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Porsche 3.2 Carrera specs: 3.2L (193.08 ci) 6-cylinder, 95 x 74.4 mm (3.7402 x 2.9291 in) bore and stroke. SOHC. Rod ratio and piston speed worked out.
The Porsche 3.2 Carrera is oversquare — the 3.7402" bore exceeds the 2.9291" stroke by 27.7% — a layout that favors airflow and RPM over leverage at the crank. The 2.9291" stroke does not reach 4,000 ft/min of mean piston speed until about 8,200 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 32.2 ci (527 cc).
It is one of 15 engines in the 930 family, sitting between the 182.6 ci and 201.32 ci members.
| Displacement | 193.08 ci / 3.2 L |
|---|---|
| Bore | 3.7402" |
| Stroke | 2.9291" |
| Cylinders | 6 |
| Compression ratio | 9.5–10.3:1 (published figures vary) |
| Bore/stroke ratio | 1.277 |
| Valvetrain | SOHC |
|---|---|
| Fuel type | gas |
| Bore/stroke character | 1.277 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,929 ft/min — conservative for a street engine |
| Displacement per cylinder | 32.2 ci |
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