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Studebaker 283ci (1965) specs: 283 ci 8-cylinder, 3.875 x 3.00 in (98.4 x 76.2 mm) bore and stroke, 9.25:1 compression. Rated 195 hp, 1965.
The Studebaker 283ci (1965) is oversquare — the 3.875" bore exceeds the 3" stroke by 29.2% — a layout that favors airflow and RPM over leverage at the crank. The 3" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 8 cylinders displaces 35.4 ci (580 cc).
9.25:1 is low by modern standards and generally happy on regular pump fuel.
| Displacement | 283 ci |
|---|---|
| Bore | 3.875" |
| Stroke | 3" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 9.25:1 |
| Bore/stroke ratio | 1.292 |
| Fuel type | gas |
|---|---|
| Advertised HP | 195 hp |
| Years | 1965 |
| Bore/stroke character | 1.292 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,000 ft/min — conservative for a street engine |
| Displacement per cylinder | 35.4 ci |
| Static compression | 9.25:1 — low by modern standards, generally happy on regular pump fuel |
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1 factory vehicle, 1965. Each year opens that model's engine table.