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Porsche M96/03 Powerkit specs: 219.4 ci 6-cylinder, 96 x 82.8 mm (3.7795 x 3.2598 in) bore and stroke, 11.3:1 compression. Rated 345 hp, 2004.
The Porsche M96/03 Powerkit is oversquare — the 3.7795" bore exceeds the 3.2598" stroke by 15.9% — a layout that favors airflow and RPM over leverage at the crank. The 3.2598" stroke does not reach 4,000 ft/min of mean piston speed until about 7,350 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 (599 cc).
11.3:1 is high enough that pump premium or better is normally required.
It is one of 11 engines in the M96 family, the largest at 219.4 ci.
| Displacement | 219.4 ci |
|---|---|
| Bore | 3.7795" |
| Stroke | 3.2598" |
| Cylinders | 6 |
| Compression ratio | 11.3:1 * |
| Bore/stroke ratio | 1.159 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Firing order | 1-6-2-4-3-5 |
| Advertised HP | 345 hp |
| Years | 2004 |
| Bore/stroke character | 1.159 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,260 ft/min — conservative for a street engine |
| Displacement per cylinder | 36.6 ci |
| Static compression | 11.3:1 — high enough that pump premium or better is normally required |
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1 factory vehicle, 2002–2008. Each year opens that model's engine table.