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Saab B234i specs: 140 ci 4-cylinder, 90 x 90 mm (3.5433 x 3.5433 in) bore and stroke, 10.5:1 compression. Rated 150 hp, 1994–1997. Used in the Saab 900.
The Saab B234i is exactly square — 3.5433" bore and 3.5433" stroke are the same — which splits the difference between a high-revving layout and a torque layout. The 3.5433" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 35.0 ci (574 cc).
10.5:1 is in the range that usually runs on pump premium.
It is one of 2 engines in the Saab 140ci family, all of them 140 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated at 150 hp across 1994–1997.
| Displacement | 140 ci |
|---|---|
| Bore | 3.5433" |
| Stroke | 3.5433" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10.5:1 * |
| Bore/stroke ratio | 1 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 150 hp |
| Years | 1994–1997 |
| Bore/stroke character | 1.000 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 35.0 ci |
| Static compression | 10.5:1 — 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 |
|---|---|---|
| 1994 | — | B234i |
| 1995 | 150 hp | B234i |
| 1996 | — | B234i |
| 1997 | — | B234i |
1 factory vehicle, 1994–1997. Each year opens that model's engine table.