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Porsche 911/93, 911/98 specs: 2.7L (163.9 ci) 6-cylinder, 90 x 70.4 mm (3.5433 x 2.7717 in) bore and stroke. Rated 167 hp, 1974. Used in the Porsche 911.
The Porsche 911/93, 911/98 is oversquare — the 3.5433" bore exceeds the 2.7717" stroke by 27.8% — a layout that favors airflow and RPM over leverage at the crank. The 2.7717" stroke does not reach 4,000 ft/min of mean piston speed until about 8,650 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 6 cylinders displaces 27.3 ci (448 cc).
It is one of 6 engines in the 911 family, all of them 163.9 ci — the differences between them are in compression, heads and rating, not displacement.
| Displacement | 163.9 ci / 2.7 L |
|---|---|
| Bore | 3.5433" |
| Stroke | 2.7717" |
| Cylinders | 6 |
| Bore/stroke ratio | 1.278 |
| Block material | magnesium |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 167 hp |
| Years | 1974 |
| Bore/stroke character | 1.278 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,772 ft/min — conservative for a street engine |
| Displacement per cylinder | 27.3 ci |
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