Audi FSI specs: 84.5 x 92.8 mm (3.3268 x 3.6535 in) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 256.3 ci |
|---|---|
| Cylinders | 8 |
| Bore | 3.327" |
| Stroke | 3.654" |
| Compression | 12.5:1 |
| Advertised power | 420 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 42 V8 FSI R8 RS4 RS5 | 256.3 ci | 3.3268" × 3.6535" | 12.5:1 | 420 |
This family is represented by a single engine in the database: 256.3 ci, 8 cylinders, a 3.3268" × 3.6535" bore and stroke.
All are undersquare — stroke larger than bore, favouring torque low in the range.
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.