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Mitsubishi 4G64 SOHC specs: 2.4L (146 ci) 4-cylinder, 86.5 x 100 mm (3.4055 x 3.9370 in) bore and stroke. Rated 140-145 hp, 1994–2003.
The Mitsubishi 4G64 SOHC is undersquare — the 3.937" stroke exceeds the 3.4055" bore by 13.5% — a layout that trades peak RPM for leverage and torque low in the range. The 3.937" stroke puts mean piston speed at 4,000 ft/min around 6,100 RPM, which is where a production bottom end is generally considered at its limit. Each of the 4 cylinders displaces 36.5 ci (598 cc).
It is one of 5 engines in the Mitsubishi 146ci family, all of them 146 ci — the differences between them are in compression, heads and rating, not displacement. 10 factory variants share these dimensions, rated from 140 to 145 hp across 1994–2003.
| Displacement | 146 ci / 2.4 L |
|---|---|
| Bore | 3.4055" |
| Stroke | 3.937" |
| Cylinders | 4 |
| Configuration | I4 |
| Bore/stroke ratio | 0.865 |
| Fuel type | gas |
|---|---|
| Advertised HP | 140–145 hp |
| Years | 1994–2003 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2003 | 4G64 net | 140 @ 5500 | 155 lb-ft @ 4000 | — |
Factory specification sheet.
| Bore/stroke character | 0.865 — undersquare — stroke exceeds bore, which favours low-end torque |
|---|---|
| Mean piston speed at 6,000 RPM | 3,937 ft/min — in the range typical of performance street engines |
| Displacement per cylinder | 36.5 ci |
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 |
|---|---|---|
| 1994 | 141 hp | 4G64 SOHC |
| 1995 | 141 hp | 4G64 SOHC |
| 1996 | 141 hp | 4G64 SOHC |
| 1997 | — | 4G64 SOHC |
| 1998 | — | 4G64 SOHC |
| 1999 | 145 hp | 4G64 SOHC |
| 2000 | 145 hp | 4G64 SOHC |
| 2001 | 145 hp | 4G64 SOHC |
| 2002 | 145 hp | 4G64 SOHC |
| 2003 | 140 hp | 4G64 SOHC |
1 factory vehicle, 1994–2003. Each year opens that model's engine table.