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Subaru 36 Dohc specs: 3.63L (221.5 ci) 6-cylinder, 92 x 91 mm (3.6220 x 3.5827 in) bore and stroke, 10.5:1 compression. Rated 256 hp. DOHC.
The Subaru 36 Dohc is close to square: 3.622" bore against 3.5827" stroke, within 1.1%, which splits the difference between a high-revving layout and a torque layout. The 3.5827" stroke puts mean piston speed at 4,000 ft/min around 6,700 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 36.9 ci (605 cc).
10.5:1 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 4 engines in the EZ family, the largest at 221.5 ci. Factory fitments include the Subaru Outback 3.6R, Subaru Legacy 3.6R, Subaru Tribeca and 5 others.
| Displacement | 221.5 ci / 3.63 L |
|---|---|
| Bore | 3.622" |
| Stroke | 3.5827" |
| Cylinders | 6 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.011 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 256 hp |
| Bore/stroke character | 1.011 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,583 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 36.9 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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