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Volvo B5234T6 / B5234T8 specs: 142 ci 5-cylinder, 81 x 90 mm (3.1890 x 3.5433 in) bore and stroke, 8.5:1 compression. Rated 247 hp, 1998–1999.
The Volvo B5234T6 / B5234T8 is undersquare — the 3.5433" stroke exceeds the 3.189" bore by 10.0% — a layout that trades peak RPM for leverage and torque low in the range. 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 5 cylinders displaces 28.4 ci (465 cc).
8.5:1 is low by modern standards and generally happy on regular pump fuel.
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 247 hp across 1998–1999.
| Displacement | 142 ci |
|---|---|
| Bore | 3.189" |
| Stroke | 3.5433" |
| Cylinders | 5 |
| Compression ratio | 8.5:1 |
| Bore/stroke ratio | 0.9 |
| Fuel type | gas |
|---|---|
| Advertised HP | 247 hp |
| Years | 1998–1999 |
| Bore/stroke character | 0.900 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 28.4 ci |
| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1998 | — | B5234T6 / B5234T8 |
| 1999 | 247 hp | B5234T6 / B5234T8 |
1 factory vehicle, 1998–1999. Each year opens that model's engine table.