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Hudson 202ci (1955–1956) specs: 202 ci 6-cylinder, 3.00 x 4.75 in (76.2 x 120.7 mm) bore and stroke. Rated 120 hp, 1955–1956. Used in the Hudson Hudson.
The Hudson 202ci (1955–1956) is undersquare — the 4.75" stroke exceeds the 3" bore by 36.8% — a layout that trades peak RPM for leverage and torque low in the range. With a 4.75" stroke, mean piston speed reaches 4,000 ft/min at only 5,050 RPM — the practical ceiling for a production bottom end — which is why a stroke this long makes its power low and runs out of safe revs early. Each of the 6 cylinders displaces 33.7 ci (552 cc).
3 factory variants share these dimensions, rated at 120 hp across 1955–1956.
| Displacement | 202 ci |
|---|---|
| Bore | 3" |
| Stroke | 4.75" |
| Cylinders | 6 |
| Configuration | I6 |
| Bore/stroke ratio | 0.632 |
| Fuel type | gas |
|---|---|
| Advertised HP | 120 hp |
| Years | 1955–1956 |
| Bore/stroke character | 0.632 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,750 ft/min — above the 4,500 ft/min mark where most production bottom ends are considered at their limit |
| Displacement per cylinder | 33.7 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 |
|---|---|---|
| 1955 | — | — |
| 1955 | 120 hp | — |
| 1956 | — | — |
1 factory vehicle, 1955–1956. Each year opens that model's engine table.