See other engines in this family
Mitsubishi G54B specs: 2.6L (159 ci) 4-cylinder, 91.1 x 98 mm (3.5866 x 3.8583 in) bore and stroke, 7:1 compression. Rated 145-176 hp, 1983–1990.
The Mitsubishi G54B 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 39.8 ci (651 cc).
7:1 is low by modern standards and generally happy on regular pump fuel.
11 factory variants share these dimensions, rated from 145 to 176 hp across 1983–1990.
| Displacement | 159 ci / 2.6 L |
|---|---|
| Bore | 3.5866" |
| Stroke | 3.8583" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 7:1 * |
| Bore/stroke ratio | 0.93 |
* Compression ratio from a single source; not yet cross-verified.
| Fuel type | gas |
|---|---|
| Advertised HP | 145–176 hp |
| Years | 1983–1990 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1986 | G54B net | 176 @ 5000 * | 223 lb-ft @ 2500 * | 7:1 * |
| 1987 | G54B net | 176 @ 5000 * | 223 lb-ft @ 2500 * | 7:1 * |
Factory specification sheet. * Not yet cross-verified.
| 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 | 39.8 ci |
| Static compression | 7:1 — low by modern standards, generally happy on regular pump fuel |
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 |
|---|---|---|
| 1983 | — | G54B |
| 1983 | 145 hp | G54B |
| 1984 | — | G54B |
| 1985 | — | G54B |
| 1986 | — | G54B |
| 1986 | 176 hp | G54B |
| 1987 | — | G54B |
| 1987 | 176 hp | G54B |
| 1988 | — | G54B |
| 1989 | — | G54B |
| 1990 | — | G54B |
2 factory vehicles, 1983–1990. Each year opens that model's engine table.