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Nash 173ci (1949–1952) specs: 173 ci 6-cylinder, 3.125 x 3.75 in (79.4 x 95.3 mm) bore and stroke. Rated 82 hp, 1949–1952. Used in the Nash Nash.
The Nash 173ci (1949–1952) is undersquare — the 3.75" stroke exceeds the 3.125" bore by 16.7% — a layout that trades peak RPM for leverage and torque low in the range. The 3.75" stroke puts mean piston speed at 4,000 ft/min around 6,400 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 28.8 ci (472 cc).
4 factory variants share these dimensions, rated at 82 hp across 1949–1952.
| Displacement | 173 ci |
|---|---|
| Bore | 3.125" |
| Stroke | 3.75" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 7–7.25:1 (published figures vary) |
| Bore/stroke ratio | 0.833 |
| Fuel type | gas |
|---|---|
| Advertised HP | 82 hp |
| Years | 1949–1952 |
| Bore/stroke character | 0.833 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,750 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 28.8 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 |
|---|---|---|
| 1949 | 82 hp | — |
| 1950 | 82 hp | — |
| 1951 | 82 hp | — |
| 1952 | 82 hp | — |
1 factory vehicle, 1949–1952. Each year opens that model's engine table.