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Mitsubishi 4G69 specs: 2.4L (145 ci) 4-cylinder, 87 x 100 mm (3.4252 x 3.9370 in) bore and stroke, 9.5:1 compression. Rated 162 hp. SOHC.
The Mitsubishi 4G69 is undersquare — the 3.937" stroke exceeds the 3.4252" bore by 13.0% — a layout that trades peak RPM for leverage and torque low in the range. The 3.937" stroke puts mean piston speed at 4,000 ft/min around 6,100 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 36.3 ci (594 cc).
9.5:1 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 9 engines in the Sirius family, the largest at 145 ci. Factory fitments include the Lancer Ralliart (04-06), Galant, Outlander and 1 other.
| Displacement | 145 ci / 2.4 L |
|---|---|
| Bore | 3.4252" |
| Stroke | 3.937" |
| Cylinders | 4 |
| Compression ratio | 9.5:1 |
| Bore/stroke ratio | 0.87 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 162 hp |
| Bore/stroke character | 0.870 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,937 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 36.3 ci |
| Static compression | 9.5:1 — in the range that usually runs on pump premium |
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