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Volvo D24 specs: 2.4L (145 ci) 6-cylinder, 76.5 x 86.4 mm (3.0118 x 3.4016 in) bore and stroke. Rated 78 hp, 1980–1984. Used in the Volvo 240.
The Volvo 145ci (D24) 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 24.2 ci (396 cc).
5 factory variants share these dimensions, rated at 78 hp across 1980–1984.
| Displacement | 145 ci / 2.4 L |
|---|---|
| Bore | 3.0118" |
| Stroke | 3.4016" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 22–23:1 (published figures vary) |
| Bore/stroke ratio | 0.885 |
| Fuel type | diesel |
|---|---|
| Advertised HP | 78 hp |
| Years | 1980–1984 |
| 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 | 24.2 ci |
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 |
|---|---|---|
| 1980 | 78 hp | D24 |
| 1981 | 78 hp | D24 |
| 1982 | 78 hp | D24 |
| 1983 | — | D24 |
| 1984 | — | D24 |
1 factory vehicle, 1980–1984. Each year opens that model's engine table.