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Audi AEB specs: 1.8L (109 ci) 4-cylinder, 81 x 86.4 mm (3.1890 x 3.4016 in) bore and stroke, 9.5:1 compression. Rated 150 hp. Rod ratio and piston speed.
The Audi EA113 (AEB) 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 4 cylinders displaces 27.3 ci (447 cc).
9.5:1 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.
It is one of 3 engines in the EA113 family, the smallest at 109 ci. Factory fitments include the A4 B5, A6 C5, A4 (B5) and 3 others.
| Displacement | 109 ci / 1.8 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.4016" |
| Cylinders | 4 |
| Compression ratio | 9.5:1 |
| Bore/stroke ratio | 0.938 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 150 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 | 27.3 ci |
| Static compression | 9.5:1 — in the range that usually runs on pump premium |
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