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Audi APB specs: 2.7L (163 ci) 6-cylinder, 81 x 86.4 mm (3.1890 x 3.4016 in) bore and stroke. Built 2000–2002. Used in the Audi A4 / S4. DOHC.
The Audi EA835 (APB) is undersquare — the 3.4016" stroke exceeds the 3.189" bore by 6.3% — a layout that trades peak RPM for leverage and torque low in the range. The 3.4016" stroke does not reach 4,000 ft/min of mean piston speed until about 7,050 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 27.2 ci (445 cc).
It is one of 4 engines in the EA835 family, the smallest at 163 ci. 3 factory variants share these dimensions across 2000–2002.
| Displacement | 163 ci / 2.7 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.4016" |
| Cylinders | 6 |
| Configuration | V6 |
| Bore/stroke ratio | 0.938 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Years | 2000–2002 |
| Bore/stroke character | 0.938 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,402 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.2 ci |
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 |
|---|---|---|
| 2000 | — | APB |
| 2001 | — | APB |
| 2002 | — | APB |
1 factory vehicle, 2000–2002. Each year opens that model's engine table.