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Nash 250ci (1956) specs: 250 ci 8-cylinder, 3.50 x 3.25 in (88.9 x 82.6 mm) bore and stroke, 8:1 compression. Rated 190 hp, 1956. Used in the Nash Nash.
The Nash 250ci (1956) is oversquare — the 3.5" bore exceeds the 3.25" stroke by 7.7% — a layout that favors airflow and RPM over leverage at the crank. The 3.25" stroke does not reach 4,000 ft/min of mean piston speed until about 7,400 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 31.3 ci (512 cc).
8:1 is low by modern standards and generally happy on regular pump fuel.
| Displacement | 250 ci |
|---|---|
| Bore | 3.5" |
| Stroke | 3.25" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 8:1 * |
| Bore/stroke ratio | 1.077 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 190 hp |
| Years | 1956 |
| Bore/stroke character | 1.077 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,250 ft/min — conservative for a street engine |
| Displacement per cylinder | 31.3 ci |
| Static compression | 8:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.
1 factory vehicle, 1956. Each year opens that model's engine table.