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Subaru FA20 specs: 2.0L (122 ci) 4-cylinder, 86 x 86 mm (3.3858 x 3.3858 in) bore and stroke, 12.5:1 compression. Rated 200-205 hp, 2013–2020.
The Subaru FA20 is exactly square — 3.3858" bore and 3.3858" stroke are the same — which splits the difference between a high-revving layout and a torque layout. The 3.3858" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 30.5 ci (500 cc).
12.5:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 14 engines in the FA family, sitting between the 121.9 ci and 146.5 ci members. 12 factory variants share these dimensions, rated from 200 to 205 hp across 2013–2020.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.3858" |
| Cylinders | 4 |
| Compression ratio | 12.5:1 |
| Bore/stroke ratio | 1 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 200–205 hp |
| Years | 2013–2020 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2013 | FA20 net | 200 @ 7000 | 151 lb-ft @ 6400 | 12.5:1 |
| 2014 | FA20 net | 200 @ 7000 | 151 lb-ft @ 6400 | 12.5:1 |
| 2015 | FA20 net | 200 @ 7000 | 151 lb-ft @ 6400 | 12.5:1 |
| 2016 | FA20 net | 200 @ 7000 | 151 lb-ft @ 6400 | 12.5:1 |
| 2017 | FA20 net | 200 @ 7000 | 151 lb-ft @ 6400 | 12.5:1 |
| 2017 | FA20 net | 205 @ 7000 | 156 lb-ft @ 6400 | 12.5:1 |
| 2018 | FA20 net | 200 @ 7000 | 151 lb-ft @ 6400 | 12.5:1 |
| 2018 | FA20 net | 205 @ 7000 | 156 lb-ft @ 6400 | 12.5:1 |
| 2019 | FA20 net | 200 @ 7000 | 151 lb-ft @ 6400 | 12.5:1 |
| 2019 | FA20 net | 205 @ 7000 | 156 lb-ft @ 6400 | 12.5:1 |
| 2020 | FA20 net | 200 @ 7000 | 151 lb-ft @ 6400 | 12.5:1 |
| 2020 | FA20 net | 205 @ 7000 | 156 lb-ft @ 6400 | 12.5:1 |
Factory specification sheet.
| Bore/stroke character | 1.000 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,386 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
| Static compression | 12.5:1 — high enough that pump premium or better is normally required |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2013 | 200 hp | FA20 |
| 2014 | 200 hp | FA20 |
| 2015 | 200 hp | FA20 |
| 2016 | 200 hp | FA20 |
| 2017 | 200 hp | FA20 |
| 2017 | 205 hp | FA20 |
| 2018 | 200 hp | FA20 |
| 2018 | 205 hp | FA20 |
| 2019 | 200 hp | FA20 |
| 2019 | 205 hp | FA20 |
| 2020 | 200 hp | FA20 |
| 2020 | 205 hp | FA20 |
1 factory vehicle, 2013–2020. Each year opens that model's engine table.