Mitsubishi 4B11

Mitsubishi 4B11The Mitsubishi 4B11 is an inline 2.0 liter (1,998 cc, 121.9 cu in) four-cylinder, four-stroke cycle gasoline engine manufactured by Mitsubishi Motors since 2007.

The Mitsubishi 4B11 engine has an aluminum block and cylinder head, pentroof type combustion chamber, dual overhead camshaft (DOHC), four-valve designs with valve timing electronic control system (MIVEC) on both camshafts, electronic spark-advance control type ignition system, and electronic control multi-point fuel injection system.

An 86.0 mm (3.39 in) cylinder bore and 86.0 mm (3.39 in) piston stroke give the engine a total of 2.0 L of displacement. The compression ratio rating is 10.0:1.

The MMC 4B11 produced from 150 PS (110 kW; 147 HP) at 6,000 rpm to 158 PS (116 kW; 156 HP) at 6,000 rpm of horsepower and 199 N·m (20.3 kg·m, 146.7 ft·lb) at 4,250 rpm of peak torque.

General information

Engine Specifications
Engine code4B11
LayoutFour stroke, Inline-4 (Straight-4)
Fuel typeGasoline
Production2007-
Displacement2.0 L, 1,998 cc (121.9 cu in)
Fuel systemElectronic control MPI
Power adderNone
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
Firing order1-3-4-2
Dimensions (L x H x W):
Weight

Cylinder block

The 4B11 has an aluminum block, cylinder bore is 86.0 mm (3.39 in) and the piston stroke is 86.0 mm (3.39 in), the compression ratio is 10.0:1.

The pistons are each fitted with two compression rings and a single oil ring, connecting rods are 143.75 mm (5.659 in) center-to-center long. The pistons are made of a special aluminum alloy. The connecting rods are made of highly rigid, forged
carbon steel. The crankshaft for the 4B11 engine has 8 balance weights and supported by five main bearings.

Cylinder block
Cylinder block alloyAluminium
Compression ratio:10.0:1
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
Block Height:
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

The engine has an aluminum cylinder head with two chain-driven overhead camshafts and MIVEC (MITSUBISHI INNOVATIVE VALVE TIMING ELECTRONIC CONTROL SYSTEM) for both the intake and exhaust valves. Intake valves are 35.0 mm (1.38 in) in diameter, and the exhaust valves are 29.0 mm (1.14 in).

The Mitsubishi 4B11 engine does not have hydraulic lifters, so special valve tappets are used to adjust the valve clearance. To adjust the valve lift, 47 sizes of valve tappets are available in 0.015 mm (0.0006 in) increments, from 3.000 mm (0.1181 in) to 3.690 mm (0.1453 in).

Cylinder head
Cylinder head alloyAluminum
Cylinder head height:
Valve Arrangement:DOHC, chain drive
Valves:16 (4 valves per cylinder)
Intake/Exhaust duration:
Valve head diameter:INTAKE35.00 mm (1.378 in)
EXHAUST29.0 mm (1.1417 in)
Valve length:INTAKE113.180 mm (4.4559 in)
EXHAUST105.887 mm (4.1688 in)
Valve stem diameter:INTAKE5.500 mm (0.2165 in)
EXHAUST5.500 mm (0.2165 in)
Cam lift:INTAKE9.3 mm (0.3661 in)
EXHAUST8.2 mm (0.3228 in)
Outer camshaft journal diameter:INTAKE №1: 30.000 mm (1.1811 in)
№2-5: 24.000 mm (0.9449 in)
EXHAUST №1: 36.000 mm (1.4173 in)
№2-5: 24.000 mm (0.9449 in)

Maintenance data

Valve clearance
Intake valve0.17-0.23 mm (0.0067-0.0091 in)
Exhaust valve0.27-0.33 mm (0.0106-0.013 in)
Oil system
Recommended engine oilSAE 5W-30
Oil type APIAPI: SM or higher
Engine oil capacity (Refill capacity)5.6 L (5.92 US. qt, 4.93 Imp. qt.)
Ignition system
Spark plugNGK ILKR8E6
Spark plug gap0.5-0.6 mm (0.0197-0.0236 in)

Vehicle applications

ModelYears Produced
Mitsubishi Lancer2007-2017
Peugeot 40072007–2012
Mitsubishi Outlander2009
Mitsubishi Outlander Sport2012
Mitsubishi ASX2010
Mitsubishi RVR (Canada)2010
Proton Inspira2010-2015
Mitsubishi Delica2007-
Mitsubishi Eclipse Cross2018-
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