Subaru FA engine

The Subaru FA engine is a gasoline boxer-4 engine used in Subaru and Toyota automobiles. It is a derivative of 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.

Subaru FA engine
Overview
ManufacturerSubaru
Production2012–present
Layout
Displacement
  • 2.0 L (1,998 cm3)
  • 2.4 L (2,387 cm3)
Cylinder bore
  • 86 mm (3.39 in)
  • 94 mm (3.70 in)
Piston stroke86 mm (3.39 in)
ValvetrainDOHC 4 valves x cyl. with AVCS
Compression ratio10.6:1, 12.5:1
RPM range
Redline6700–7400 rpm
Combustion
TurbochargerOptional with intercooler
Fuel systemFuel injection, Direct injection
Fuel typePetrol/gasoline
Cooling systemWater-cooled
Output
Power output200–300 PS (147–221 kW; 197–296 hp)
Torque output205–400 N⋅m (151–295 lb⋅ft; 21–41 kg⋅m)
Chronology
PredecessorSubaru FB engine (parent)

Development

The FA series engine was developed for the Subaru BRZ and the first FA engine, the FA20D, was designed to be mounted as low as possible and to minimize the polar moment of the chassis to improve dynamic response and handling.[1][2] The FA engine features a shallower oil pan and shorter intake manifold to reduce overall engine height compared to the Subaru FB engine.[3] The FA and FB engines share few parts.[2]

A direct injection-only turbo variant of the FA20, the FA20F, was introduced in late 2012 with the 2012 Legacy GT (for the Japanese market) and in the United States, the 2014 model year Subaru Forester. Compression ratio for the turbo engine falls to 10.6:1 from 12.5:1 for the FA20D. A revised variant of the FA20F was introduced for the 2015 model year Subaru WRX; in this application, the camshafts, rocker arms, boost pressure, intercooler, and exhaust were revised to increase peak output.[4]

FA20

Compared to the FB20 engine, which is undersquare with an 84 mm × 90 mm (3.31 in × 3.54 in) bore and stroke for 2.0 L (1,995 cm3) swept displacement, the FA20 is perfectly square with an 86 mm × 86 mm (3.39 in × 3.39 in) bore and stroke for 2.0 L (1,998 cm3) swept displacement. The 86 mm (3.39 in) bore and stroke are also reminders of the heritage Toyota model AE86.

FA20D
Subaru FA20D

The FA20D features both direct and port injection (Toyota's D-4S injection system) and Subaru AVCS variable valve timing system. It is used in the Subaru BRZ, and is identified by a Toyota engine family code known as the 4U-GSE, which is installed in the Toyota 86 and the Scion FR-S.[5] According to Subaru, 0W-20 oil is recommended.

Wards Auto put the FA20D on their "10 Best Engines" list for 2013.[6]

  • Bore: 86 mm (3.39 in)
  • Stroke: 86 mm (3.39 in)
  • Displacement: 2.0 L (1,998 cm3)
  • Compression Ratio: 12.5:1
  • Application: 2012-2016 Subaru BRZ/Toyota GT86
    • Power: 197 hp (147 kW; 200 PS) at 7,000 RPM
    • Torque: 151 lb⋅ft (205 N⋅m; 21 kg⋅m) at 6,400-6,600 RPM
  • Application: 2017-2020 Subaru BRZ/Toyota GT86 (manual transmission)[7]
    • Power: 205 hp (153 kW; 208 PS) at 7,000 RPM
    • Torque: 156 lb⋅ft (212 N⋅m; 22 kg⋅m) at 6,400 RPM

FA20F
Subaru FA20F

A version with Subaru's own direct fuel injection and twin-scroll turbocharger was introduced in 2012.[8] The FA20F was named to the Wards Auto "10 best engines" list in 2015[9] and 2016.[10]

  • Displacement: 2.0 L (1,998 cm3)
  • Bore: 86 mm (3.39 in)
  • Stroke: 86 mm (3.39 in)
  • Compression Ratio: 10.6:1[11]
  • Assembly: Oizumi, Japan[11]
  • Firing Order: 1-3-2-4[11]
  • 2012+ JDM Subaru Legacy 2.0GT DIT, 2014+ Subaru Levorg and 2015+ JDM Subaru WRX S4
    • Power: 296 hp (221 kW; 300 PS) at 5,600 RPM
    • Torque: 295 lb⋅ft (400 N⋅m; 41 kg⋅m) at 2,000-4,800 RPM
  • 2014-2018 USDM Subaru Forester badged as Forester XT:
    • Power: 250 hp (186 kW; 253 PS) at 5,600 RPM
    • Torque: 258 lb⋅ft (350 N⋅m; 36 kg⋅m) at 2,000-4,800 RPM
  • 2014-2018 JDM Subaru Forester badged as Forester XT:
    • Power: 276 hp (206 kW; 280 PS) at 5,600 RPM
    • Torque: 258 lb⋅ft (350 N⋅m; 36 kg⋅m) at 2,000-5,200 rpm
  • 2015+ USDM Subaru WRX:
    • Power: 268 hp (200 kW; 272 PS) at 5,600 RPM
    • Torque: 258 lb⋅ft (350 N⋅m; 36 kg⋅m) at 2,000-5,200 RPM
    • Rev Limit: 6700 RPM[11]
Subaru FA24F

FA24

FA24F

The FA24F was introduced in 2018 initially for the 2019 model year Subaru Ascent. The bore is increased compared to prior FA20 engines, increasing displacement to 2.4 L (2,387 cm3).[12] The engine has an all aluminum head and block in order to keep weight and warm-up times low.[13] Direct injection and a turbocharger are used to provide output comparable to a 6-cylinder naturally aspirated engine, and the FA24 uses "regular" (87 AKI) fuel.[14] At the 2019 Chicago Auto Show, Subaru unveiled the 2020 model year Subaru Legacy sedan, available starting in fall 2019 and featuring the FA24 as the uplevel engine option.[15] The 2020 model year Subaru Outback also featured the FA24 as the uplevel option.[16]

  • Displacement: 2.4 L (2,387 cm3)
  • Bore: 94 mm (3.70 in)
  • Stroke: 86 mm (3.39 in)
  • Compression Ratio: 10.6:1
  • 2019+ USDM Subaru Ascent, 2020+ USDM Subaru Legacy badged as Legacy XT, and 2020+ USDM Subaru Outback badged as Outback XT
    • Power: 260 hp (194 kW; 264 PS) at 5,600 RPM
    • Torque: 277 lb⋅ft (376 N⋅m; 38 kg⋅m) at 2,000-4,800 RPM

References
  1. "Subaru BRZ Concept - STI - to Debut at Los Angeles Auto Show" (Press release). Subaru Global. 16 November 2011. Retrieved 28 February 2018.
  2. Gall, Jared (December 2011). "2013 Subaru BRZ". Car and Driver. Retrieved 28 February 2018.
  3. "Subaru Unveils "SUBARU BRZ"" (Press release). Subaru Global. 30 November 2011. Retrieved 28 February 2018.
  4. Tate, James (November 2013). "2015 Subaru WRX: Rex Who's Back?". Car and Driver. Retrieved 28 February 2018.
  5. Mark Vaughn. "Subaru shows production version of the BRZ". Autoweek.com.
  6. Witzenburg, Gary (4 February 2013). "High-Revving Subaru Boxer Engine Is Crowd Pleaser". Wards Auto. Retrieved 28 February 2018.
  7. Jacquot, Josh (October 2016). "2017 Subaru BRZ Manual". Car and Driver. Retrieved 28 February 2018.
  8. "Subaru Legacy and Outback in Japan to Receive Minor Facelift; Fitted with New Generation 2.5 litre NA and 2.0 liter Direct Injection Turbo Boxer Engines" (Press release). Fuji Heavy Industries, Ltd. 8 May 2012. Retrieved 28 February 2018.
  9. Witzenburg, Gary (9 July 2015). "Subaru's Lightweight Boxer Punches Above Weight". Wards Auto. Retrieved 28 February 2018.
  10. Murphy, Tom (7 January 2016). "2016 Winner: Subaru 2.0L Turbocharged DOHC H-4". Wards Auto. Retrieved 28 February 2018.
  11. "FA20 DIT Engine Specs". Come and Drive It. Retrieved 12 March 2018.
  12. Gilboy, James (16 February 2018). "Meet Subaru's new FA24 engine". The Drive. Retrieved 27 February 2018.
  13. https://www.thedrive.com/news/18562/meet-subarus-new-fa24-boxer-engine
  14. "Subaru debuts all-new Ascent 3-row SUV" (Press release). Subaru. 29 November 2017. Retrieved 1 March 2018.
  15. "World Premier of all-new 2020 Subaru Legacy sedan" (Press release). Subaru. February 8, 2019. Retrieved 4 April 2019.
  16. "World Premier of All-New 2020 Subaru Outback" (Press release). Subaru Corporation. April 17, 2019. Retrieved 17 April 2019.

(Japanese: Subaru FA engine)

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