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Volkswagen BHW specs: 2.0L (120 ci) 4-cylinder, 81 x 95.5 mm (3.1890 x 3.7598 in) bore and stroke, 18.5:1 compression. Rated 134 hp, 2004–2005.
The Volkswagen 120ci (BHW) is undersquare — the 3.7598" stroke exceeds the 3.189" bore by 15.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.7598" stroke puts mean piston speed at 4,000 ft/min around 6,400 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.0 ci (492 cc).
18.5:1 is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 5 engines in the Volkswagen 120ci family, all of them 120 ci — the differences between them are in compression, heads and rating, not displacement. 2 factory variants share these dimensions, rated at 134 hp across 2004–2005.
| Displacement | 120 ci / 2 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.7598" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 18.5:1 * |
| Bore/stroke ratio | 0.848 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 134 hp |
| Years | 2004–2005 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2005 | BHW net | 134 | 247 lb-ft | — |
Factory specification sheet.
| Bore/stroke character | 0.848 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,760 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.0 ci |
| Static compression | 18.5:1 — 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 |
|---|---|---|
| 2004 | — | BHW |
| 2005 | 134 hp | BHW |
1 factory vehicle, 2004–2005. Each year opens that model's engine table.