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Mitsubishi 4B10 Specifications
| Engine Model: Mitsubishi 4B10 |
| Engine Type: 4-cycle inline 4-cylinder DOHC 16-valve liquid-cooled gasoline |
| Total Displacement: 109.8 cu.in (1.79 L) |
| Rated Engine Power: 134-145 Hp (100-107 kW) at 6000 rpm |
| Fuel System Type: Sequential multi-point electronic fuel injection |
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| General Technical Data |
The Mitsubishi 4B10 engine is a 1.8-liter inline four-cylinder gasoline powerplant that belongs to the 4B1 engine family, jointly developed by Mitsubishi Motors and DaimlerChrysler under the World Engine program. It was introduced in 2006 and widely used in vehicles such as the Mitsubishi Lancer, Galant Fortis, and ASX/RVR.
The 4B10 was designed to offer a balance between fuel efficiency, emissions compliance, and smooth operation. It features an aluminum alloy construction, dual overhead camshafts, four valves per cylinder, and advanced electronic engine management. In its original form, the 4B10 employed a fixed valve timing system with multipoint fuel injection.
Later Euro 5 and Euro 6 compliant versions
incorporated Mitsubishi’s MIVEC (Mitsubishi Innovative Valve timing
Electronic Control) system for continuously variable valve timing,
improving torque delivery, combustion efficiency, and exhaust emissions.
The engine was developed to meet strict international emission standards
while maintaining reliability and serviceability.
The 4B10 replaced older 4G93 and 4G94 engines and represented a major
leap forward in lightweight design, refinement, and power-to-weight
efficiency. The adoption of an all-aluminum block and head reduced
weight significantly, contributing to better vehicle handling and fuel
economy.
The MIVEC-equipped versions further enhanced
performance across a broad rpm range while maintaining low fuel
consumption and reduced CO2 output. The engine’s smoothness,
compactness, and modularity allowed it to be adapted across several
Mitsubishi models and even to sister brands under the global cooperation
program.
The 4B10 engine has a total displacement of 1,798 cc (109.8 cubic
inches), achieved through a bore of 86.0 mm (3.39 inches) and a stroke
of 77.4 mm (3.05 inches). This undersquare configuration favors a
balance of torque and rev capability. The compression ratio varies
between 10.0:1 for early non-MIVEC versions and 10.5:1 for later
MIVEC-equipped models.
The engine operates on the four-stroke Otto
cycle, with firing order 1-3-4-2 and clockwise crankshaft rotation when
viewed from the timing belt side. Idle speed is approximately 700 ± 50
revolutions per minute, with a redline near 6,500 rpm and fuel cut-off
at approximately 6,800 rpm.
The cylinder block is cast from high-strength aluminum alloy featuring
cast-iron cylinder liners for wear resistance. The block design uses a
closed-deck structure and deep skirt configuration, increasing rigidity
and reducing vibration. The crankshaft is forged steel supported by five
main bearings.
Each connecting rod is made of sintered steel with a fracture-split design for accurate cap alignment. The pistons are lightweight aluminum alloy with molybdenum-coated skirts, two compression rings, and one oil control ring. The cylinder head is also aluminum alloy and houses dual overhead camshafts (DOHC) operating four valves per cylinder, totaling sixteen valves.
Valve actuation is via roller rocker arms with
hydraulic lash adjusters, reducing maintenance. In MIVEC versions, the
intake camshaft incorporates an electronically controlled hydraulic
phaser capable of continuously adjusting cam timing up to approximately
35 degrees of crankshaft rotation.
Power output for the standard 4B10 engine ranges from 100 to 105 kW (134
to 141 horsepower, or 132 to 139 bhp) at 6,000 rpm. Peak torque is
around 175 Nm (129 lb-ft) at 4,250 rpm. The later MIVEC-equipped
versions produce slightly higher output - approximately 107 kW (145
horsepower, 143 bhp) at 6,000 rpm and 179 Nm (132 lb-ft) of torque at
4,250 rpm - while maintaining equal or lower fuel consumption. The
engine was engineered to run on unleaded regular gasoline with a minimum
octane rating of 95 RON (91 AKI).
| Fuel System |
The fuel delivery system in the 4B10 engine is a multi-point electronic fuel injection type (MPI). Fuel is supplied by an electric pump located within the fuel tank and routed through a high-pressure line to the fuel rail on the intake manifold. Each cylinder is served by a solenoid-actuated injector that sprays atomized fuel into the intake port near the valve seat.
The ECU (Engine Control Unit) governs injection timing and duration
based on feedback from sensors monitoring throttle position, intake air
temperature, mass air flow, oxygen concentration, and engine speed. Fuel
pressure is regulated to approximately 350 kPa (51 psi) and maintained
by a pressure regulator integrated with the fuel pump module. Excess
fuel returns to the tank through a return line in early systems, while
later returnless systems minimize evaporative losses.
The fuel filter is integrated with the pump assembly and designed for
lifetime service, though periodic inspection is advised after 150,000 km
(93,000 miles). The intake manifold is made of lightweight composite
material, while the throttle body is electronically actuated in later
versions. The combination of precise injector control and MIVEC valve
timing ensures improved combustion stability and lower emissions under
all load conditions.
| Lubrication System |
The 4B10 employs a fully pressurized wet-sump lubrication system. A trochoid-type oil pump, driven directly by the crankshaft, circulates oil through a full-flow filter and internal galleries to lubricate crankshaft journals, camshafts, and valve train components. Piston cooling oil jets spray the underside of the pistons to control temperature and reduce knock tendency.
The oil pressure is approximately 300 to 400 kPa (43 to 58 psi) at 3,000
rpm, and about 100 kPa (15 psi) at idle. Total oil capacity, including
the filter, is 4.0 liters (4.2 US quarts, 3.5 Imperial quarts).
Recommended oil grade is SAE 5W-30 or 0W-20 meeting API SM or higher,
depending on climate and fuel quality. The PCV (Positive Crankcase
Ventilation) valve maintains crankcase pressure balance and recirculates
blow-by gases to the intake for cleaner emissions.
Oil and filter changes are recommended every 10,000 km (6,000 miles) or
six months under normal driving conditions, with more frequent service
under severe use. Regular maintenance ensures consistent oil pressure,
reduced wear, and proper function of hydraulic lash adjusters and MIVEC
actuators.
| Cooling System |
A liquid cooling system maintains optimal engine temperature. The system includes an aluminum radiator, a belt-driven centrifugal water pump, thermostat, and electric cooling fan controlled by the ECU. The thermostat starts to open at approximately 82°C (180°F) and is fully open at about 95°C (203°F). The system is pressurized to 108 kPa (15.6 psi) by the radiator cap to prevent boiling and cavitation.
Coolant capacity is approximately 6.3 liters (6.7 US quarts, 5.5 Imperial quarts). The recommended coolant mixture is 50% long-life ethylene glycol antifreeze and 50% deionized water, protecting against freezing to –35°C (–31°F) and corrosion. The coolant should be replaced every 160,000 km (100,000 miles) or five years, whichever comes first.
| Intake and Exhaust Systems |
The intake manifold uses tuned long runners to enhance low- and mid-range torque. The air cleaner assembly employs a replaceable dry paper element, recommended for renewal every 20,000 km (12,000 miles). The throttle body, depending on the model, may be cable-actuated or electronic (ETACS-integrated).
The exhaust manifold is made of stainless steel, with a close-coupled catalytic converter located immediately downstream to ensure rapid light-off. Oxygen sensors positioned before and after the catalyst provide feedback for air-fuel ratio control. Euro 5/6 versions incorporate an EGR (Exhaust Gas Recirculation) valve and secondary air injection system to further reduce NOx emissions.
| Ignition and Electrical System |
Ignition is by direct coil-on-plug type with four independent ignition coils controlled by the ECU. Spark plugs are iridium-tipped long-reach type with a gap of 1.0 millimeter (0.039 inch). Typical plug specification is NGK IFR6E-11 or Denso equivalent. The replacement interval is 100,000 km (62,000 miles).
The alternator output is 100 amperes at 12 volts, and the starter motor is a 1.2 kilowatt reduction-gear unit. Grounding straps ensure low-resistance return paths for electrical systems. The ECU manages fuel, ignition, idle speed, and MIVEC cam phasing using inputs from crankshaft, camshaft, knock, and airflow sensors.
| Valve Timing Drive |
Camshafts are driven by a single roller chain with an automatic hydraulic tensioner and plastic guides. The timing chain ensures maintenance-free service over the engine’s life but should be inspected for elongation or noise beyond 200,000 km (124,000 miles).
In MIVEC versions, the intake camshaft phaser is oil-pressure controlled via a solenoid valve under ECU regulation, adjusting timing for optimal performance and emissions balance. Chain timing marks and alignment notches facilitate precise reassembly during major service.
| Other Systems |
0The Mitsubishi 4B10 is equipped with an electronically managed emissions system, including a PCV circuit, evaporative emission control (EVAP) system, and OBD-II diagnostics. The ECU continuously monitors oxygen, coolant temperature, and manifold pressure to maintain emissions compliance.
A knock control system retards ignition timing when detonation is detected, allowing the use of lower-octane fuels without engine damage. The idle air control and throttle body are integrated electronically to regulate airflow precisely. The MIVEC system in later models operates through a dedicated oil control solenoid, varying valve timing dynamically to optimize torque and minimize exhaust emissions.
| Dimensions and Weight |
The Mitsubishi 4B10 engine assembly measures approximately 620 mm (24.4 inches) in length, 640 mm (25.2 inches) in width, and 690 mm (27.2 inches) in height. Dry weight is around 127 kg (280 lbs) for the base model and approximately 130 kg (287 lbs) for the MIVEC version due to additional actuator components. Its compact design enables transverse installation in front-wheel-drive vehicles, with minimal intrusion into the passenger compartment. The lightweight aluminum construction contributes to improved front axle weight distribution and fuel economy.
| Maintenance Data |
Recommended intervals are as follows: engine oil and filter every 10,000 km (6,000 miles); air filter every 20,000 km (12,000 miles); spark plugs every 100,000 km (62,000 miles); coolant every 160,000 km (100,000 miles); and accessory belt inspection every 40,000 km (25,000 miles).
Valve clearances are self-adjusting through hydraulic lash lifters, but inspection at 100,000 km (62,000 miles) is advised. Compression pressure for each cylinder should measure approximately 1,300 kPa (190 psi) with a minimum limit of 1,000 kPa (145 psi) and a maximum variation of 100 kPa (15 psi) between cylinders.
| Tightening Torques |
Cylinder head bolts: 30 Nm (22 lb-ft) initial, then 60 Nm (44 lb-ft),
followed by a 90-degree turn.
Main bearing cap bolts: 55 Nm (41 lb-ft) plus 90 degrees.
Connecting rod bolts: 40 Nm (30 lb-ft) plus 90 degrees.
Camshaft bearing cap bolts: 10 Nm (7 lb-ft).
Crankshaft pulley bolt: 180 Nm (133 lb-ft).
Flywheel bolts: 85 Nm (63 lb-ft).
Oil pump cover bolts: 9 Nm (7 lb-ft).
Intake manifold bolts: 25 Nm (18 lb-ft).
Exhaust manifold nuts: 35 Nm (26 lb-ft).
Valve cover bolts: 9 Nm (7 lb-ft).
Spark plugs: 25 Nm (18 lb-ft).
Drain plug: 40 Nm (30 lb-ft).
| Vehicle Applications |
The 4B10 engine has been installed in a
variety of Mitsubishi vehicles, including:
– Mitsubishi Lancer (CY series, 2007–2017)
– Mitsubishi Galant Fortis (2007–2015)
– Mitsubishi ASX / RVR / Outlander Sport (2010–2018)
– Mitsubishi Eclipse Cross (base versions in some markets)
– Proton Inspira (Malaysia, 2010–2015, license-built Lancer)
– Dodge Caliber and Jeep Compass/Patriot (World Engine derivatives)
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