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Mitsubishi 6G75 specs: 3.8L (233 ci) 6-cylinder, 95 x 90 mm (3.7402 x 3.5433 in) bore and stroke, 10.5:1 compression. Rated 263 hp. SOHC.
The Mitsubishi 6G75 is oversquare — the 3.7402" bore exceeds the 3.5433" stroke by 5.6% — a layout that favors airflow and RPM over leverage at the crank. The 3.5433" stroke puts mean piston speed at 4,000 ft/min around 6,750 RPM, which is where a production bottom end is generally considered at its limit. Each of the 6 cylinders displaces 38.8 ci (636 cc).
10.5:1 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 largest at 233 ci. Factory fitments include the Eclipse GT, Pajero, Galant.
| Displacement | 233 ci / 3.8 L |
|---|---|
| Bore | 3.7402" |
| Stroke | 3.5433" |
| Cylinders | 6 |
| Compression ratio | 10.5:1 |
| Bore/stroke ratio | 1.056 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 263 hp |
| Bore/stroke character | 1.056 — oversquare — bore exceeds stroke, which favours higher RPM and larger valves |
|---|---|
| Mean piston speed at 6,000 RPM | 3,543 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 38.8 ci |
| Static compression | 10.5:1 — in the range that usually runs on pump premium |
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