Audi EA824 · 3.327" × 3.661" · 11:1 engine specs: 256.3 ci (4.2L), 8-cylinder, 3.3268" bore x 3.6614" stroke, 11:1 compression.
| Displacement | 256.3 ci / 4.2 L |
|---|---|
| Bore | 3.3268" |
| Stroke | 3.6614" |
| Cylinders | 8 |
| Compression ratio | 11:1 |
| Bore/stroke ratio | 0.909 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 335–340 hp |
| Bore/stroke character | 0.909 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,661 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 32.0 ci |
| Static compression | 11:1 — 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 |
|---|---|---|
| — | 335 hp | BFM |
| — | 340 hp | BHF, BNS, BFK, BFM, BHF, BNS, BFM, BBK, BHF, BFM, BNS, BFK, BSM, BHF, BNS, BBK, BBK, BHF, BNS, BBK, BHF, BNS, BFK |