Audi EA824 12.5:1 Specs
Audi EA824 · 3.327" × 3.661" · 12.5:1 engine specs: 256.3 ci (4.2L), 8-cylinder, 3.3268" bore x 3.6614" stroke, 12.5:1 compression.
Dimensions
| Displacement | 256.3 ci / 4.2 L |
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| Bore | 3.3268" |
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| Stroke | 3.6614" |
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| Cylinders | 8 |
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| Compression ratio | 12.5:1 |
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| Bore/stroke ratio | 0.909 |
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Construction
| Block material | aluminum |
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| Head material | aluminum |
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| Valvetrain | DOHC |
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| Fuel type | gas |
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| Advertised HP | 420–450 hp |
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What these numbers mean
| Bore/stroke character | 0.909 — undersquare — stroke exceeds bore, which favours low-end torque |
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| Mean piston speed at 6,000 RPM | 3,661 ft/min — in the range typical of performance street engines |
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| Displacement per cylinder | 32.0 ci |
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| Static compression | 12.5:1 — high enough that pump premium or better is normally required |
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Variants sharing these dimensions (3)
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
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| — | 420 hp | BNS |
| — | 420 hp | BXA |
| — | 450 hp | CFSA |
Vehicles (3)
- Audi RS4 (B7)
- Audi R8 (Type 42)
- Audi RS5 (B8)
Similar engines
← All EA824 engines