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Audi PP, RN, ABM, ADA specs: 1.6L (97.6 ci) 4-cylinder, 81 x 77.4 mm (3.1890 x 3.0472 in) bore and stroke, 10:1 compression. Rated 75 hp. SOHC.
The Audi PP, RN, ABM, ADA is close to square: 3.189" bore against 3.0472" stroke, within 4.7%, which splits the difference between a high-revving layout and a torque layout. The 3.0472" stroke does not reach 4,000 ft/min of mean piston speed until about 7,900 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.4 ci (400 cc).
10:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
Factory fitments include the Audi 80 (B2), Audi 80 (B3), Audi A3 (8L).
| Displacement | 97.6 ci / 1.6 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.0472" |
| Cylinders | 4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.047 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 75 hp |
| Bore/stroke character | 1.047 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,047 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.4 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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