See other engines in this family
Audi EA824 specs: 5.2L (317.3 ci) 10-cylinder, 84.5 x 92.8 mm (3.3268 x 3.6535 in) bore and stroke, 12.7:1 compression. Rated 540-610 hp. DOHC.
The Audi EA824 is undersquare — the 3.6535" stroke exceeds the 3.3268" bore by 8.9% — 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 10 cylinders displaces 31.7 ci (520 cc).
12.7:1 on aluminum heads 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 9 engines in the EA824 family, sitting between the 244.1 ci and 317.4 ci members. 4 factory variants share these dimensions, rated from 540 to 610 hp. Factory fitments include the Audi R8 V10 (Type 4S), Audi R8 V10 Plus (Type 4S), Audi R8 V10 Performance (Type 4S) and 3 others.
| Displacement | 317.3 ci / 5.2 L |
|---|---|
| Bore | 3.3268" |
| Stroke | 3.6535" |
| Cylinders | 10 |
| Compression ratio | 12.7:1 |
| Bore/stroke ratio | 0.911 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 540–610 hp |
| Bore/stroke character | 0.911 — 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 | 31.7 ci |
| Static compression | 12.7:1 — 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 |
|---|---|---|
| — | 540 hp | CWBA, CWBB |
| — | 540 hp | CWBA, CWBB, CWAB, CWBB, CTPA, CTNA, CWBA, CWBB, CTPA, CTPB, CWBA, CWBB, CWBA, CWBB, DKNA, CYSA, CSPA, CYSA, CYSB |
| — | 610 hp | CWBB, DKNA |
| — | 610 hp | DKAA, DKAB, CWBB, DKAA, CWBB, DMTA, DKAA, CWBA, CWBB, CWBB, DKNA, CWBB, DPAA, DESG, DMSA, DKNA, DMTA |