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Audi CYRB specs: 2.0L (121 ci) 4-cylinder, 82.5 x 92.8 mm (3.2480 x 3.6535 in) bore and stroke, 11.7:1 compression. Rated 190 hp, 2017–2020.
The Audi CYRB is undersquare — the 3.6535" stroke exceeds the 3.248" bore by 11.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.6535" stroke puts mean piston speed at 4,000 ft/min around 6,550 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.3 ci (496 cc).
11.7:1 is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 10 engines in the Audi 121ci family, all of them 121 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions, rated at 190 hp across 2017–2020.
| Displacement | 121 ci / 2 L |
|---|---|
| Bore | 3.248" |
| Stroke | 3.6535" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 11.7:1 * |
| Bore/stroke ratio | 0.889 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 190 hp |
| Years | 2017–2020 |
| Bore/stroke character | 0.889 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,654 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.3 ci |
| Static compression | 11.7:1 — high enough that pump premium or better is normally required |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 2017 | 190 hp | CYRB |
| 2018 | 190 hp | CYRB |
| 2019 | — | CYRB |
| 2020 | — | CYRB |
1 factory vehicle, 2017–2020. Each year opens that model's engine table.