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Subaru EJ22G specs: 2.2L (135 ci) 4-cylinder, 96.9 x 75 mm (3.8150 x 2.9528 in) bore and stroke, 8:1 compression. Rated 160-280 hp. DOHC.
The Subaru EJ22G is oversquare — the 3.815" bore exceeds the 2.9528" stroke by 29.2% — a layout that favors airflow and RPM over leverage at the crank. The 2.9528" stroke does not reach 4,000 ft/min of mean piston speed until about 8,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 33.8 ci (553 cc).
8:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 37 engines in the EJ family, sitting between the 91.1 ci and 152 ci members. 2 factory variants share these dimensions, rated from 160 to 280 hp. Factory fitments include the Subaru Impreza 22B STI, Subaru Impreza 22B STi, Subaru Legacy Turbo and 1 other.
| Displacement | 135 ci / 2.2 L |
|---|---|
| Bore | 3.815" |
| Stroke | 2.9528" |
| Cylinders | 4 |
| Compression ratio | 8:1 |
| Bore/stroke ratio | 1.292 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 160–280 hp |
| Bore/stroke character | 1.292 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,953 ft/min — conservative for a street engine |
| Displacement per cylinder | 33.8 ci |
| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
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These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 160 hp | EJ22T, EJ22G |
| — | 280 hp | EJ22G |