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Oldsmobile LX5 specs: 212 ci (3.5L) 6-cylinder, 3.524 x 3.622 in (89.5 x 92 mm) bore and stroke, 9.3:1 compression. Rated 215 hp. Rod ratio and piston speed.
The Oldsmobile Northstar (LX5) is close to square: 3.5236" bore against 3.622" stroke, within 2.7%, which splits the difference between a high-revving layout and a torque layout. The 3.622" stroke puts mean piston speed at 4,000 ft/min around 6,650 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).
9.3:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
Factory fitments include the Intrigue, Aurora.
| Displacement | 212 ci / 3.5 L |
|---|---|
| Bore | 3.5236" |
| Stroke | 3.622" |
| Cylinders | 6 |
| Compression ratio | 9.3:1 |
| Bore/stroke ratio | 0.973 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 215 hp |
| Bore/stroke character | 0.973 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,622 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 35.3 ci |
| Static compression | 9.3:1 — low by modern standards, generally happy on regular pump fuel |
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