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Audi BPG / BWT specs: 2.0L (121 ci) 4-cylinder, 82.5 x 92.8 mm (3.2480 x 3.6535 in) bore and stroke, 10.5:1 compression. Rated 200 hp, 2005–2009.
The Audi BPG / BWT is undersquare — the 3.6535" stroke exceeds the 3.248" bore by 11.1% — a layout that trades peak RPM for leverage and torque low in the range. The 3.6535" stroke puts mean piston speed at 4,000 ft/min around 6,550 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.3 ci (496 cc).
10.5:1 is in the range that usually runs on pump premium.
It is one of 10 engines in the Audi 121ci family, all of them 121 ci — the differences between them are in compression, heads and rating, not displacement. 5 factory variants share these dimensions, rated at 200 hp across 2005–2009.
| Displacement | 121 ci / 2 L |
|---|---|
| Bore | 3.248" |
| Stroke | 3.6535" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 0.889 |
| Fuel type | gas |
|---|---|
| Advertised HP | 200 hp |
| Years | 2005–2009 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2005 | BPG / BWT net | 200 @ 5100 | 207 lb-ft @ 1800 | 10.5:1 |
| 2006 | BPG / BWT net | 200 @ 5100 | 207 lb-ft @ 1800 | 10.5:1 |
| 2007 | BPG / BWT net | 200 @ 5100 | 207 lb-ft @ 1800 | 10.5:1 |
| 2008 | BPG / BWT net | 200 @ 5100 | 207 lb-ft @ 1800 | 10.5:1 |
| 2009 | BPG / BWT net | 200 @ 5100 | 207 lb-ft @ 1800 | 10.5:1 |
Factory specification sheet.
| Bore/stroke character | 0.889 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,654 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.3 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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 |
|---|---|---|
| 2005 | 200 hp | BPG / BWT |
| 2006 | 200 hp | BPG / BWT |
| 2007 | 200 hp | BPG / BWT |
| 2008 | 200 hp | BPG / BWT |
| 2009 | 200 hp | BPG / BWT |
1 factory vehicle, 2005–2009. Each year opens that model's engine table.