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Mitsubishi G32B specs: 1.6L (98 ci) 4-cylinder, 76.9 x 86 mm (3.0276 x 3.3858 in) bore and stroke, 9.5:1 compression. Built 1985–1988.
The Mitsubishi G32B 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 24.5 ci (401 cc).
9.5:1 is in the range that usually runs on pump premium.
It is one of 3 engines in the Mitsubishi 98ci family, all of them 98 ci — the differences between them are in compression, heads and rating, not displacement. 4 factory variants share these dimensions across 1985–1988.
| Displacement | 98 ci / 1.6 L |
|---|---|
| Bore | 3.0276" |
| Stroke | 3.3858" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9.5:1 * |
| Bore/stroke ratio | 0.894 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Years | 1985–1988 |
| 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 | 24.5 ci |
| Static compression | 9.5:1 — in the range that usually runs on pump premium |
Each link opens the calculator with this engine's specs already filled in.
These records share identical bore, stroke, displacement and compression. They differ by model year and factory power rating.
| Year | Advertised HP | Code |
|---|---|---|
| 1985 | — | G32B |
| 1986 | — | G32B |
| 1987 | — | G32B |
| 1988 | — | G32B |
1 factory vehicle, 1985–1988. Each year opens that model's engine table.