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Porsche M44/12 specs: 2.7L (165 ci) 4-cylinder, 104 x 78.9 mm (4.0945 x 3.1063 in) bore and stroke, 10.9:1 compression. Rated 165 hp, 1989.
The Porsche M44/12 is oversquare — the 4.0945" bore exceeds the 3.1063" stroke by 31.8% — a layout that favors airflow and RPM over leverage at the crank. The 3.1063" stroke does not reach 4,000 ft/min of mean piston speed until about 7,750 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 41.3 ci (676 cc).
10.9:1 is in the range that usually runs on pump premium.
| Displacement | 165 ci / 2.7 L |
|---|---|
| Bore | 4.0945" |
| Stroke | 3.1063" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10.9:1 |
| Bore/stroke ratio | 1.318 |
| Fuel type | gas |
|---|---|
| Advertised HP | 165 hp |
| Years | 1989 |
| Bore/stroke character | 1.318 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,106 ft/min — conservative for a street engine |
| Displacement per cylinder | 41.3 ci |
| Static compression | 10.9:1 — in the range that usually runs on pump premium |
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1 factory vehicle, 1989. Each year opens that model's engine table.