Mitsubishi 4B11/4B11T 2.0L Engine
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This article, which has been updated, has all the information you require about the Mitsubishi 4B11/4B11T 2.0L Engine.
Among Mitsubishi’s finest mechanical creations is the 4B11T. When the 4G63 motor was discontinued because of stricter pollution rules, the Lancer Evolution platform was the vehicle to launch the new engine in 2007.
After 15 years with the 4G63 engine, it’s no surprise that many Evo fans were dissatisfied with the 4B11Steep T’s learning curve. Over time, though, the community’s enthusiasm for the engine rose.
Many Evo X owners were pleasantly surprised by the stock performance of their vehicles after trying out the 4B11T engine. In fact, we’re willing to bet that a properly cared-for stock 4B11T can easily surpass a 4G63T in terms of performance.
In light of this information and the durability of this short-block, all-aluminium 4-cylinder motor, it’s easy to see why you might want one under your hood.
This quick guide covers the basics of Mitsubishi’s 4B11T, from specifications and reliability to swap details.
|Layout||Four stroke, Inline-4 (Straight-4)|
|Displacement||2.0 L, 1,998 cc (121.9 cu in)|
|Fuel system||Electronic control MPI|
|Power output||From 150 PS (110 kW; 147 HP) at 6,000 rpm
to 158 PS (116 kW; 156 HP) at 6,000 rpm
|Torque output||199 N·m (20.3 kg·m, 146.7 ft·lb) at 4,250 rpm|
|Dimensions (L x H x W):||–|
|Cylinder block alloy||Aluminium|
|Cylinder bore:||86.0 mm (3.39 in)|
|Piston stroke:||86.0 mm (3.39 in)|
|Number of piston rings (compression / oil):||2/1|
|Number of main bearings:||5|
|Cylinder inner diameter (standard):||86.000 mm (3.3858 in)|
|Piston skirt diameter (standard):||–|
|Piston pin outer diameter:||23.000 mm (0.9055 in)|
|Connecting rod center distance:||143.75 mm (5.6594 in)|
|Connectin rod small end inner diameter:||23.000 mm (0.9055 in)|
|Crankshaft main journal diameter:||52.000 mm (2.0472 in)|
|Crankpin diameter:||48.000 mm (1.8898 in)|
|Cylinder head alloy||Aluminum|
|Cylinder head height:||–|
|Valve Arrangement:||DOHC, chain drive|
|Valves:||16 (4 valves per cylinder)|
|Valve head diameter:||35.00 mm (1.378 in)|
|29.0 mm (1.1417 in)|
|Valve length:||113.180 mm (4.4559 in)|
|105.887 mm (4.1688 in)|
|Valve stem diameter:||5.500 mm (0.2165 in)|
|5.500 mm (0.2165 in)|
|Cam lift:||9.3 mm (0.3661 in)|
|8.2 mm (0.3228 in)|
|Outer camshaft journal diameter:||№1: 30.000 mm (1.1811 in)
№2-5: 24.000 mm (0.9449 in)
|№1: 36.000 mm (1.4173 in)
№2-5: 24.000 mm (0.9449 in)
|Intake valve||0.17-0.23 mm (0.0067-0.0091 in)|
|Exhaust valve||0.27-0.33 mm (0.0106-0.013 in)|
|Recommended engine oil||SAE 5W-30|
|Oil type API||API: SM or higher|
|Engine oil capacity (Refill capacity)||5.6 L (5.92 US. qt, 4.93 Imp. qt.)|
|Spark plug||NGK ILKR8E6|
|Spark plug gap||0.5-0.6 mm (0.0197-0.0236 in)|
Mitsubishi 4B11/4B11T 2.0L Engine Problems
Unfortunately, the 4B11 engine is not the quietest option available. In this area, the distinctive chirping of the nozzles is a common source of driver anxiety (although this is the norm).
But if the 4B11 engine suddenly begins to whistle, that’s cause for alarm. An issue with the bearings in the AC unit is typically the source of such noises.
High engine oil consumption is another typical issue. Cylinder wall wear or damage to the valve stem seals could be to blame.
Finally, cracks in the cylinder head or the block can develop while the 4B11 is in use. Intense heat is the root cause of these problems. Owners of vehicles equipped with this engine should, therefore, routinely replace the coolant.
Mitsubishi 4B11/4B11T 2.0L Engine Reliability
In comparison to its predecessor, the 4G63 engine, the 4B11T exhibits a more linear increase in torque as engine speed increases.
.In addition, the 4B11-revised T’s standard turbocharger is 20 per cent more responsive at low and medium speeds than the 4G63’s was.
It is possible to get 500 hp to 600 hp out of a stock 4B11T block by upgrading the turbo.
An iron block means a factory 4G63 engine can take more power, but unless you’re racing, why would you need more than 600 who?
Also, the crank walk problem that was common in 4G63 engines was fixed after the design team at Mitsubishi went back to the drawing board.
Isn’t there anything wrong? While the engine is warming up, it makes a knocking sound reminiscent of a diesel engine.
Remember that stretched timing chains are a common cause of engine noise and vibration in vehicles manufactured before 2009.
Mitsubishi 4B11/4B11T 2.0L Engine Review Video
Mitsubishi 4B11/4B11T 2.0L Engine FAQ
Is the 4B11T a good engine?
One of the best-flowing production cylinder heads we’ve seen is the 4B11T.
The cylinder head’s structure is also more rigid than that of the previous 4G63, which should improve cylinder sealing.
What type of engine is a 4B11T?
The Mitsubishi 4B11T is a 2.0-litre turbocharged inline-four that excels in aftermarket form.
Does the 4B11 have a timing belt or chain?
In 2011, Mitsubishi released an updated version of the 4B11 engine, and we now provide a complete kit to replace the timing chain.
It’s likely that the chain has jumped a tooth or more if the car has a rough idle and the triangle warning light is on.