See other engines in this family
Oldsmobile LX5 specs: 213 ci (3.5L) 6-cylinder, 3.504 x 3.661 in (89 x 93 mm) bore and stroke, 10.3:1 compression. Rated 215 hp. Rod ratio and piston speed.
The Oldsmobile Shortstar (LX5) 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 35.5 ci (582 cc).
10.3:1 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.
2 factory variants share these dimensions, rated at 215 hp. Factory fitments include the Oldsmobile Intrigue, Oldsmobile Aurora, Aurora and 1 other.
| Displacement | 213 ci / 3.5 L |
|---|---|
| Bore | 3.5039" |
| Stroke | 3.6614" |
| Cylinders | 6 |
| Compression ratio | 10.3:1 |
| Bore/stroke ratio | 0.957 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 215 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 | 35.5 ci |
| Static compression | 10.3:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 215 hp | LX5 |
| — | 215 hp | LX5 |