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Volvo D24T specs: 146 ci 6-cylinder, 76.5 x 86.4 mm (3.0118 x 3.4016 in) bore and stroke, 22:1 compression. Built 1985–1986. Used in the Volvo 740 / 940.
The Volvo D24T is undersquare — the 3.4016" stroke exceeds the 3.0118" bore by 11.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4016" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 24.3 ci (399 cc).
At 22:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
2 factory variants share these dimensions across 1985–1986.
| Displacement | 146 ci |
|---|---|
| Bore | 3.0118" |
| Stroke | 3.4016" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 22:1 * |
| Bore/stroke ratio | 0.885 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | diesel |
|---|---|
| Years | 1985–1986 |
| Bore/stroke character | 0.885 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,402 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.3 ci |
| Static compression | 22:1 — high enough that pump premium or better is normally required |
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 |
|---|---|---|
| 1985 | — | D24T |
| 1986 | — | D24T |
1 factory vehicle, 1985–1986. Each year opens that model's engine table.