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Studebaker 170ci (1947–1962) specs: 170 ci 6-cylinder, 3.00 x 4.00 in (76.2 x 101.6 mm) bore and stroke. Rated 80-112 hp, 1947–1962.
The Studebaker 170ci (1947–1962) is undersquare — the 4" stroke exceeds the 3" bore by 25.0% — a layout that trades peak RPM for leverage and torque low in the range. The 4" stroke puts mean piston speed at 4,000 ft/min around 6,000 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 28.3 ci (464 cc).
12 factory variants share these dimensions, rated from 80 to 112 hp across 1947–1962.
| Displacement | 170 ci |
|---|---|
| Bore | 3" |
| Stroke | 4" |
| Cylinders | 6 |
| Configuration | I6 |
| Compression ratio | 6.5–8.5:1 (published figures vary) |
| Bore/stroke ratio | 0.75 |
| Fuel type | gas |
|---|---|
| Advertised HP | 80–112 hp |
| Years | 1947–1962 |
| Bore/stroke character | 0.750 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 4,000 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 28.3 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 |
|---|---|---|
| 1947 | 80 hp | — |
| 1948 | 80 hp | — |
| 1951 | 85 hp | — |
| 1952 | 85 hp | — |
| 1953 | 85 hp | — |
| 1954 | 85 hp | — |
| 1959 | — | — |
| 1959 | 90 hp | — |
| 1960 | — | — |
| 1961 | — | — |
| 1961 | 112 hp | — |
| 1962 | 112 hp | — |
4 factory vehicles, 1947–1962. Each year opens that model's engine table.