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Subaru EJ16 specs: 1.6L (97.6 ci) 4-cylinder, 84 x 72 mm (3.3071 x 2.8346 in) bore and stroke, 9.7:1 compression. Rated 90 hp. Rod ratio and piston speed.
The Subaru EJ16 is oversquare — the 3.3071" bore exceeds the 2.8346" stroke by 16.7% — a layout that favors airflow and RPM over leverage at the crank. The 2.8346" stroke does not reach 4,000 ft/min of mean piston speed until about 8,450 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.4 ci (400 cc).
9.7:1 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.
| Displacement | 97.6 ci / 1.6 L |
|---|---|
| Bore | 3.3071" |
| Stroke | 2.8346" |
| Cylinders | 4 |
| Compression ratio | 9.7:1 |
| Bore/stroke ratio | 1.167 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 90 hp |
| Bore/stroke character | 1.167 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,835 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.4 ci |
| Static compression | 9.7:1 — in the range that usually runs on pump premium |
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