Bore, stroke, displacement and compression for all 2 Audi EA188 engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 115.9–121.9 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.130–3.189" |
| Stroke | 3.760" |
| Compression | 18.0–19.0:1 |
| Advertised power | 100–140 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| 20 TDI I4 PD | 121.9 ci | 3.189" × 3.7598" | 18:1 | 140 |
| 19 TDI I4 PD | 115.9 ci | 3.1299" × 3.7598" | 19:1 | 100 |
Stroke is constant at 3.7598" across the family — the displacement spread comes from bore, so these share a crank and differ in the block.
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.