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Subaru EJ222 specs: 2.2L (135 ci) 4-cylinder, 96.9 x 75 mm (3.8150 x 2.9528 in) bore and stroke, 10:1 compression. Rated 142 hp. Rod ratio and piston speed.
The Subaru EJ222 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).
10:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 37 engines in the EJ family, sitting between the 91.1 ci and 152 ci members. Factory fitments include the Subaru Impreza, Subaru Legacy.
| Displacement | 135 ci / 2.2 L |
|---|---|
| Bore | 3.815" |
| Stroke | 2.9528" |
| Cylinders | 4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.292 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 142 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 | 10:1 — in the range that usually runs on pump premium |
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