Audi EA398 specs: 84 x 90.2 mm (3.3071 x 3.5512 in) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 366.1 ci |
|---|---|
| Cylinders | 12 |
| Bore | 3.307" |
| Stroke | 3.551" |
| Compression | 11.0:1 |
| Advertised power | 450 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| BHT, BSB, CEJA, CTNA | 366.1 ci | 3.3071" × 3.5512" | 11:1 | 450 |
This family is represented by a single engine in the database: 366.1 ci, 12 cylinders, a 3.3071" × 3.5512" 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.