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Porsche 587/1 specs: 2.0L (120 ci) 4-cylinder, 92 x 74 mm (3.6220 x 2.9134 in) bore and stroke, 9.2:1 compression. Rated 130 hp, 1962–1965.
The Porsche 587/1 is oversquare — the 3.622" bore exceeds the 2.9134" stroke by 24.3% — a layout that favors airflow and RPM over leverage at the crank. The 2.9134" stroke does not reach 4,000 ft/min of mean piston speed until about 8,250 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 30.0 ci (492 cc).
9.2:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 3 engines in the Porsche 120ci family, all of them 120 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated at 130 hp across 1962–1965.
| Displacement | 120 ci / 2 L |
|---|---|
| Bore | 3.622" |
| Stroke | 2.9134" |
| Cylinders | 4 |
| Compression ratio | 9.2:1 * |
| Bore/stroke ratio | 1.243 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 130 hp |
| Years | 1962–1965 |
| Bore/stroke character | 1.243 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,913 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.0 ci |
| Static compression | 9.2:1 — 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 |
|---|---|---|
| 1962 | 130 hp | 587/1 |
| 1963 | 130 hp | 587/1 |
| 1964 | 130 hp | 587/1 |
| 1965 | 130 hp | 587/1 |
1 factory vehicle, 1962–1965. Each year opens that model's engine table.