Audi 121ci specs: 82.5 x 92.8 mm (3.2480 x 3.6535 in) bore and stroke, shared by all 10 versions. Displacement, compression and factory ratings.
| Displacement | 121 ci |
|---|---|
| Cylinders | 4 |
| Bore | 3.248" |
| Stroke | 3.654" |
| Compression | 9.3–11.7:1 |
| Advertised power | 190–292 hp |
| Years | 2005–2025 |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| BPG / BWT | 121 ci | 3.248" × 3.6535" | 10.5:1 | 200 |
| CAEB / CPMB | 121 ci | 3.248" × 3.6535" | 9.6:1 | 211–220 |
| CYRB | 121 ci | 3.248" × 3.6535" | 11.7:1 | 190 |
| CYMC / DMSA | 121 ci | 3.248" × 3.6535" | 9.6:1 | 252 |
| DLHA | 121 ci | 3.248" × 3.6535" | — | — |
| DLVA | 121 ci | 3.248" × 3.6535" | — | — |
| CCTA / CDMA / CETA | 121 ci | 3.248" × 3.6535" | 9.6:1 | 200–211 |
| CDLA / CDMA | 121 ci | 3.248" × 3.6535" | 9.8:1 | 265 |
| CHHC / DKZA | 121 ci | 3.248" × 3.6535" | 9.6:1 | 220–228 |
| CJXG / DNUE | 121 ci | 3.248" × 3.6535" | 9.3:1 | 292 |
Compression spans 9.3:1 to 11.7:1, 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.