Audi TDI specs: 79.5 x 95.5 mm (3.1299 x 3.7598 in) bore and stroke. Displacement, compression and factory ratings for each, plus rod ratio and piston speed.
| Displacement | 115.9 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.130" |
| Stroke | 3.760" |
| Compression | 19.0:1 |
| Advertised power | 90 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 19 TDI I4 | 115.9 ci | 3.1299" × 3.7598" | 19:1 | 90 |
This family is represented by a single engine in the database: 115.9 ci, 4 cylinders, a 3.1299" × 3.7598" 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.