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Volvo B5254T specs: 149 ci 5-cylinder, 83 x 90 mm (3.2677 x 3.5433 in) bore and stroke, 9:1 compression. Built 1997. Used in the Volvo 850 and Volvo V70.
The Volvo B5254T is undersquare — the 3.5433" stroke exceeds the 3.2677" bore by 7.8% — 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 29.8 ci (488 cc).
9:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 5 engines in the Volvo 149ci family, all of them 149 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 149 ci |
|---|---|
| Bore | 3.2677" |
| Stroke | 3.5433" |
| Cylinders | 5 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 0.922 |
| Fuel type | gas |
|---|---|
| Years | 1997 |
| Bore/stroke character | 0.922 — 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 | 29.8 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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2 factory vehicles, 1997–2000. Each year opens that model's engine table.