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Audi AAH specs: 2.8L (169 ci) 6-cylinder, 82.5 x 86.4 mm (3.2480 x 3.4016 in) bore and stroke, 10.3:1 compression. Built 1996–1997. Used in the Audi A4 / S4.
The Audi 169ci (AAH) 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).
10.3:1 is in the range that usually runs on pump premium.
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. 2 factory variants share these dimensions across 1996–1997.
| Displacement | 169 ci / 2.8 L |
|---|---|
| Bore | 3.248" |
| Stroke | 3.4016" |
| Cylinders | 6 |
| Configuration | V6 |
| Compression ratio | 10.3:1 * |
| Bore/stroke ratio | 0.955 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Years | 1996–1997 |
| 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 |
| Static compression | 10.3:1 — 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 |
|---|---|---|
| 1996 | — | AAH |
| 1997 | — | AAH |
1 factory vehicle, 1996–1997. Each year opens that model's engine table.