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Volkswagen BUB specs: 3.2L (194.6 ci) 6-cylinder, 84 x 95.9 mm (3.3071 x 3.7756 in) bore and stroke, 11.3:1 compression. Rated 250 hp, 2008.
The Volkswagen VR6 (BUB) is undersquare — the 3.7756" stroke exceeds the 3.3071" bore by 12.4% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7756" stroke puts mean piston speed at 4,000 ft/min around 6,350 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 32.4 ci (531 cc).
11.3:1 on aluminum heads is high enough that pump premium or better is normally required.
It is one of 11 engines in the VR6 family, sitting between the 170.4 ci and 219.6 ci members.
| Displacement | 194.6 ci / 3.2 L |
|---|---|
| Bore | 3.3071" |
| Stroke | 3.7756" |
| Cylinders | 6 |
| Compression ratio | 11.3:1 |
| Bore/stroke ratio | 0.876 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 250 hp |
| Years | 2008 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2008 | BUB net | 250 @ 6300 | 235 lb-ft @ 2500 | 11.3:1 |
Factory specification sheet.
| Bore/stroke character | 0.876 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,776 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 32.4 ci |
| Static compression | 11.3:1 — high enough that pump premium or better is normally required |
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2 factory vehicles, 2008–2009. Each year opens that model's engine table.