Subaru uses a four or five character code to identify all of their engines.[1] As of August 2022 these are the engines presently in models sold by Subaru


Subaru EK engine

The late 1980s EK23, with three valves per cylinder

The EK series was an inline twin cylinder engine. Early versions were air-cooled two-stroke cycle, 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, using the SEEC emissions system (later SEEC-T), with an alloy block and head.[2]

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

Subaru EK engine summary
Cooling Stroke Name Displacement Bore × Stroke Output Compression Ratio Applications
Air Two EK31 356 cm3 (21.7 cu in) 61.5 mm × 60.0 mm (2.42 in × 2.36 in) 16 PS (12 kW; 16 hp) at 4,500 rpm May 1958Feb 1960 6.5:1 Subaru 360 (1958–68)
Sambar (1961–70)
18 PS (13 kW; 18 hp) at 4,700 rpm Feb 1960Jul 1964
20 PS (15 kW; 20 hp) at 5,000 rpm Jul 1964Aug 1968
EK51 423 cm3 (25.8 cu in) 67.0 mm × 60.0 mm (2.64 in × 2.36 in) 23 PS (17 kW; 23 hp) at 5,000 rpm Subaru 450 (MAIA) Japan & North America (1960–66)
EK32 356 cm3 (21.7 cu in) 61.5 mm × 60.0 mm (2.42 in × 2.36 in) 25 PS (18 kW; 25 hp) at 5,500 rpm Aug 19681970 7.5:1 Subaru 360 and 360 Young SS (1968-70)
36 PS (26 kW; 36 hp) at 7,000 rpm Nov 19681970
EK33 26 PS (19 kW; 26 hp) at 5,800 rpm R-2 Van K41, Sambar K55/K64 6.5:1 Subaru R-2 (1969–71)
Subaru Sambar (1970–73)
30 PS (22 kW; 30 hp) at 6,500 rpm R-2
36 PS (26 kW; 36 hp) at 7,000 rpm R-2 SS 7.5:1
32 PS (24 kW; 32 hp) at 6,500 rpm R-2 Sport Edition
Water EK34 28 PS (21 kW; 28 hp) at 5,500 rpm Sambar K71/K72/K81 6.5:1 Subaru R-2 1971.10-1972.07
Subaru Rex 1972.07-1973.10
Subaru Sambar 1973.02-1976.02
32 PS (24 kW; 32 hp) at 6,000 rpm R-2, Rex
35 PS (26 kW; 35 hp) at 6,500 rpm Rex TS
36 PS (26 kW; 36 hp) at 7,000 rpm R-2 GSS
37 PS (27 kW; 36 hp) at 6,500 rpm Rex GSR
Four EK21 358 cm3 (21.8 cu in) 66.0 mm × 52.4 mm (2.60 in × 2.06 in) 31 PS (23 kW; 31 hp) at 8,000 rpm Rex 73.10-75.12 9.5:1 Subaru Rex K22 1973.10–1976.05
Subaru Sambar 1976.02–1976.05
28 PS (21 kW; 28 hp) at 7,500 rpm Rex Van K42, Wagon K26, Rex sedan 75.12-76.05
EK22[a] 490 cm3 (30 cu in) 74.0 mm × 57.0 mm (2.91 in × 2.24 in) 28 PS (21 kW; 28 hp) Rex 5 Van K43, Sambar 5 K75/76/85 9.0:1 Subaru Rex 1976.05–1977.05
Subaru Sambar 5 1976.05–1977.03
31 PS (23 kW; 31 hp) at 6,500 rpm Rex 5 K23
EK23 (2V)[b] 544 cm3 (33.2 cu in) 76.0 mm × 60.0 mm (2.99 in × 2.36 in) 31 PS (23 kW; 31 hp) at 6,200 rpm Rex 8.5:1 Subaru Rex (1977.05–1989)
Subaru Sambar (1977–90)
28 PS (21 kW; 28 hp) at 6,200 rpm Rex Van, Sambar
31 PS (23 kW; 31 hp) at 6,000 rpm Rex 2nd gen & Rex Combi
30 PS (22 kW; 30 hp) at 6,000 rpm Rex 3rd gen
EK23 (3V)[c] 34 PS (25 kW; 34 hp) at 6,000 rpm Sambar 9.0:1 Subaru Rex Viki (1986–89)
Subaru Sambar (1989–90)
36 PS (26 kW; 36 hp) at 7,000 rpm Rex
EK23 (2V-T)[b][d] 41 PS (30 kW; 40 hp) at 6,000 rpm 8.5:1 Subaru Rex Combi (1983–86)
EK23 (3V)[c][d] 36 PS (26 kW; 36 hp) at 7,000 rpm 9.0:1 Subaru Rex VX (1986–89)
EK23 (SC)[c][e] 55 PS (40 kW; 54 hp) at 6,400 rpm Subaru Rex Supercharger (1988–89)
EK42[b] 665 cm3 (40.6 cu in) 78.0 mm × 69.6 mm (3.07 in × 2.74 in) 31 PS (23 kW; 31 hp) 700 9.5:1 Subaru Rex and Sambar/700 (export only, 1982–89)
37 PS (27 kW; 36 hp) at 6,400 rpm low octane version
35 PS (26 kW; 35 hp) at 6,400 rpm M70, Mini Jumbo, Sherpa (high octane version)
  1. ^ SEEC-T emissions system
  2. ^ a b c Two valves per cylinder
  3. ^ a b c Three valves per cylinder: two intake, one exhaust
  4. ^ a b Turbocharged: Hitachi-made, 36 mm turbines
  5. ^ Supercharged, water-cooled intercooler


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

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

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


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

Subaru EA engine

The EA was used from 1966 until 1994 in most models. It is a basic two-valve-per-cylinder design with siamese ports, or one port that is directly next to another, and three main crankshaft main 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)

Subaru EE20 (2008)

Subaru unveiled the world's first boxer diesel engine to be fitted in a passenger car at the Geneva Auto Show in 2007.[3] This 2.0L DOHC engine, designated the EE20,[4] has an output of 110 kW (150 PS; 150 hp) at 3600 rpm and develops 350 N⋅m (36 kg⋅m; 260 lb⋅ft) of torque at 1800 rpm,[5][6] with a redline of 4750 rpm.[7] The engine has a total displacement of 1,998 cc (122 cu in) from a square 86 mm × 86 mm (3.4 in × 3.4 in) bore x stroke with a compression ratio of 16.3:1 and uses five main bearings. The EE20 shares a bore pitch dimension and assembly line with the EZ30 at the Ooizumi Factory; compared to the contemporaneous gasoline EJ20, which has a similar displacement, the EE20 is 61.3 mm (2.41 in) shorter.[5]

The common rail solenoid injector is manufactured by Denso and operates at 180 MPa (26,000 psi).[5] The IHI variable geometry turbo is mounted under the right side of the engine, close to the exhaust manifold, reducing turbo lag.[7][5] For the Legacy 2.0D, Subaru claimed consumption improved by 15 to 20% (ranging from 6.4 to 5.6 L/100 km (37 to 42 mpg‑US)) and that CO
emissions fell from 202 to 148 g/km (0.72 to 0.53 lb/mi) compared to the similar model with a gasoline engine.[7][8]

Fuji Heavy Industries (FHI) spent three years starting in fall 2005 developing the EE20 after concluding the marque needed a diesel engine to compete in Europe.[8] Details about the engine were first released in February 2008,[5] after an additional preview at Frankfurt in 2007,[9] and an official announcement of applications was made at Geneva in March 2008.[10][11]

The EE20 was originally released with Euro-4 emissions compliance; an oxidation catalyst and diesel particulate filter are mounted close to the turbo, using heat from exhaust gases, and the exhaust gas recirculation system is water-cooled to meet regulations.[5] The compliance was soon updated to Euro-5[12] and Euro-6 in 2015.


Per the March 2008 announcement at Geneva, the EE20 was sold in Legacy (wagon and sedan) and Outback vehicles for the European market; the diesel was only offered with a manual transmission at first, and the clutch and flywheel were specifically modified for diesel use.[5] In September 2008, FHI announced the EE20 would be available as a slightly modified variant (the diesel particulate filter was now closed) in Forester and Impreza models sold in Europe starting that fall. For the Forester, output was reduced slightly to 108 kW (147 PS; 145 bhp).[13]

The EE20 was offered with the Impreza XV at that model's launch in 2010.[14] The Subaru continuously variable transmission (branded Lineartronic) was offered as an option for EE20-equipped Outback models starting in 2013,[15] and sales of the Lineartronic EE20 Outback would start in Australia later in 2013.[16] At Geneva 2013, the diesel boxer was combined with three electric motors to form the hybrid powertrain of the Subaru VIZIV Concept.[17] The Lineartronic EE20 powertrain was added to the Forester in 2015.[18]

In 2016, citing increasingly stringent emissions standards, the project manager for the Impreza stated that further development of the EE20 had been halted.[19] In September 2017, Subaru announced production of diesel automobiles would end by 2020; at the time, sales were approximately 15,000 diesel-powered cars annually in Europe and Australia. The capacity gained would be used to start producing plug-in hybrids in 2018 and electric vehicles by 2021.[20] At Geneva in March 2018, Subaru UK confirmed its parent company's plans to discontinue diesel production, but had enough stock on hand to meet projected demand through the end of 2018.[21]

Subaru EJ engine

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 EJ20G twin turbo

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, EJ20B, 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, EJ20X, EJ20Y

Subaru EL engine/Boxer type 3

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.[22][23]

Subaru EN engine

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, then modified as a water-cooled engine used in the 1969–1972 Subaru R-2. The EN was used in all kei cars and kei trucks in production by Subaru up until 2012.

Subaru FA engine

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.[24]

Subaru FB engine

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.[25] 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.[26] In 2019, Direct Injection was added to FB engines used in the 2018 Crosstrek, 2019 Forester and the 2020 Legacy and Outback models.

Subaru claims a 28-percent reduction in friction losses, mainly due to lighter pistons and connecting rods.[26][27] The FB has a 10% improvement in fuel economy with the power coming on sooner and the torque band being broader.

Subaru CB engine

This section needs expansion. You can help by adding to it. (August 2020)

The CB engine was first introduced in 2020 with the second-generation Levorg.[28][29] According to Subaru, CB stands for Concentration/Compact Boxer.[30] The first engine in the series is designated CB18, a 1.8 litre dual overhead cam 16-valve engine featuring dual AVCS with gasoline direct injection and a turbocharger. Bore and stroke are 80.6 mm × 88.0 mm (3.17 in × 3.46 in), respectively, and the compression ratio is 10.4:1. Rated output power is 130 kW (180 PS; 170 hp) at 5,200–5,600 RPM and torque is 300 N⋅m (31 kg⋅m; 220 lb⋅ft) at 1,600–3,600 RPM.[31]

Compared to the FB16 used in the previous generation of the Levorg, the CB18 offers decreased fuel consumption (16.6 km/L (39 mpg‑US) for the CB18 and 16.0 km/L (38 mpg‑US) for the FB16, both using the JC08 mode) and increased torque (300 N⋅m (31 kg⋅m; 220 lb⋅ft) for the CB18 and 250 N⋅m (25 kg⋅m; 180 lb⋅ft) for the FB16). In addition, the CB16 achieves its peak torque at a lower engine speed. The CB18 also is shorter and lighter than the FB16; the bore pitch (centerline to centerline spacing between adjacent cylinders) has decreased from 113.0 to 98.6 mm (4.45 to 3.88 in), the overall crank length has decreased from 350.5 to 315.9 mm (13.80 to 12.44 in), and engine weight has been reduced by 14.6 kg (32 lb).[32] For the first time in a Subaru engine, the centerlines of the cylinder bores do not intersect with the crankshaft axis to reduce friction during the piston downstroke; instead, there is a crank offset of 8 mm (0.31 in). Overall thermal efficiency is 40% due to the adoption of lean-burn combustion with an excess air ratio (λ) of 2.[32]


Main article: Subaru six-cylinder engines

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

Subaru ER engine

(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.

Subaru EG engine

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

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.[33] 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.

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.

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.

See also


  1. ^ Michael Knowling (April 2, 2004). "2004 Engine Epic - Subaru Engines". AutoSpeed Magazine. Archived from the original on 2008-08-25. Retrieved 2009-06-30.
  2. ^ Braunschweig, Robert; et al., eds. (March 14, 1974). "Automobil Revue '74". 69. Berne, Switzerland: Hallwag SA: 483. ((cite journal)): Cite journal requires |journal= (help)
  3. ^ "Exhibition Outlines of the 77th Geneva International Motor Show: FHI to unveil the "SUBARU BOXER TURBO DIESEL" engine" (Press release). Fuji Heavy Industries Ltd. 8 February 2007. Retrieved 28 August 2018.
  4. ^ Wojdyla, Ben (2008-04-23). "The New Subaru EE20 Boxer Turbo Diesel, In Detail". Jalopnik. Retrieved 2010-12-08.
  5. ^ a b c d e f g Momota, Kenji (22 February 2008). "FHI Details World's First Horizontally Opposed Diesel for Passenger Cars". TechOn. Nikkei Business Publications. Archived from the original on 12 February 2018.
  6. ^ "Technology: Performance — The Subaru Boxer Engine". Subaru Global. Archived from the original on 8 April 2016. Retrieved 8 April 2016.
  7. ^ a b c Harima, Kenji (September 2008). "Subaru Boxer Diesel: First Four-Cylinder Horizontally-Opposed Diesel Engine" (PDF). MTZ. Vol. 69. pp. 38–45. Retrieved 28 August 2018.
  8. ^ a b "Feature Article 4: Subaru's Approaches to Prevention of Global Warming, and Efforts in Product Development" (PDF). Fuji Heavy Industries Ltd. 2009. p. 17. Retrieved 28 August 2018.
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  10. ^ "Exhibition Outlines of the 78th Geneva International Motor Show: The World's First SUBARU BOXER DIESEL debuts with the Legacy/Outback" (Press release). Fuji Heavy Industries Ltd. 8 February 2008. Retrieved 28 August 2018.
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  12. ^ "EE20 Engine Info". Subaru Diesel Crew. Archived from the original on 2016-03-15. Retrieved 2015-03-17.
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  14. ^ "Exhibition Outline of the 80th Geneva International Motor Show" (Press release). Fuji Heavy Industries Ltd. 5 February 2010. Retrieved 28 August 2018.
  15. ^ "Exhibition Outline of the 83rd Geneva International Motor Show" (Press release). Fuji Heavy Industries Ltd. 7 February 2013. Retrieved 28 August 2018.
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  18. ^ "Exhibition Outline of the 85th Geneva International Motor Show" (Press release). Fuji Heavy Industries Ltd. 6 February 2015. Retrieved 28 August 2018.
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  21. ^ Milne, Stuart (7 March 2018). "End of the road for diesel Subarus". AutoExpress. Retrieved 28 August 2018.
  22. ^ Subaru Technical Journal, No. 34 published in June 2007
  23. ^ Subaru Technical Journal, No. 33 issue published in June, 2006
  24. ^ Mark Vaughn. "Subaru shows production version of the BRZ". Archived from the original on 2011-12-03. Retrieved 2011-12-01.
  25. ^ "FHI Develops a New-generation Subaru Boxer Engine" (PDF). Fuji Heavy Industries. 23 September 2010. Retrieved 3 October 2010.
  26. ^ a b Colwell, K.C. (January 2011). "Examining Subaru's New FB-series Flat-Four". Car and Driver. Hearst Corporation. Retrieved 15 April 2011.
  27. ^ Bremner, Richard (17 January 2011). "Subaru Forester 2.0 XS review". Autocar. Haymarket Media Group. Retrieved 15 April 2011.
  28. ^ Stocksdale, Joel (August 20, 2020). "Subaru Levorg, also known as the WRX's wagon cousin, revealed in production form". Autoblog. Retrieved 2 September 2020.
  29. ^ Lye, Gerard (August 21, 2020). "2020 Subaru Levorg officially debuts in Japan – SGP platform; new 1.8L turbo boxer engine and EyeSight X". Retrieved 2 September 2020.
  30. ^ Tanikawa, Kiyoshi (August 28, 2020). "スバル、新開発水平対向エンジン「CB18型」の疑問点を確認 「EJ20時代の強度剛性思想を採用」" [Subaru answers questions about the newly developed boxer engine 'CB18': 'Adopts the strength and rigidity concept of the EJ20 era']. Car Watch. Retrieved 6 April 2021.
  31. ^ "スペック" [Specifications]. Subaru of Japan. Retrieved 2 September 2020.
  32. ^ a b Tanikawa, Kiyoshi (August 27, 2020). "スバル、新型レヴォーグのCB18エンジンは熱効率40% λ=2のリーン燃焼やオフセットシリンダー採用" [Subaru's new Levorg CB18 engine uses lean combustion with a thermal efficiency of 40%, λ=2, and an offset cylinder]. Car Watch. Retrieved 6 April 2021.
  33. ^ "2009 Subaru Outback 3.0L 5AT Limited Engine assembly. Cooling - 10100BR310 - Genuine Subaru Part".
  34. ^ Reid, Matt. "Welcome to the Subaru Legacy Mini-Website". 3Keys Legacy. Retrieved 4 February 2018.
  35. ^ a b "Outback 3.0R a new Subaru star" (Press release). Subaru of Australia. October 16, 2003. Archived from the original on January 6, 2004.
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  37. ^ "Exhibition outlines of the Mondial de l'Automobile 2004 (Paris Motor Show)" (Press release). Subaru Global Media. August 20, 2004. Retrieved 23 July 2019.