Mitsubishi 4B11T Engine

Characteristics of the 4B11T engine

Reliability, problems and repair of the 4B11T engine

Evo 10 engineSpecially for the Mitsubishi Lancer Evolution 10, a new engine was created to replace the legendary 4G63T. The new engine was called 4B11T, it also had 4 cylinders and a working volume of 2 liters, but there was also something new. Here used semi-closed aluminum cylinder block with cast iron liners, its height is 220 mm, and the intercylinder distance is 96 mm, balancer shafts are absent. This block was fitted with oil injectors, 86 mm stroke crankshaft, 86 mm diameter and 33.35 mm high Mahle forged pistons, and 143.75 mm long connecting rods. The result was 2 liters of displacement and a compression ratio of 9. Stock pistons weigh 546.2 grams, standard connecting rods weigh 572.5 grams, and the crankshaft weighs 16.6 kg.

On top of the block is a new 16-valve aluminum head with MIVEC continuous variable valve timing on both camshafts. Inlet valve size is 35mm, exhaust valve size is 29mm, valve stem diameter is 5.5mm.

It is necessary to check and, if required (valves are noisy), adjust the valves every 60 thousand kilometers. Valve clearances (cold engine): intake 0.17-0.23 mm, exhaust 0.27-0.33 mm.
Characteristics of stock Evo 10 camshafts are as follows: phase 252/224, lift 9.7/8.58 mm.
The timing system uses a chain.

On the inlet is installed throttle valve with a diameter of 60 mm. The performance of the stock injectors is 540 cc/min.

As a supercharger here is installed turbine MHI TD05H-152G6-12T with intercooler. The boost pressure is up to 1.54 bar.

The exhaust has a diameter of 57 mm.

In Britain, a version of Evo X FQ-330 was sold, the engine of which was modified by HKS. They replaced the intercooler, intake tract, downpipe, catalytic converter, catback with their HKS ones and put Ecutek software. This allowed them to increase power to 329 hp at 6500 rpm and torque to 437 Nm at 3500 rpm.

This was not enough, and they created a version of Evolution X FQ-360, where they installed a new fuel pump and Ecutek firmware. This brought the power to 359 hp at 6500 rpm and 492 Nm of torque at 3500 rpm.

There was also a more powerful version of the Evo – FQ-400. It was created on the basis of FQ-360 and differed by intercooler, intake tract, modified turbine, 76 mm exhaust and tuning of the control unit. The result was a power output of 408 hp at 6,500 rpm and 542 Nm of torque at 3,500 rpm.

That’s not all, there was an even more powerful modification – the FQ-440. Here the intake from Janspeed was put, the turbine was replaced by HKS, new injectors, exhaust manifold from Janspeed and all exhaust from them.
Such an Evo develops 446 hp at 6800 rpm, its torque 559 Nm at 3500 rpm.

Besides all these evil 4B11 turbos, there were produced simpler variants, especially for Mitsubishi Lancer Ralliart X. In this motor there is a turbine MHI TD04HL-15T, which blows up to 1.25 bar. Also there is a small intercooler, narrow piping, another air filter box, changed the location of the battery and its own exhaust. The motor is the same in terms of iron, only the attachments have been changed.

Since this engine was developed with Hyundai and Chrysler, it is very similar to the Hyundai G4KH and many people think they are the same, but they are not. They have different cylinder blocks (Hyundai’s is open and less strong), completely different heads (for example, Hyundai has direct injection), G4KH pistons are worse, connecting rods are less strong, even the TD04-19T turbo is different. But in general, the motors are related.

In addition, there is also an atmospheric version of the 4B11, which differs not only in the absence of a turbine, but also in the block, the absence of oil injectors, all the innards, head, intake, exhaust.

In early 2017, production of the Lancer Evo X was ended, and with it the 4B11T ceased to be produced.

Problems and shortcomings of Mitsubishi 4B11T engines

1. Swimming revs, not driving. Perhaps you have stretched the timing chain, this is especially prone to cars up to 2009. You need to check and replace the chain with the whole set.
2. Motor noise, tingling. On Evo 10, the problem is in the piston rings, which are destroyed, begin to dangle in the cylinder, bend the spark plug electrode, hit the piston and valves, then flying into the exhaust pipe, breaking the turbine. But this applies to cars with tuning, so you can’t call it a disease.
3. Crack in the exhaust manifold. This also applies to cars on tuning, but these are the majority. Here there is a risk of a crack in the manifold and on the hot part of the turbine.

In addition, check the condition of the oil coolers, which over time get fouled. You also need to monitor the condition of the plastic drive belt rollers, which wear out quickly. Usually they are replaced with adapted from Hyundai or ordinary new ones.

In general, it is not a bad motor with a normal resource, without tuning drives well and with regular and quality service, does not cause problems. The resource can exceed 250 thousand kilometers. There are very few cars with high mileage, perhaps 300 thousand kilometers is not the limit.

Tuning engine 4B11T

Stage 2

Increase power on your Evo X is very easy, just put a cold intake, remove the catalytic converter, replace the connecting rod bolts with ARP or put normal H-beam connecting rods, buy a boost controller and customize the ECU. This will give 370+ hp. You can leave the stock connecting rods in, but breaking them would be a matter of time.

Add a pump like a DW65C, 1000 cc injectors, a block-off, oil washer, 76mm exhaust, and tune. You will get about 400 horses at the flywheel. That’s the optimal combination of speed and reliability, and it’s how most Evolution 10s are driven.

To get more power you’ll need a Garrett GTX3071R with a good tuned manifold, large intercooler, 3.5-inch pipes, with a pump like the AEM 320 lph. You will also need Cosworth MX1 shafts and valve springs, 1300 cc injectors, AEM fuel rail, ARP studs. Once tuned, a motor like this will easily show 400+hp at the wheels.

You could put in a GTX3076R and blow 500+ horses at the wheels. Stock pistons and block will hold this power and even more, but for reliability it is better to go to forging, normally prepare the cylinder head, – to do as it should.

Ralliart Stage 2

It is possible to add power to Lancer Ralliart X motor by changing the filter to K&N, remove the catalytic converter or put a catalytic converterless exhaust on 76 mm pipe and flash the brain. This will give about 300 hp and dynamics at the level of stock Evolution X.

If this is not enough, then you need to remake for this Evo, replacing the intake with the same from Evo X, along with the intercooler, with piping, with oil cooler, with a turbo TD05H and with the manifold. The intake is noticeably different and will need to be completely rebuilt or a tuned cold intake. The exhaust also requires modification or, again, to put immediately without rolling 76 mm diameter.

After the rebuild you can go the way of tuning Evo 4B11T: cold intake, 76mm exhaust, ARP crank bolts, boost controller and firmware. With all that, your Ralliart will drive like most Evics on a chip-exhaust.

ENGINE RATING: 5-