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Dodge 315ci specs: 315 ci (5.2L) 8-cylinder, 3.625 x 3.80 in (92.1 x 96.5 mm) bore and stroke, 8:1 compression. Rated 218-230 hp, 1956.
The Dodge 315ci is close to square: 3.625" bore against 3.8" stroke, within 4.6%, which splits the difference between a high-revving layout and a torque layout. The 3.8" stroke puts mean piston speed at 4,000 ft/min around 6,300 RPM, which is where a production bottom end is generally considered at its limit. Each of the 8 cylinders displaces 39.4 ci (645 cc).
8:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 2 engines in the Dodge 315ci family, all of them 315 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated from 218 to 230 hp in 1956.
| Displacement | 315 ci / 5.2 L |
|---|---|
| Bore | 3.625" |
| Stroke | 3.8" |
| Cylinders | 8 |
| Configuration | V8 |
| Compression ratio | 8:1 |
| Bore/stroke ratio | 0.954 |
| Valvetrain | OHV |
|---|---|
| Induction | 4-bbl |
| Fuel type | gas |
| Advertised HP | 218–230 hp |
| Years | 1956 |
| Bore/stroke character | 0.954 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,800 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 39.4 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.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1956 | 218 hp | — |
| 1956 | 230 hp | — |