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Mitsubishi 4B11 specs: 2.0L (122 ci) 4-cylinder, 86 x 86 mm (3.3858 x 3.3858 in) bore and stroke, 10:1 compression. Rated 148-152 hp, 2008–2017.
The Mitsubishi 4B11 is exactly square — 3.3858" bore and 3.3858" stroke are the same — which splits the difference between a high-revving layout and a torque layout. 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 30.5 ci (500 cc).
10:1 on aluminum heads is in the range that usually runs on pump premium; aluminum sheds heat faster than iron, which makes the same number a little more forgiving.
It is one of 4 engines in the Global Engine family, the smallest at 122 ci. 10 factory variants share these dimensions, rated from 148 to 152 hp across 2008–2017.
| Displacement | 122 ci / 2 L |
|---|---|
| Bore | 3.3858" |
| Stroke | 3.3858" |
| Cylinders | 4 |
| Configuration | I4 |
| Compression ratio | 10:1 |
| Bore/stroke ratio | 1 |
| Block material | aluminum |
|---|---|
| Head material | aluminum |
| Valvetrain | DOHC |
| Fuel type | gas |
| Advertised HP | 148–152 hp |
| Years | 2008–2017 |
| Year | Version | HP @ rpm | Torque @ rpm | Comp. |
|---|---|---|---|---|
| 2008 | 4B11 net | 152 @ 6000 | 146 lb-ft @ 4250 | — |
| 2009 | 4B11 net | 152 @ 6000 | 146 lb-ft @ 4250 | — |
| 2010 | 4B11 net | 152 @ 6000 | 146 lb-ft @ 4250 | — |
| 2015 | 4B11 net | 148 @ 6000 | 145 lb-ft @ 4200 | 10:1 |
| 2017 | 4B11 net | 148 @ 6000 | 145 lb-ft @ 4200 | 10:1 |
Factory specification sheet.
| Bore/stroke character | 1.000 — square — bore and stroke are within 5%, a balanced compromise |
|---|---|
| Mean piston speed at 6,000 RPM | 3,386 ft/min — conservative for a street engine |
| Displacement per cylinder | 30.5 ci |
| Static compression | 10:1 — 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 |
|---|---|---|
| 2008 | 152 hp | 4B11 |
| 2009 | 152 hp | 4B11 |
| 2010 | 152 hp | 4B11 |
| 2011 | — | 4B11 |
| 2012 | — | 4B11 |
| 2013 | — | 4B11 |
| 2014 | — | 4B11 |
| 2015 | 148 hp | 4B11 |
| 2016 | — | 4B11 |
| 2017 | 148 hp | 4B11 |
1 factory vehicle, 2008–2017. Each year opens that model's engine table.