Audi EA113 specs: 81 x 86.4 mm (3.1890 x 3.4016 in) bore and stroke, shared by all 3 versions. Displacement, compression and factory ratings, plus rod ratio.
| Displacement | 109–109.8 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.189" |
| Stroke | 3.402" |
| Compression | 9.0–9.5:1 |
| Advertised power | 150–225 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 18T 20V Ea113 | 109.8 ci | 3.189" × 3.4016" | 9.5:1 | 150 |
| 18T Ea113 06A | 109 ci | 3.189" × 3.4016" | 9:1 | 225 |
| AEB | 109 ci | 3.189" × 3.4016" | 9.5:1 | 150 |
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.