See other engines in this family
Subaru EG33 specs: 3.318L (202.5 ci) 6-cylinder, 96.9 x 75 mm (3.8150 x 2.9528 in) bore and stroke, 10:1 compression. Rated 230 hp. DOHC.
The Subaru EG33 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 6 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.
Factory fitments include the Subaru SVX.
| Displacement | 202.5 ci / 3.318 L |
|---|---|
| Bore | 3.815" |
| Stroke | 2.9528" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.292 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 230 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 |
Each link opens the calculator with this engine's specs already filled in.