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Dodge 4D55 turbodiesel specs: 140 ci (2.3L) 4-cylinder, 3.587 x 3.543 in (91.1 x 90 mm) bore and stroke. Rated 80-86 hp, 1983–1985. Used in the Dodge Ram 50.
The Dodge 4D55 turbodiesel is close to square: 3.5866" bore against 3.5433" stroke, within 1.2%, which splits the difference between a high-revving layout and a torque layout. 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 4 cylinders displaces 35.0 ci (574 cc).
3 factory variants share these dimensions, rated from 80 to 86 hp across 1983–1985.
| Displacement | 140 ci / 2.3 L |
|---|---|
| Bore | 3.5866" |
| Stroke | 3.5433" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 1.012 |
| Fuel type | diesel |
|---|---|
| Advertised HP | 80–86 hp |
| Years | 1983–1985 |
| Bore/stroke character | 1.012 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 35.0 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 |
|---|---|---|
| 1983 | 80 hp | 4D55 turbodiesel |
| 1984 | 86 hp | 4D55 turbodiesel |
| 1985 | 86 hp | 4D55 turbodiesel |
1 factory vehicle, 1983–1985. Each year opens that model's engine table.