Audi 42 V8 FSI Specs
Audi 42 V8 FSI engine specs: 254 ci (4.2L), 8-cylinder, 3.3268" bore x 3.6535" stroke, 12.5:1 compression.
Dimensions
| Displacement | 254 ci / 4.2 L |
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| Bore | 3.3268" |
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| Stroke | 3.6535" |
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| Cylinders | 8 |
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| Compression ratio | 12.5:1 |
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| Bore/stroke ratio | 0.911 |
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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 hp |
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What these numbers mean
| Bore/stroke character | 0.911 — undersquare — stroke exceeds bore, which favours low-end torque |
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| Mean piston speed at 6,000 RPM | 3,654 ft/min — in the range typical of performance street engines |
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| Displacement per cylinder | 31.8 ci |
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| Static compression | 12.5:1 — high enough that pump premium or better is normally required |
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