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Porsche M96/76 specs: 3.6L (219.7 ci) 6-cylinder, 100 x 76.4 mm (3.9370 x 3.0079 in) bore and stroke, 11.7:1 compression. Rated 360 hp. DOHC.
The Porsche M96/76 is oversquare — the 3.937" bore exceeds the 3.0079" stroke by 30.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.0079" stroke does not reach 4,000 ft/min of mean piston speed until about 8,000 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 36.6 ci (600 cc).
11.7:1 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.
Factory fitments include the 911 GT3 (996), 911 GT3 (996.1), 911 GT3 (996.2) and 1 other.
| Displacement | 219.7 ci / 3.6 L |
|---|---|
| Bore | 3.937" |
| Stroke | 3.0079" |
| Cylinders | 6 |
| Compression ratio | 11.7:1 |
| Bore/stroke ratio | 1.309 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 360 hp |
| Bore/stroke character | 1.309 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,008 ft/min — conservative for a street engine |
| Displacement per cylinder | 36.6 ci |
| Static compression | 11.7:1 — high enough that pump premium or better is normally required |
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