See other engines in this family
Saab LP9 specs: 170 ci 6-cylinder, 89 x 74.8 mm (3.5039 x 2.9449 in) bore and stroke, 9.5:1 compression. Rated 255-280 hp, 2006–2009. Used in the Saab 9-3.
The Saab 170ci (LP9) is oversquare — the 3.5039" bore exceeds the 2.9449" stroke by 19.0% — a layout that favors airflow and RPM over leverage at the crank. The 2.9449" stroke does not reach 4,000 ft/min of mean piston speed until about 8,150 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 28.3 ci (464 cc).
9.5:1 is in the range that usually runs on pump premium.
5 factory variants share these dimensions, rated from 255 to 280 hp across 2006–2009.
| Displacement | 170 ci |
|---|---|
| Bore | 3.5039" |
| Stroke | 2.9449" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 9.5:1 * |
| Bore/stroke ratio | 1.19 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 255–280 hp |
| Years | 2006–2009 |
| Bore/stroke character | 1.190 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,945 ft/min — conservative for a street engine |
| Displacement per cylinder | 28.3 ci |
| Static compression | 9.5:1 — 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 |
|---|---|---|
| 2006 | — | LP9 |
| 2007 | — | LP9 |
| 2008 | 255 hp | LP9 |
| 2008 | 280 hp | LP9 |
| 2009 | — | LP9 |
1 factory vehicle, 2006–2009. Each year opens that model's engine table.