Porsche 901 specs: 80 x 66 mm (3.1496 x 2.5984 in) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 121.5 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.150" |
| Stroke | 2.598" |
| Compression | 9.0:1 |
| Advertised power | 130 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 901/01 | 121.5 ci | 3.1496" × 2.5984" | 9:1 | 130 |
This family is represented by a single engine in the database: 121.5 ci, 6 cylinders, a 3.1496" × 2.5984" bore and stroke.
All are oversquare — bore larger than stroke, which favours revs over low-end torque.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.