See other engines in this family
Audi AFC / ATQ specs: 2.8L (169 ci) 6-cylinder, 82.5 x 86.4 mm (3.2480 x 3.4016 in) bore and stroke. Built 1997–2001. Used in the Audi A4 / S4.
The Audi AFC / ATQ is close to square: 3.248" bore against 3.4016" stroke, within 4.5%, which splits the difference between a high-revving layout and a torque layout. 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 28.2 ci (462 cc).
It is one of 2 engines in the Audi 169ci family, all of them 169 ci — the differences between them are in compression, heads and rating, not displacement. 5 factory variants share these dimensions across 1997–2001.
| Displacement | 169 ci / 2.8 L |
|---|---|
| Bore | 3.248" |
| Stroke | 3.4016" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10.1–10.3:1 (published figures vary) |
| Bore/stroke ratio | 0.955 |
| Fuel type | gas |
|---|---|
| Years | 1997–2001 |
| Bore/stroke character | 0.955 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,402 ft/min — conservative for a street engine |
| Displacement per cylinder | 28.2 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 |
|---|---|---|
| 1997 | — | AFC / ATQ |
| 1998 | — | AFC / ATQ |
| 1999 | — | AFC / ATQ |
| 2000 | — | AFC / ATQ |
| 2001 | — | AFC / ATQ |
2 factory vehicles, 1997–2005. Each year opens that model's engine table.