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Saab B212 specs: 129 ci 4-cylinder, 93 x 78 mm (3.6614 x 3.0709 in) bore and stroke, 10.1:1 compression. Rated 140 hp, 1991–1993. Used in the Saab 900.
The Saab B212 is oversquare — the 3.6614" bore exceeds the 3.0709" stroke by 19.2% — a layout that favors airflow and RPM over leverage at the crank. The 3.0709" stroke does not reach 4,000 ft/min of mean piston speed until about 7,800 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 32.3 ci (528 cc).
10.1:1 is in the range that usually runs on pump premium.
3 factory variants share these dimensions, rated at 140 hp across 1991–1993.
| Displacement | 129 ci |
|---|---|
| Bore | 3.6614" |
| Stroke | 3.0709" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10.1:1 |
| Bore/stroke ratio | 1.192 |
| Fuel type | gas |
|---|---|
| Advertised HP | 140 hp |
| Years | 1991–1993 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1992 | B212 net | 140 @ 6000 | 133 lb-ft @ 2900 | 10.1:1 |
Factory specification sheet.
| Bore/stroke character | 1.192 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,071 ft/min — conservative for a street engine |
| Displacement per cylinder | 32.3 ci |
| Static compression | 10.1:1 — 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 |
|---|---|---|
| 1991 | — | B212 |
| 1992 | 140 hp | B212 |
| 1993 | — | B212 |
1 factory vehicle, 1991–1993. Each year opens that model's engine table.