See other engines in this family
Audi 27T Biturbo specs: 2.7L (163 ci) 6-cylinder, 81 x 86.4 mm (3.1890 x 3.4016 in) bore and stroke, 9.3:1 compression. Rated 250 hp. DOHC.
The Audi 27T Biturbo 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 6 cylinders displaces 27.2 ci (445 cc).
9.3:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 5 engines in the EA837 family, the smallest at 163 ci. Factory fitments include the S4 B5, A6 C5 Allroad, S4 (B5) and 8 others.
| Displacement | 163 ci / 2.7 L |
|---|---|
| Bore | 3.189" |
| Stroke | 3.4016" |
| Cylinders | 6 |
| Compression ratio | 9.3:1 |
| Bore/stroke ratio | 0.938 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 250 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 | 27.2 ci |
| Static compression | 9.3:1 — low by modern standards, generally happy on regular pump fuel |
Each link opens the calculator with this engine's specs already filled in.