Mitsubishi 4B11 Engine Specs, Problems And Reliability

4B11 is a 2.0L motor, released in 2007 as an alternative to the legendary 4G63 owing to stricter emission demands. Having naturally aspirated and turbocharged modifications, it was applied to Mitsubishi Lancer and EVO X cars. As a result, 4B11 turns out to be an aluminum motor featuring modern electronics used in the latest 4G6 versions.

Gaining an aluminum cylinder block with both bore and stroke of 86 millimeters, 4B11 is a steady and free-revving motor. Balance shafts were eliminated. 16V aluminum cylinder head with a double overhead camshaft is located atop of cylinder block. Serving as a substitute for a timing belt, the timing chain controls both intake and exhaust camshafts, equipped with Mitsubishi Innovative Valve timing Electronic Control.

A plastic cylinder head covering plus an intake manifold was utilized to decrease the motor’s weight. The motor keeps an electronically operated multi-point fuel injection system along with fresh electronic ignition with iridium spark plugs and separate ignition coils for all cylinders for more eco-friendliness.

4B11 pertains to Global Engine Alliance and is utilized for Chrysler, Mitsubishi, and Hyundai. Though these engines are a joint venture, they keep some specific details and can’t be used as substitutes for one another. Moreover, 4B12, a 2.4L modification, was created as an alternative to 4G64.

4B11 Engine Specs

Engine typeInline 4-cylinder DOHC 16v, MIVEC (intake only on PHEV)
Displacement2.0 L (1,998 cc)
Bore86 mm (3.39 in)
Stroke86 mm (3.39 in)
Compression ratio10.0:110.5:1 (PHEV)
Fuel systemECI multiple
Peak power110–116 kW (150–158 PS; 148–156 bhp) at 6000 rpm87 kW (118 PS; 117 bhp) at 4500 rpm (PHEV)
Peak torque20.3 kg⋅m (199 N⋅m; 147 lbf⋅ft) at 4250 rpm19.4 kg⋅m (190 N⋅m; 140 lbf⋅ft) at 4500 rpm (PHEV)
Firing Order1-3-4-2
Engine oil5W-20, 5W-30
Engine Oil Capacity4.1 (4.4 qt) – 4B11 until 2012;
5.8 (6.1 qt) – 4B11 after 2012;
5.6 (5.9 qt) – 4B11T;

What Cars Have A 4B11 Engine?

  • 2007-2017 Mitsubishi Lancer
  • 2009 Mitsubishi Outlander (Facelift Europe)
  • 2012 Mitsubishi Outlander Sport
  • 2013 Mitsubishi Outlander PHEV
  • 2010 Mitsubishi ASX, Mitsubishi RVR (Canada)
  • 2010-2015 Proton Inspira

Mitsubishi 4B11 Engine Problems And Reliability

4B11 works pretty loud, provoking much roar while warming up and becoming quieter when it’s warm. Many motors, produced before 2009, have a stretched timing chain, leading to loud and unsteady functioning. Meanwhile, piston rings are weaknesses of turbo motors. Under pressure, they break into pieces, jolting within cylinders and destroying cylinders, valves, and spark plugs. Moreover, they may reach a turbocharger. It’s important to examine catalytic converter regularly as dirt from broken converter can get to cylinders and scratch them.

In total, 4B11 is rather enduring. It is able to run for 200,000 miles (320,000 kilometers). The durability of 4B11T is almost similar to 4G63T. As it features high efficiency, its lifespan is shorter than its non-turbo modification.

Is The 4B11 A Good Engine?

The non-turbo engine’s longevity is around 200,000 miles (320,000 km). The 4B11T is a high-performance engine with a long life expectancy; however, it is naïve to expect it to be as reliable as its predecessor, the 4G63T.

4B11T (Turbo) Engine Review

Being designed for Mitsubishi Lancer Evolution X, 4B11T is a 2.0L turbo version, applied as a substitute to 4G63T. It’s a debut EVO motor featuring a die-cast aluminum cylinder block plus cast iron sleeves. Its block keeps the partially closed deck, not a monoblock deck like 4G63. The motor is 220 millimeters high with a cylinder width of 96 millimeters. Akin to its predecessor, block keeps oil jets to cool forged aluminum pistons by Mahle. Rods are 143.75 millimeters long. Simultaneously, block solidity is better due to the 4-bolt main cap and 2-piece oil pan.

4B11T employs a 16V head with 4 valves per cylinder while the timing chain controls camshafts. Similar to 4B11, this one gained MIVEC continuous variable valve timing on both camshafts.

Intake valves are 35 millimeters and exhaust ones are 29 millimeters while the valve stem is 5.5 millimeters for both of them. 4G63 Gen 3 featured a head with 20% more efficient intake airflow than its successor because of small higher-speed ports. However, the 4B11T motor responds faster at low and mid speeds. Aluminum cylinder head covering substituted plastic one.

Having an MHI TD05H-152G6-12T turbocharger with a boost pressure of 22 psi (1.54 bar), air-to-air intercooler, aluminum intake manifold, stainless steel exhaust manifold, 60 millimeters throttle body plus 540 cc/min fuel injectors, this motor burns much fuel.

In 2017, Mitsubishi Motors discontinued the 4B11T along with Mitsubishi Lancer Evolution X.

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