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Mitsubishi 4A92 Specifications
| Engine Model: Mitsubishi 4A92 |
| Engine Type: 4-cycle inline 4-cylinder DOHC 16-valve liquid-cooled gasoline |
| Total Displacement: 97.1 cu.in (1.59 L) |
| Rated Engine Power: 117 Hp (86 kW) at 6000 rpm |
| Fuel System Type: Multi-point electronic fuel injection |
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| General Technical Data |
The Mitsubishi 4A92 is a 1.6-liter inline four-cylinder gasoline engine that belongs to the 4A9 family jointly developed by Mitsubishi Motors and Daimler-Chrysler. Introduced in the late 2000s, the 4A92 was designed to replace the older 4G1-series small-displacement engines, offering improved thermal efficiency, reduced emissions, and lower weight.
This modern unit incorporates an all-aluminum
construction, dual overhead camshafts, and Mitsubishi’s MIVEC
(Mitsubishi Innovative Valve timing Electronic Control) system for
variable valve timing on both intake and exhaust camshafts in later Euro
5/6 versions. The engine has been widely used in compact passenger
vehicles such as the Mitsubishi Lancer, ASX, Colt Plus, and Mirage, as
well as some Chinese-market sedans manufactured under the Soueast and
Zotye brands.
The 4A92 is characterized by its lightweight aluminum design,
chain-driven camshafts, and emphasis on balance between power output,
efficiency, and reliability. It is part of a new generation of global
engines that meet Euro 4, Euro 5, and Euro 6 emissions standards,
providing clean combustion and smooth performance.
Its refined characteristics, low noise, and
vibration levels make it ideal for urban and highway driving. In
naturally aspirated form, the 4A92 delivers around 117 Hp (86 kW, 115
bhp) and 154 Nm (114 lb-ft) of torque, achieving a compression ratio of
approximately 11.0:1. Later iterations with MIVEC and improved ECU
tuning provide enhanced throttle response and lower CO2 emissions.
The Mitsubishi 4A92 engine has a total displacement of 1,590 cc (97.1
cubic inches), achieved through a bore of 75.0 mm (2.95 inches) and a
stroke of 90.0 mm (3.54 inches). This undersquare configuration
prioritizes low- and mid-range torque while maintaining efficiency at
moderate engine speeds. The compression ratio varies from 10.7:1 to
11.0:1 depending on the emission standard and regional calibration. The
firing order is 1-3-4-2, and the crankshaft rotates clockwise when
viewed from the flywheel end.
The engine block and cylinder head are both made from aluminum alloy to
reduce overall weight and improve heat dissipation. The block features
cast-iron cylinder liners for wear resistance and a deep skirt design
for rigidity. The crankshaft is forged steel with five main bearings,
ensuring smooth rotation and durability. The connecting rods are
lightweight forged steel units with floating wrist pins, while the
pistons are aluminum alloy with molybdenum-coated skirts and
low-friction rings. This combination provides excellent mechanical
efficiency and minimizes reciprocating mass.
The valvetrain employs dual overhead camshafts (DOHC) operating four
valves per cylinder, totaling sixteen valves. Valve diameters are
approximately 31 mm (1.22 in) for intake and 26 mm (1.02 in) for
exhaust. The camshafts are driven by a single-row roller timing chain
with an automatic hydraulic tensioner.
The MIVEC system continuously varies the phase
of the intake and exhaust camshafts according to load and rpm,
optimizing torque and fuel efficiency. Non-MIVEC variants employ fixed
timing but share the same mechanical structure. Hydraulic lash adjusters
are not used; instead, valve clearance adjustment is achieved via
shim-type tappets.
The 4A92’s maximum output is approximately 86 kW (117 PS, 115 bhp) at
6,000 rpm, with maximum torque of 154 Nm (114 lb-ft) at 4,000 rpm. The
engine redline is set at 6,500 rpm with an electronic fuel cut-off
around 6,800 rpm. Idle speed is electronically controlled between 700
and 750 rpm. The engine’s specific power output averages around 73 hp
per liter, which is competitive for a naturally aspirated 1.6-liter
engine of its era.
| Fuel System |
The Mitsubishi 4A92 utilizes a multi-point electronic fuel injection (EFI) system. An electric fuel pump located in the fuel tank supplies fuel through a pressure-regulated line to the injectors mounted in the intake manifold near the intake ports. The system operates at approximately 350 kPa (50 psi).
Each injector is solenoid-actuated and precisely controlled by the
engine control unit (ECU) for injection duration and timing. The ECU
receives signals from sensors including the mass air flow (MAF) sensor,
throttle position sensor, manifold absolute pressure (MAP) sensor,
oxygen sensor, and engine coolant temperature sensor to optimize the
air-fuel ratio.
The fuel used is unleaded gasoline with an octane rating of at least 95
RON (91 AKI). Fuel injector cleaning or replacement is recommended every
80,000 km (50,000 miles), and the fuel filter should be replaced every
40,000 km (25,000 miles). The 4A92 complies with Euro 4 and Euro 5
emission standards through the use of a three-way catalytic converter,
oxygen sensors, and precise mixture control. The Euro 6 versions
incorporate improved injector atomization and catalyst efficiency to
further reduce emissions.
| Lubrication System |
The lubrication system is a pressurized wet-sump type using a trochoid oil pump driven by the crankshaft. Oil is drawn through a strainer from the sump and delivered under pressure to the crankshaft bearings, connecting rods, camshafts, and valve train components. The system includes a full-flow spin-on oil filter mounted on the block’s side.
Oil pressure is approximately 350 to 500 kPa (51–73 psi) at 3,000 rpm
and about 100 kPa (15 psi) at idle. Oil capacity with filter replacement
is 3.3 liters (3.5 US quarts, 2.9 Imperial quarts). Recommended oil
grades are SAE 5W-30 or 0W-20 meeting API SN or higher standards. A
positive crankcase ventilation (PCV) valve recirculates blow-by gases
into the intake for combustion, reducing emissions and oil
contamination.
Regular oil and filter changes are specified every 10,000 km (6,000
miles) or every six months under normal operation. Under severe driving
conditions such as frequent short trips, dusty environments, or
high-load operation, oil changes should be performed every 5,000 km
(3,000 miles). Proper oil maintenance is crucial to avoid premature wear
of camshaft bearings and timing chain components.
| Cooling System |
0The cooling system is a pressurized liquid-cooling circuit designed to maintain stable operating temperature. A belt-driven centrifugal water pump circulates coolant through the cylinder block, head, radiator, and heater core. The thermostat begins to open at 82 C (180°F) and is fully open at around 95°C (203°F). The aluminum cross-flow radiator is paired with an electric fan controlled by the ECU based on coolant temperature and air conditioning load.
Coolant capacity is approximately 6.0 liters (6.3 US quarts, 5.3 Imperial quarts). The system uses a 50/50 mixture of ethylene glycol antifreeze and distilled water, providing freeze protection down to –35°C (–31°F). Coolant replacement interval is 60,000 km (37,000 miles) or every three years.
| Intake and Exhaust Systems |
The intake system consists of a plastic air cleaner box, resonator, and long-runner intake manifold designed to enhance low-speed torque. The throttle body is electronically controlled (ETACS) and connected to the accelerator pedal sensor, allowing smooth response and idle stability. The air filter is a dry paper element replaced every 20,000 km (12,000 miles).
The exhaust system features a stainless-steel manifold integrated with a catalytic converter to promote fast warm-up and emission reduction. Secondary oxygen sensors downstream of the catalyst monitor efficiency and feed data to the ECU. The exhaust gas recirculation (EGR) system is employed in Euro 5/6 models to reduce nitrogen oxide emissions by reintroducing a small volume of exhaust gases into the intake charge.
| Ignition and Electrical System |
The ignition system uses coil-on-plug direct ignition. Each spark plug has its own ignition coil controlled by the ECU. Spark plugs are iridium-tipped for longevity, with a specified gap of 1.0 millimeter (0.039 inch). Spark plug replacement is recommended every 90,000 km (56,000 miles). The alternator is rated at approximately 100 amperes, and the starter motor output is around 1.0 kilowatt.
The electrical system operates on 12 volts DC, with a battery capacity of 45–60 ampere-hours. The ECU controls ignition timing, fuel delivery, throttle actuation, and variable valve timing simultaneously, optimizing engine performance and emissions.
| Valve Timing and Drive Mechanism |
The timing system employs a roller chain that drives both camshafts from the crankshaft via an intermediate sprocket. The chain tension is maintained automatically by a hydraulic tensioner that uses engine oil pressure to absorb slack and minimize noise. The MIVEC phasers, mounted on both camshafts in later versions, adjust valve opening and closing angles dynamically.
The system is capable of advancing or retarding valve timing up to 40 degrees of crankshaft rotation, improving torque at low rpm and efficiency at high rpm. Timing chain inspection is recommended after 150,000 km (93,000 miles), though it is designed for the lifetime of the engine under normal use.
| Dimensions and Weight |
The Mitsubishi 4A92 engine measures approximately 610 mm (24.0 inches) in length, 620 mm (24.4 inches) in width, and 660 mm (26.0 inches) in height. The dry weight is about 115 kg (254 lbs), depending on accessories and emission equipment. The compact design allows for transverse installation in front-wheel-drive vehicles. The lightweight aluminum construction contributes to improved vehicle handling balance and reduced overall mass.
| Maintenance Data |
Recommended service 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 90,000 km (56,000 miles), and coolant every 60,000 km (37,000 miles). The valve clearance should be inspected every 100,000 km (62,000 miles) or when abnormal noise is observed.
The accessory drive belt must be checked for cracks or wear every 40,000
km (25,000 miles) and replaced as necessary. The timing chain requires
periodic inspection for tensioner condition but is generally
maintenance-free.
Standard compression pressure for each cylinder is approximately 1,350
kPa (196 psi) at 300 rpm, with a minimum acceptable limit of 980 kPa
(142 psi). The maximum allowable difference between cylinders is 100 kPa
(15 psi). Idle speed is maintained electronically between 700 ± 50 rpm.
Proper adherence to these maintenance intervals ensures long service
life exceeding 250,000 km (155,000 miles).
| Tightening Torques |
Cylinder head bolts: 40 Nm (30 lb-ft) plus 90 degrees, then an
additional 90 degrees.
Main bearing cap bolts: 60 Nm (44 lb-ft).
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).
Spark plugs: 25 Nm (18 lb-ft).
Oil drain plug: 40 Nm (30 lb-ft).
Intake manifold bolts: 25 Nm (18 lb-ft).
Exhaust manifold nuts: 35 Nm (26 lb-ft).
Engine mount bolts: 60 Nm (44 lb-ft).
| Vehicle Applications |
The Mitsubishi 4A92 engine has been widely
used across various Mitsubishi and partner models, including:
– Mitsubishi Lancer (CY series, 2007–2020)
– Mitsubishi ASX / Outlander Sport (GA1W, 2010–present)
– Mitsubishi Colt Plus (Z2, 2008–2012)
– Mitsubishi Mirage G4 / Attrage (2013–present, certain markets)
– Soueast V3 Lingyue (China)
– Zotye Z300 and Z500 sedans (China)
The engine’s combination of performance, economy, and compact design
made it ideal for global applications, from entry-level sedans to
compact crossovers. Euro 6-compliant versions introduced improved
emission control, enhanced MIVEC logic, and lighter internal components
for better fuel efficiency and smoother operation.
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