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Mitsubishi 4G63 DOHC specs: 2.0L (122 ci) 4-cylinder, 85 x 88 mm (3.3465 x 3.4646 in) bore and stroke, 9:1 compression. Built 1989–1993.
The Mitsubishi 4G63 DOHC is close to square: 3.3465" bore against 3.4646" stroke, within 3.4%, which splits the difference between a high-revving layout and a torque layout. The 3.4646" stroke puts mean piston speed at 4,000 ft/min around 6,950 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 30.5 ci (500 cc).
9:1 on aluminum heads is low by modern standards and generally happy on regular pump fuel.
It is one of 8 engines in the 4G63 family, all of them 122 ci — the differences between them are in compression, heads and rating, not displacement. 5 factory variants share these dimensions across 1989–1993.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.3465" |
| Stroke | 3.4646" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 9:1 |
| Bore/stroke ratio | 0.966 |
| Block material | cast iron |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Years | 1989–1993 |
| Bore/stroke character | 0.966 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,465 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
| Static compression | 9:1 — 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 |
|---|---|---|
| 1989 | — | 4G63 DOHC |
| 1990 | — | 4G63 DOHC |
| 1991 | — | 4G63 DOHC |
| 1992 | — | 4G63 DOHC |
| 1993 | — | 4G63 DOHC |
1 factory vehicle, 1989–1993. Each year opens that model's engine table.