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Mitsubishi 4G54 specs: 2.6L (156 ci) 4-cylinder, 91.1 x 98 mm (3.5866 x 3.8583 in) bore and stroke, 8.2:1 compression. Rated 114 hp. SOHC.
The Mitsubishi 4G54 is undersquare — the 3.8583" stroke exceeds the 3.5866" bore by 7.0% — a layout that trades peak RPM for leverage and torque low in the range. The 3.8583" stroke puts mean piston speed at 4,000 ft/min around 6,200 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 39.0 ci (639 cc).
8.2:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 3 engines in the Astron family, the largest at 156 ci. Factory fitments include the Starion, Pajero, Sigma and 1 other.
| Displacement | 156 ci / 2.6 L |
|---|---|
| Bore | 3.5866" |
| Stroke | 3.8583" |
| Cylinders | 4 |
| Compression ratio | 8.2:1 |
| Bore/stroke ratio | 0.93 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 114 hp |
| Bore/stroke character | 0.930 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,858 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 39.0 ci |
| Static compression | 8.2:1 — low by modern standards, generally happy on regular pump fuel |
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