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Audi CEPA, CZGB, DAZA specs: 2.5L (152.6 ci) 5-cylinder, 82.5 x 92.8 mm (3.2480 x 3.6535 in) bore and stroke, 10:1 compression. Rated 340 hp. DOHC.
The Audi CEPA, CZGB, DAZA is undersquare — the 3.6535" stroke exceeds the 3.248" bore by 11.1% — 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 5 cylinders displaces 30.5 ci (500 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.
2 factory variants share these dimensions, rated at 340 hp. Factory fitments include the Audi TT RS (8J), Audi RS3 (8P), Audi RS Q3 (8U) and 8 others.
| Displacement | 152.6 ci / 2.5 L |
|---|---|
| Bore | 3.248" |
| Stroke | 3.6535" |
| Cylinders | 5 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 0.889 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 340 hp |
| Bore/stroke character | 0.889 — 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 | 30.5 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| — | 340 hp | CEPA, CZGB, DAZA |
| — | 340 hp | CEPA, CZGB, DAZA, DNWA, CEPA, DAZA, CEPA, CZGB, DAZA, CEPA, CEPB, CZGB, DAZA, DNWA, CEPA, CESA, CEVA, CTZA, CZGB, DAZA, DNWA, CEPA, CTSA, CZGB, DAZA, DNWA, CEPA, CEPA, CEPA, CZGB |