Mitsubishi 4B11 engine

Technical Specifications

Service regulations for 4B11 2.0 l engine

Oil Service

Gas distributor

Valve thermal clearances

Consumables Replacement

Troubleshooting and repair of the 4B11 2.0L engine

In 2007, Mitsubishi released a new generation of 2-liter engines with the designation 4B11. They are the successors of the well-known 4G63. The Japanese corporation did not independently create a new power unit, they were helped by Hyundai-KIA, Chrysler, Jeep and Dodge. All these companies united to work together on one common engine, which later each of them assembled for themselves at their factories and made some changes. The 4B11 engines were called G4KD by the Koreans, and World by the American companies.

Let’s take a look at the features and differences between the popular G4KD and 4B11

The motor is based on an aluminum cylinder block inside which is a normal crankshaft with all 8 counterweights (on G4KD there are 4) with a piston stroke of 86 mm, 86 mm pistons are used, but they are different, with their own coating and without displacer, which reduces the compression ratio from 10.5 to 10. Piston height is 27.5mm and connecting rods are 149mm long. It also uses its own main and connecting rod liners.

The head is aluminum 16-valve with two camshafts and with a system of changing the timing on both shafts. For 2011, MIVEC was left only on the intake shaft, so don’t be surprised to find only one phase shifter.

This head is almost the same as on G4KD, but different channels of the cylinder head, there are similar camshafts, but they are not hollow, and there are still no hydrocompensators, because of what once in 90 thousand kilometers it is desirable to adjust valve clearances. Valve clearances for cold engine: intake – 0.17-0.23 mm, exhaust – 0.27-0.33 mm.

There is a good chain in the timing drive, it serves well and does not cause any problems.

Let’s continue the comparison, the 4B11 uses its own intake: single-stage intake manifold and intake pipes are organized in their own way. The 4B11 has a different steel thermostat, other ignition coils and a lot of small and tiny changes that make it difficult to use cheap G4KD parts, but with some modifications, they can fit.
Among other things, the quality of metal in the Japanese is more kind and in general leaves the feeling of a better quality product.

In addition to the 2-liter version, the 4B1 family includes 1.8-liter 4B10 and 4B12 for 2.4 liters of volume.

In addition, a 4B11-based turbo version, the 4B11T, was created for the sporty Mitsubishi Lancer Evolution X and Mitsubishi Lancer Ralliart.
Since 2017, the motor has been leisurely replaced by the turbocharged 1.5-liter 4B40.

Disadvantages and problems of 4B11 engines

You are fabulously lucky, unlike the G4KD, the 4B11 motor has no scuffing issues and is made more reliably.

1. Whistling. Look at the A/C compressor bearing, it’s often the one.
2. Crackling. This is how the injectors work, nothing unusual.
3. Vibrations. Usually occur at 1000-1200 rpm and to eliminate them it is often enough to change the plugs.

Otherwise the motor is decent, serves well and with adequate maintenance its resource is 250-300 thousand kilometers and more. The main thing is to change oil in time, not less than once in 10 thousand kilometers. The catalyzer here is not the worst and it serves +/- 150 thousand km. km.

Engine number 4B11

Unlike G4KD, here the number is stamped in front of the engine, near the oil filter.

Mitsubishi 4B11 engine tuning

Chip tuning

These installations are technically different from the Korean G4KD and it will not be possible to rock them by flashing up to 165 hp, at best 5 hp will be added. It will be much more effective to install intake from 4V12, exhaust straight-through on 63 pipe and spider 4-2-1. You can stop here, and you can increase the compression ratio to 11.5 due to pistons from 4B10, and also replace your camshafts on a little more evil, for example from Evo X, it is inefficient, but for the beginning will go.

If the goal is to seriously increase power, then you need to look for Evo X shafts phase 272 or 266 + Evo springs + injectors from 4B12. Give the head to sawing under the valves +1mm. So you can achieve figures close to 200 hp.

Another option to add power is to install stroker kit from 4B12: crankshaft 97 mm and short connecting rods 143.75 mm. The height of blocks is the same, everything will stand normally, and the working volume will increase to 2.25 liters. On standard pistons, the compression ratio will increase to 11.1, and on 4B10, will fly to the sky. The gasket from 4B11T will help to reduce it a bit.

To build a turbo on the basis of usual 4B11, using components from Evo X is a very doubtful idea, the block is reinforced, there are oil injectors, other pistons with connecting rods and a lot of other things, it is easier to immediately replace the car on all-wheel drive Evo 10. But if you want, then you need to remove all the attachments from the 4B11T, put on your motor along with a thick gasket of the cylinder-head, and drive at low pressure, so that it does not fall apart.

ENGINE RATING: 4