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Audi CALA specs: 3.2L (195.1 ci) 6-cylinder, 85.5 x 92.8 mm (3.3661 x 3.6535 in) bore and stroke, 12.5:1 compression. DOHC. Rod ratio and piston speed.
The Audi CALA is undersquare — the 3.6535" stroke exceeds the 3.3661" bore by 7.9% — a layout that trades peak RPM for leverage and torque low in the range. The 3.6535" stroke puts mean piston speed at 4,000 ft/min around 6,550 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 32.5 ci (533 cc).
12.5:1 on aluminum heads is high for a production gasoline engine; running a ratio like that on pump fuel depends on chamber design and fuel delivery rather than the number alone.
It is one of 5 engines in the EA837 family, the largest at 195.1 ci. Factory fitments include the Audi A4 (B7), Audi A6 (C6), Audi A5 (8T).
| Displacement | 195.1 ci / 3.2 L |
|---|---|
| Bore | 3.3661" |
| Stroke | 3.6535" |
| Cylinders | 6 |
| Compression ratio | 12.5:1 |
| Bore/stroke ratio | 0.921 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Bore/stroke character | 0.921 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,654 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 32.5 ci |
| Static compression | 12.5:1 — high enough that pump premium or better is normally required |
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