Porsche 9A2 specs: 91 x 76.4 mm (3.5827 x 3.0079 in) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 181.9 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.583" |
| Stroke | 3.008" |
| Compression | 10.0:1 |
| Advertised power | 370–473 hp |
| Years | 2017–2026 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 30 9A2 991 Turbo | 181.9 ci | 3.5827" × 3.0079" | 10:1 | 370 |
| 9A2 | 181.9 ci | 3.5827" × 3.0079" | — | 370–450 |
| 9A2 Evo | 181.9 ci | 3.5827" × 3.0079" | — | 379–473 |
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.