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Mitsubishi 6G72 specs: 3.0L (181 ci) 6-cylinder, 91.1 x 76 mm (3.5866 x 2.9921 in) bore and stroke, 10:1 compression. Rated 222 hp. DOHC.
The Mitsubishi 6G72 is oversquare — the 3.5866" bore exceeds the 2.9921" stroke by 19.9% — a layout that favors airflow and RPM over leverage at the crank. The 2.9921" 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 30.2 ci (494 cc).
10:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 6 engines in the Cyclone family, the smallest at 181 ci. Factory fitments include the 3000GT SL, GTO, Diamante.
| Displacement | 181 ci / 3 L |
|---|---|
| Bore | 3.5866" |
| Stroke | 2.9921" |
| Cylinders | 6 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1.199 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 222 hp |
| Bore/stroke character | 1.199 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 2,992 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.2 ci |
| Static compression | 10:1 — in the range that usually runs on pump premium |
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