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Porsche M64/50 specs: 3.6L (219.7 ci) 6-cylinder, 100 x 76.4 mm (3.9370 x 3.0079 in) bore and stroke. Rated 355 hp, 1994. Used in the Porsche 911. SOHC.
The Porsche M64/50 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).
It is one of 7 engines in the M64 family, all of them 219.7 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 219.7 ci / 3.6 L |
|---|---|
| Bore | 3.937" |
| Stroke | 3.0079" |
| Cylinders | 6 |
| Bore/stroke ratio | 1.309 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 355 hp |
| Years | 1994 |
| 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 |
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