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Porsche 930/61, 930/63 specs: 3.3L (201.32 ci) 6-cylinder, 97 x 74.4 mm (3.8189 x 2.9291 in) bore and stroke, 7:1 compression. Rated 265 hp, 1978.
The Porsche 930/61, 930/63 is oversquare — the 3.8189" bore exceeds the 2.9291" stroke by 30.4% — 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 33.6 ci (550 cc).
7:1 is low by modern standards and generally happy on regular pump fuel.
It is one of 15 engines in the 930 family, the largest at 201.32 ci.
| Displacement | 201.32 ci / 3.3 L |
|---|---|
| Bore | 3.8189" |
| Stroke | 2.9291" |
| Cylinders | 6 |
| Compression ratio | 7:1 |
| Bore/stroke ratio | 1.304 |
| Valvetrain | SOHC |
|---|---|
| Fuel type | gas |
| Advertised HP | 265 hp |
| Years | 1978 |
| Bore/stroke character | 1.304 — 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 | 33.6 ci |
| Static compression | 7:1 — low by modern standards, generally happy on regular pump fuel |
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1 factory vehicle, 1978. Each year opens that model's engine table.