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Subaru 22 Turbo specs: 2.2L (134.9 ci) 4-cylinder, 96.9 x 75 mm (3.8150 x 2.9528 in) bore and stroke, 8:1 compression. Rated 160 hp. SOHC.
The Subaru 22 Turbo 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 33.7 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. Factory fitments include the Subaru Legacy Turbo, Subaru Legacy Sport Sedan, Subaru Impreza 22B STI.
| Displacement | 134.9 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 | SOHC |
| Fuel type | gas |
| Advertised HP | 160 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 | 33.7 ci |
| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
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