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Porsche 930/51, 930/53 specs: 3.0L (182.6 ci) 6-cylinder, 95 x 70.4 mm (3.7402 x 2.7717 in) bore and stroke. Rated 234 hp, 1976–1977. Used in the Porsche 911.
The Porsche 930/51, 930/53 is oversquare — the 3.7402" bore exceeds the 2.7717" stroke by 34.9% — a layout that favors airflow and RPM over leverage at the crank. The 2.7717" stroke does not reach 4,000 ft/min of mean piston speed until about 8,650 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 30.4 ci (499 cc).
It is one of 6 engines in the 930 family, all of them 182.6 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated at 234 hp across 1976–1977.
| Displacement | 182.6 ci / 3 L |
|---|---|
| Bore | 3.7402" |
| Stroke | 2.7717" |
| Cylinders | 6 |
| Bore/stroke ratio | 1.349 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 234 hp |
| Years | 1976–1977 |
| Bore/stroke character | 1.349 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,772 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.4 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 |
|---|---|---|
| 1976 | 234 hp | 930/51, 930/53 |
| 1977 | 234 hp | 930/51, 930/53 |