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, 12.5:1 compression. Rated 525-550 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).
12.5:1 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. 5 factory variants share these dimensions, rated from 525 to 550 hp. Factory fitments include the Audi R8 (Type 42), Audi R8 (Type 4S), Lamborghini Gallardo and 6 others.
| Displacement | 317.3 ci / 5.2 L |
|---|---|
| Bore | 3.3268" |
| Stroke | 3.6535" |
| Cylinders | 10 |
| Compression ratio | 12.5:1 |
| Bore/stroke ratio | 0.911 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 525–550 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 | 12.5:1 — 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 |
|---|---|---|
| — | 525 hp | BUJ, CSPA, CTPA, CTPB, CTYA, CTYB, BUJ, CSPA, CNDA, CTPA, CTNA |
| — | 525 hp | BUJ, CNDA, CSPA |
| — | 525 hp | BUJ, CSPA, CTPB, CTPC, BUJ, CSPA, CNDA, BUJ, CNDA, CSPA, CTPA, CTNA, CTYA, BUJ, CNDA, CSPA, BUJ, CSPA, CTPB, BUJ, CSPA, CNDA, CTPA, CTNA, BUJ, CSPA, CSLB, BUJ, CSPA, CNDA, CTPA, BUJ, CNDA, BUJ, CSPA, CTPB, CTPA, BUJ, CSPA, CTPB, CTPA, DLGA, BUJ, CSPA, CTPB, CTYA, BUJ, CSPA, CTPB, CTYA, CUDN, CWBA, BXA, BXA, CSPA |
| — | 550 hp | CTPA, CSPA |
| — | 550 hp | CTPA, CTPB, CTPA, CTYA |