Mitsubishi 4B11T Engine Specs, Problems And Reliability

Mitsubishi 4B11T Engine Specs, Problems And Reliability

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By Scott Matthew

The Mitsubishi 4B11T 2.0-liter turbo engine was produced by the Mitsubishi concern from 2007 to 2016. This engine found its home in high-performance models such as the Lancer Ralliart and various Evolution X modifications. Notably, it is the first engine for the Lancer Evolution to feature a cast aluminum cylinder block, a departure from the cast iron block used in its predecessor, the 4G63T engine.

Key Features:

  • Cylinder Block Material: Cast aluminum, reducing the engine weight by 12 kg compared to the previous 4G63T.
  • Timing System: The engine uses a timing chain instead of a belt for increased durability.
  • Design Basis: All units in this family share a design basis, including distributed fuel injection, a 16-valve DOHC cylinder head without hydraulic lifters, and the MIVEC variable valve timing system on two camshafts.
  • Supercharged Engine: The supercharged version features a semi-closed block, oil nozzles, and reinforced fastening of the crankshaft bearing caps.
  • Turbocharger: Equipped with an MHI TD04HL or TD05H turbine, depending on the version.
  • Material Usage: Aluminum is used for the timing chain housing and cylinder head cover.
  • Throttle Control: Features an electronically controlled throttle.
  • Manifold: Isometric short bore aluminum intake manifold, and a stainless steel outlet manifold located at the rear of the engine.

4B1 family engines: 4B10, 4B11 and 4B12.

Models Installed On:

The engine was installed on Mitsubishi Lancer 10 (CY) in 2007 – 2015 and Mitsubishi Lancer Evolution X (CZ) in 2007 – 2016.

Different Versions:

There are nine different modifications of the 4B11T engine, each offering varying degrees of power. Notable versions include those installed on the Mitsubishi Lancer Ralliart and Evolution X:

  1. Mitsubishi Lancer Ralliart – 240 HP, 353 Nm
  2. Evolution X JDM Edition – 280 HP, 422 Nm
  3. Evolution X USA Edition – 295 HP, 407 Nm
  4. Evolution X EU Edition – 295 HP, 366 Nm

Additionally, in the UK, there were five versions, each with different power outputs:

  1. Evo X GB Edition FQ-300 – 300 HP, 409 Nm
  2. Evo X GB Edition FQ-330 – 329 HP, 437 Nm
  3. Evo X GB Edition FQ-360 – 359 HP, 492 Nm
  4. Evo X GB Edition FQ-400 – 409 HP, 525 Nm
  5. Evo X GB Edition FQ-440 – 446 HP, 559 Nm

Note: Regular maintenance and adherence to manufacturer-recommended service intervals are crucial for the longevity and reliable performance of high-performance turbocharged engines.

Engine Specs

AttributeMitsubishi Lancer Evolution X
Production years2007-2016
Displacement, cc1998
Fuel systemDistributed Injection
Power output, hp240 – 446
Torque output, Nm340 – 560
Cylinder blockAluminum R4
Block headAluminum 16v
Cylinder bore, mm86
Piston stroke, mm86
Compression ratio9.0
Hydraulic liftersNo
Timing driveChain
Phase regulatorMIVEC
TurbochargingMHI TD05H-152G6-12T
Recommended engine oil5W-30, 5W-40
Engine oil capacity, liter5.6
Fuel typePetrol
Euro standardsEURO 4/5
Fuel consumption, L/100 kmCity: 13.6
Highway: 8.3
Combined: 10.2
Engine lifespan, km~300,000
Weight, kg134

Mitsubishi 4B11T Engine Problems

The engine you are describing appears to have several notable issues:

  1. Piston Ring Problems: One of the most significant problems is the tendency for piston rings to disintegrate, leading to damage to cylinder walls and even causing issues with the turbocharger. This can result in a range of complications, including damage to spark plugs.
  2. Timing Chain Issues: While the timing chain in the naturally aspirated version is reported to be durable, the turbocharged variant experiences a shorter lifespan, with replacements occurring as early as 50,000 km. Additionally, frequent replacement of expensive phase regulators is noted.
  3. Cooling System Maintenance: Regular cleaning of oil coolers is emphasized due to the engine’s intolerance to overheating. Keeping the plastic rollers of the drive belt up to date is also crucial to prevent belt dislodgement.
  4. Fuel Pump Vulnerability: The fuel pump is identified as a weak point in the engine, indicating a potential need for attention or replacement.
  5. Exhaust Manifold Cracking: The exhaust manifold is reported to be prone to cracking, which may lead to exhaust-related issues.

Addressing these issues through proactive maintenance, timely replacements, and monitoring can contribute to the longevity and reliability of the 4B11T engine. Regular inspection and adherence to recommended service intervals are essential to catch and rectify potential problems before they escalate.

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