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Mitsubishi 4G32 specs: 1.6L (97 ci) 4-cylinder, 76.9 x 86 mm (3.0276 x 3.3858 in) bore and stroke, 8.5:1 compression. Rated 100 hp. SOHC.
The Mitsubishi 4G32 is undersquare — the 3.3858" stroke exceeds the 3.0276" bore by 10.6% — a layout that trades peak RPM for leverage and torque low in the range. The 3.3858" stroke does not reach 4,000 ft/min of mean piston speed until about 7,100 RPM, so piston speed is not what limits this engine's revs — valvetrain and breathing are. Each of the 4 cylinders displaces 24.3 ci (397 cc).
8.5:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
Factory fitments include the Colt, Lancer, Galant.
| Displacement | 97 ci / 1.6 L |
|---|---|
| Bore | 3.0276" |
| Stroke | 3.3858" |
| Cylinders | 4 |
| Compression ratio | 8.5:1 |
| Bore/stroke ratio | 0.894 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 100 hp |
| Bore/stroke character | 0.894 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,386 ft/min — conservative for a street engine |
| Displacement per cylinder | 24.3 ci |
| Static compression | 8.5:1 — low by modern standards, generally happy on regular pump fuel |
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