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Saturn L66 specs: 212 ci (3.5L) 6-cylinder, 3.504 x 3.661 in (89 x 93 mm) bore and stroke, 10:1 compression. Rated 250 hp. SOHC. Rod ratio and piston speed.
The Saturn Honda J-Series (L66) is close to square: 3.5039" bore against 3.6614" stroke, within 4.3%, which splits the difference between a high-revving layout and a torque layout. The 3.6614" stroke puts mean piston speed at 4,000 ft/min around 6,550 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 35.3 ci (579 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 Saturn Vue.
| Displacement | 212 ci / 3.5 L |
|---|---|
| Bore | 3.5039" |
| Stroke | 3.6614" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.957 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 250 hp |
| Bore/stroke character | 0.957 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,661 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 35.3 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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