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Audi CAPA specs: 3.0L (181 ci) 6-cylinder, 83 x 91.4 mm (3.2677 x 3.5984 in) bore and stroke, 16.8:1 compression. Rated 240 hp. Rod ratio and piston speed.
The Audi CAPA is undersquare — the 3.5984" stroke exceeds the 3.2677" bore by 9.2% — a layout that trades peak RPM for leverage and torque low in the range. The 3.5984" stroke puts mean piston speed at 4,000 ft/min around 6,650 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 30.2 ci (494 cc).
At 16.8:1 this is a compression-ignition engine: the ratio is the heat source that lights the fuel, not a knock limit to be managed.
It is one of 2 engines in the EA897 family, the smallest at 181 ci. Factory fitments include the A6 C6, Q7 4L, A8 D3.
| Displacement | 181 ci / 3 L |
|---|---|
| Bore | 3.2677" |
| Stroke | 3.5984" |
| Cylinders | 6 |
| Compression ratio | 16.8:1 |
| Bore/stroke ratio | 0.908 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | diesel |
| Advertised HP | 240 hp |
| Bore/stroke character | 0.908 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,598 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 30.2 ci |
| Static compression | 16.8:1 — high enough that pump premium or better is normally required |
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