Porsche M97 specs: 99 x 82.8 mm (3.8976 x 3.2598 in) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 233.3 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.898" |
| Stroke | 3.260" |
| Compression | 11.8:1 |
| Advertised power | 355 hp |
| Years | 2005–2008 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| M97/01 | 233.3 ci | 3.8976" × 3.2598" | 11.8:1 | 355 |
| M97 | 233.3 ci | 3.8976" × 3.2598" | — | 355 |
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.