable-actuated throttle, variable intake geometry, and a cast aluminium intake manifold. It was only available with an automatic transmission.

  • Displacement: 2999 cc DOHC
  • Bore: 89.2 mm
  • Stroke: 80 mm
  • Compression: 10.7:1
  • Power: 220 PS (162 kW; 217 hp) at 6000 rpm
  • Torque: 289 N⋅m (29 kg⋅m; 213 lb⋅ft) at 4400 rpm
  • Application:

The 2003-2007 EZ30D received new cylinder heads with 3 exhaust ports per head, AVLS, AVCS on the intake cams only, a drive-by-wire throttle, and a plastic intake manifold. It was available in manual and automatic unlike the original EZ30D.

  • Displacement: 2999 cc DOHC
  • Bore: 89.2 mm
  • Stroke: 80 mm
  • Compression: 10.7:1
  • Power: 245 PS (180 kW; 242 hp) at 6600 rpm
  • Torque: 297 N⋅m (30 kg⋅m; 219 lb⋅ft) at 4200 rpm
  • Application:

The EZ36D retains the plastic intake manifold, 3 exhaust ports per head, and drive-by-wire throttle of the later EZ30D, but loses AVLS while gaining AVCS for both intake and exhaust cams. The EZ36D also incorporates an asymmetrical connecting rod design shared with the FB series of engines and the EE20 diesel engine.

  • Displacement: 3629 cc DOHC
  • Bore: 92 mm
  • Stroke: 91 mm
  • Compression: 10.5:1
  • Power: 260 PS (191 kW; 256 hp) at 6000 rpm
  • Torque: 335 N⋅m (34 kg⋅m; 247 lb⋅ft) at 4400 rpm
  • Application:

See also[edit]

Notes[edit]

  1. ^ Michael Knowling (April 2, 2004). "2004 Engine Epic - Subaru Engines". AutoSpeed Magazine. Retrieved 2009-06-30. 
  2. ^ Braunschweig, Robert; et al., eds. (March 14, 1974). "Automobil Revue '74". 69. Berne, Switzerland: Hallwag SA: 483. 
  3. ^ "The New Subaru EE20 Boxer Turbo Diesel, In Detail". Jalopnik. 2008-04-23. Retrieved 2010-12-08. 
  4. ^ "EE20 Engine Info". Subaru Diesel Crew. 
  5. ^ Subaru Technical Journal, No. 34 published in June 2007
  6. ^ Subaru Technical Journal, No. 33 issue published in June, 2006
  7. ^ Mark Vaughn. "Subaru shows production version of the BRZ". Autoweek.com. 
  8. ^ "FHI Develops a New-generation Subaru Boxer Engine" (PDF). Fuji Heavy Industries. 23 September 2010. Retrieved 3 October 2010. 
  9. ^ a b Colwell, K.C. (January 2011). "Examining Subaru's New FB-series Flat-Four". Car and Driver. Hearst Corporation. Retrieved 15 April 2011. 
  10. ^ Bremner, Richard (17 January 2011). "Subaru Forester 2.0 XS review". Autocar. Haymarket Media Group. Retrieved 15 April 2011. 
  11. ^ "Official Subaru online parts catalogue". 
  12. ^ Reid, Matt. "Welcome to the Subaru Legacy Mini-Website". 3Keys Legacy. Retrieved 4 February 2018. 

External links[edit]