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Audi BHT specs: 6.0L (366 ci) 12-cylinder, 84 x 90.2 mm (3.3071 x 3.5512 in) bore and stroke, 10.7:1 compression. Rated 450 hp. Rod ratio and piston speed.
The Audi W12 (BHT) is undersquare — the 3.5512" stroke exceeds the 3.3071" bore by 6.9% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5512" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 12 cylinders displaces 30.5 ci (500 cc).
10.7:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
Factory fitments include the A8L D3.
| Displacement | 366 ci / 6 L |
|---|---|
| Bore | 3.3071" |
| Stroke | 3.5512" |
| Cylinders | 12 |
| Compression ratio | 10.7:1 |
| Bore/stroke ratio | 0.931 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 450 hp |
| Bore/stroke character | 0.931 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,551 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.5 ci |
| Static compression | 10.7:1 — in the range that usually runs on pump premium |
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