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Mitsubishi 4G93 Specifications
| Engine Model: Mitsubishi 4G93 |
| Engine Type: 4-cycle inline 4-cylinder SOHC or DOHC liquid-cooled gasoline |
| Total Displacement: 111.9 cu.in (1.83 L) |
| Rated Engine Power: 110-170 Hp (82-127 kW) at 6000 rpm |
| Fuel System Type: Carburetor or multi-point fuel injection |
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| General Technical Data |
The Mitsubishi 4G93 engine is a 1.8-liter inline-four gasoline powerplant developed within the Mitsubishi Orion engine family. Produced for a wide range of global markets from the early 1990s through the 2000s, it appeared in numerous passenger cars, wagons, crossovers, and compact multipurpose vehicles. Known for its versatility, the 4G93 was manufactured in multiple configurations, including SOHC, DOHC, MPI, GDI, LPG, and turbocharged variants.
This broad selection allowed Mitsubishi to tailor the engine to regional emissions regulations, fuel quality, performance expectations, and market preferences. Cast-iron cylinder-block construction gave the engine strong durability, while aluminum cylinder heads with various valvetrain layouts provided reliable performance.
The 4G93 became widely recognized for balanced
torque delivery, reasonable fuel consumption, and straightforward
maintenance procedures. Workshop technicians valued the engine for its
accessibility, rebuildability, and dependable long-term operation across
all versions.
The Mitsubishi 4G93 engine displaces 1,834 cc, equal to 111.9 cubic
inches. Bore measures approximately 81.0 mm (3.19 inches), while stroke
is approximately 89.0 mm (3.50 inches). This long-stroke configuration
optimizes torque output across low and mid-range engine speeds.
Compression ratios vary considerably depending on version: approximately 9.0 to 1 in early SOHC models; 9.5 to 1 to 10.0 to 1 in DOHC MPI variants; 11.0 to 1 to 12.0 to 1 in GDI engines; and reduced ratios in turbocharged configurations. Power output spans a wide range from 110 to over 170 horsepower (82 to 127 kW) depending on induction, camshaft layout, and ECU tuning.
Torque values typically fall between 150 and
225 Nm (111 to 166 lb-ft). Idle speed is generally stabilized around 750
rpm. Redline varies between 6,000 and 7,000 rpm depending on valvetrain
and ECU programming. The engine uses a conventional firing order of 1 3
4 2 and operates on the four stroke Otto cycle with electronically
controlled ignition and fuel delivery.
The cylinder block is cast iron for all versions of the 4G93. Its rigid
design ensures long-term durability and consistent cylinder-wall
geometry under repeated thermal cycling. The forged-steel crankshaft is
supported by five main bearings for smooth rotation and reduced
vibration. Pistons vary by version: standard MPI and SOHC versions use
cast aluminum alloy pistons with coated skirts; GDI versions use
reinforced-crown pistons designed to handle higher compression; and
turbocharged variants incorporate strengthened ring lands and optimized
cooling channels.
The connecting rods are forged steel with
full-floating wrist pins for reduced friction and increased fatigue
resistance. The ring pack includes two compression rings and one
oil-control ring tailored for each variant-s thermal and combustion
loads. Internal oil galleries distribute lubrication to the crankshaft,
rod bearings, piston pins, and cylinder walls. The block is designed for
ease of overhaul.
Cylinder-head design varies across the 4G93 family. SOHC versions use
eight-valve or twelve-valve heads depending on regional specification.
DOHC versions employ sixteen valves with bucket-over-shim tappets or
hydraulic lash adjusters. GDI versions use DOHC layouts with specialized
combustion chambers optimized for direct injection and swirl generation.
Turbocharged variants use similar DOHC heads but with enhanced cooling
passages and in some cases sodium-filled valves.
Intake-valve diameters vary depending on airflow requirements, while exhaust-valve materials are heat-resistant alloys suitable for sustained high-temperature operation. Combustion chambers follow pent-roof architecture for efficient air-fuel mixing and strong flame propagation. Camshafts are driven by a timing belt requiring replacement at scheduled intervals.
| Fuel System |
The fuel system differs among 4G93 versions. Early SOHC models use carburetion or single-point injection. MPI versions use sequential multi-point injection with fuel pressure typically around 300 to 350 kPa (43 to 51 psi).
GDI versions use high-pressure mechanical pumps producing 5 to 6 Mpa (725 to 870 psi) for direct injection. Turbocharged versions use high-flow injectors and revised regulators. Recommended fuel ranges from 92 RON (87 AKI) for MPI versions to 95 RON (91 AKI) or higher for GDI and turbocharged versions.
| Lubrication System |
The lubrication system is a full-pressure wet-sump design using a crankshaft-driven oil pump. Oil capacity ranges from 3.7 to 4.5 liters (3.9 to 4.7 US quarts). Recommended oil viscosities include 5W 30 or 10W 30 for MPI and SOHC versions, and synthetic oils for GDI and turbocharged versions. Oil pressure ranges from 300 to 400 kPa (44 to 58 psi). Workshop maintenance includes oil-pressure testing and PCV inspection.
| Cooling System |
Cooling is achieved via a belt-driven water pump, aluminum radiator, thermostat, hoses, and electric cooling fans. Coolant capacity ranges from 5.5 to 7.0 liters (5.8 to 7.4 US quarts). System pressure is between 12 and 15 psi. Workshop tasks include radiator-flow checks, coolant replacement, thermostat evaluation, and hose inspection.
| Intake and Exhaust Systems |
Induction layouts differ across versions. SOHC MPI engines use basic intake manifolds. DOHC engines use tuned-runner intake manifolds. GDI engines incorporate swirl-inducing runners.
Turbocharged versions use intercoolers and upgraded intake components. Exhaust systems range from cast-iron manifolds to turbocharger housings. All versions use catalytic converters and O2 sensors.
| Ignition and Electrical System |
Ignition ranges from distributor systems in early versions to distributorless and coil-on-plug ignition in later MPI, GDI, and turbocharged versions. Spark plugs vary from copper-core types to iridium types. Alternator outputs range from 65 to 90 amperes.
| Other Systems |
Additional systems include PCV, EVAP, and EGR depending on market. Accessories include alternator, A/C compressor, and power-steering pump. Sensors include crank-angle, cam-angle, intake-air-temperature, coolant-temperature, manifold-pressure, and O2 sensors.
| Dimensions and Weight |
Length is 630 to 660 mm (24.8 to 26.0 inches). Width is 550 to 580 mm (21.7 to 22.8 inches). Height is 650 to 680 mm (25.6 to 26.8 inches). Dry weight is 115 to 140 kg (254 to 309 lbs).
| Maintenance Data |
Oil and filter changes occur every 7,500 to 10,000 km (4,600 to 6,200 miles). Air-filter replacement every 15,000 to 20,000 km. Spark-plug inspection every 20,000 km. Coolant replacement every 40,000 km. Timing belt every 90,000 to 100,000 km. GDI versions require intake-valve cleaning.
| Tightening Torques |
Cylinder-head bolts: 30 Nm (22 lb-ft) plus angle. Main-bearing caps: 65 to 75 Nm (48 to 55 lb-ft). Rod bolts: 40 Nm (30 lb-ft) plus angle. Spark plugs: 18 to 20 Nm. Oil-drain plug: 35 Nm. Intake-manifold bolts: 22 to 25 Nm. Exhaust-manifold bolts: 25 to 30 Nm.
| Vehicle Applications |
The 4G93 appeared in Mitsubishi Lancer, Mirage, Colt, Libero, Galant, Carisma, RVR, and regional models in Asia, Europe, and South America. Its wide variations allowed use in sedans, hatchbacks, wagons, MPVs, and crossovers.
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