Bore, stroke, displacement and compression for all 5 Audi EA837 engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 163–195.1 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.189–3.366" |
| Stroke | 3.402–3.654" |
| Compression | 9.3–12.5:1 |
| Advertised power | 250–333 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| CALA | 195.1 ci | 3.3661" × 3.6535" | 12.5:1 | — |
| 30T Supercharged | 183 ci | 3.3268" × 3.5039" | 10.3:1 | 333 |
| 30T Supercharged V6 | 182.9 ci | 3.3268" × 3.5039" | 10.3:1 | 272 |
| 27T Biturbo V6 | 164.7 ci | 3.189" × 3.4016" | 9.3:1 | 250 |
| 27T Biturbo | 163 ci | 3.189" × 3.4016" | 9.3:1 | 250 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
Compression spans 9.3:1 to 12.5:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.
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.