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Volvo B234F specs: 142 ci 4-cylinder, 96 x 80 mm (3.7795 x 3.1496 in) bore and stroke, 10:1 compression. Rated 153 hp, 1990–1991. Used in the Volvo 740 / 940.
The Volvo B234F is oversquare — the 3.7795" bore exceeds the 3.1496" stroke by 20.0% — a layout that favors airflow and RPM over leverage at the crank. The 3.1496" stroke does not reach 4,000 ft/min of mean piston speed until about 7,600 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 35.5 ci (582 cc).
10:1 is in the range that usually runs on pump premium.
It is one of 7 engines in the Volvo 142ci family, all of them 142 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated at 153 hp across 1990–1991.
| Displacement | 142 ci |
|---|---|
| Bore | 3.7795" |
| Stroke | 3.1496" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10:1 * |
| Bore/stroke ratio | 1.2 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 153 hp |
| Years | 1990–1991 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1990 | B234F net | 153 @ 5700 * | 150 lb-ft @ 4450 * | 10:1 * |
Factory specification sheet. * Not yet cross-verified.
| Bore/stroke character | 1.200 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,150 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.5 ci |
| Static compression | 10:1 — 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 |
|---|---|---|
| 1990 | 153 hp | B234F |
| 1991 | — | B234F |
1 factory vehicle, 1990–1991. Each year opens that model's engine table.