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Subaru 16 NA specs: 1.6L (97.5 ci) 4-cylinder, 87.9 x 65.8 mm (3.4606 x 2.5906 in) bore and stroke, 9.7:1 compression. Rated 90 hp. SOHC.
The Subaru 16 NA is oversquare — the 3.4606" bore exceeds the 2.5906" stroke by 33.6% — a layout that favors airflow and RPM over leverage at the crank. The 2.5906" stroke does not reach 4,000 ft/min of mean piston speed until about 9,250 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 (399 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 (Europe), Subaru Impreza.
| Displacement | 97.5 ci / 1.6 L |
|---|---|
| Bore | 3.4606" |
| Stroke | 2.5906" |
| Cylinders | 4 |
| Compression ratio | 9.7:1 |
| Bore/stroke ratio | 1.336 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 90 hp |
| Bore/stroke character | 1.336 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,591 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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