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Audi 3B, AAN, ABY, ADU specs: 2.2L (134.3 ci) 5-cylinder, 81 x 86.4 mm (3.1890 x 3.4016 in) bore and stroke, 9:1 compression. Rated 220 hp. DOHC.
The Audi 3B, AAN, ABY, ADU 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 5 cylinders displaces 26.9 ci (440 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
Factory fitments include the Audi S2 (B3), Audi S4 (C4), Audi RS2 Avant.
| Displacement | 134.3 ci / 2.2 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.4016" |
| Cylinders | 5 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 0.938 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 220 hp |
| 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 | 26.9 ci |
| Static compression | 9:1 — low by modern standards, generally happy on regular pump fuel |
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