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Plymouth Mitsubishi G54B 2.6 MCA-Jet Silent Shaft specs: 156 ci (2.6L) 4-cylinder, 3.587 x 3.858 in (91.1 x 98 mm) bore and stroke, 8.2:1 compression.
The Plymouth Mitsubishi G54B 2.6 MCA-Jet Silent Shaft 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.
5 factory variants share these dimensions, rated from 92 to 101 hp across 1981–1985.
| Displacement | 156 ci / 2.6 L |
|---|---|
| Bore | 3.5866" |
| Stroke | 3.8583" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 8.2:1 |
| Bore/stroke ratio | 0.93 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | SOHC |
| Fuel type | gas |
| Advertised HP | 92–101 hp |
| Years | 1981–1985 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 1981 | net | 92 @ 4500 | — | 8.2:1 |
Factory specification sheet.
| 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 |
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 |
|---|---|---|
| 1981 | 92 hp | Mitsubishi G54B 2.6 MCA-Jet Silent Shaft |
| 1982 | 92 hp | Mitsubishi G54B 2.6 MCA-Jet Silent Shaft |
| 1983 | 93 hp | Mitsubishi G54B 2.6 MCA-Jet Silent Shaft |
| 1984 | 101 hp | Mitsubishi G54B 2.6 MCA-Jet Silent Shaft |
| 1985 | 101 hp | Mitsubishi G54B 2.6 MCA-Jet Silent Shaft |
1 factory vehicle, 1981–1985. Each year opens that model's engine table.