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Volkswagen CBT / CBU specs: 2.5L (151 ci) 5-cylinder, 82.5 x 92.8 mm (3.2480 x 3.6535 in) bore and stroke, 9.5:1 compression. Rated 170 hp, 2012–2014.
The Volkswagen CBT / CBU 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 5 cylinders displaces 30.2 ci (495 cc).
9.5:1 is in the range that usually runs on pump premium.
It is one of 3 engines in the Volkswagen 151ci family, all of them 151 ci — the differences between them are in compression, heads and rating, not displacement. 3 factory variants share these dimensions, rated at 170 hp across 2012–2014.
| Displacement | 151 ci / 2.5 L |
|---|---|
| Bore | 3.248" |
| Stroke | 3.6535" |
| Cylinders | 5 |
| Compression ratio | 9.5:1 |
| Bore/stroke ratio | 0.889 |
| Fuel type | gas |
|---|---|
| Advertised HP | 170 hp |
| Years | 2012–2014 |
| 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 | 30.2 ci |
| Static compression | 9.5:1 — 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 |
|---|---|---|
| 2012 | 170 hp | CBT / CBU |
| 2013 | 170 hp | CBT / CBU |
| 2014 | 170 hp | CBT / CBU |
1 factory vehicle, 2012–2014. Each year opens that model's engine table.