4G64 Engine Review: Everything You Need to Know

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Mitsubishi Motors Corporation (MMC) is a Japanese car manufacturer, which is a division of the Mitsubishi Group, the biggest group of Japanese multinational companies. Since 2016, MMC pertains to Nissan, which is a member of the Renault-Nissan-Mitsubishi Alliance.

Mitsubishi Motors is known for its compact power units, in-line three, 4-cylinder and V6 engines. However, 4-cylinder gasoline engines remain the most widespread among the company’s product range. For instance, the 4G63 4-cylinder gasoline power-unit is the brand’s bestseller. One of a kind, named Saturn, is widely used by the South Korean automotive brand Hyundai.

Now let’s talk about the 4G64. Having a capacity of 2,351 cc (2.4 L), the 4G64 is one of the biggest engines (to be exact, the second biggest) of the brand. Previously, the automotive manufacturer deals with the construction of 8-valve SOHC motors and after, it started to manufacture the 16-valve SOHC and DOHC ones. All these engines used a Multi-Point Fuel Injection system as well as had a bore and stroke of 86.5 mm × 100 mm (3.41 in × 3.94 in).

Afterward, Mitsubishi produced 4G64 gasoline motors with direct injection. The engine, which is utilized for the Mitsubishi L200 car, has an output of 140 hp (104 kW; 142 PS) at 5,250 rpm with 161 lb-ft (218 N-m) of torque at 4,000 rpm. While being applied for the Chrysler Sebring/Stratus, its output reaches 152 hp (113 kW; 154 PS) at 5,500 rpm with 162 lb-ft (220 N-m) of torque at 4,000 rpm.

The variant of the engine, which is used for Chrysler, has fracture-split connecting rods made of forged powder metal. Unlike interference motors DOHC and SOHC 16-valve 4G64, the SOHC 8-valve 4G64 is a non-interference one. The LPG variant of the engine, which reaches 115 hp (86 kW; 117 PS) at 5,000 rpm, has been successfully employed in the Mitsubishi Canter since 1996.

4G64 Specs

Manufacturer	Shenyang Aerospace Mitsubishi Motors Engine Manufacturing Co Ltd Shiga Plant
Also called	Sirius
Production	1983-nowadays
Type	In-line
Valve per cylinder	MIVEC intake
Oil pump type	Involute gear type
Cooling system	Water-cooled forced circulation
Water pump type	Centrifugal impeller type
EGR system	Single type
Injector type and number	Electromagnetic 4
Injector identification mark	N275H
Throttle position sensor	Variable resistor type
Closed throttle position switch	Contact switch type, incorporated in idle speed control motor-TRUCK Movable contact type, incorporated in throttle position sensor – EXPO
Number of cylinders	2 4
Total displacement, cc	2,351
Cylinder bore mm	86.5
Piston stroke mm	100
Compression ratio	8.5 9 9.5 11.5
Power output h.p at rpm	112/5000 124/5000 132/5250 150/5000 150/5500
Torque output, Nm/rpm	184/3500 189/3500 192/4000 214/4000 225/3500
Fuel consumption, for Eclipse III city highway combined	10.2 7.6 8.8
Oil consumption, L/1000 km (qt. per miles)	up to 1.0 (1 qt. per 750 miles)
Recommended engine oil	0W-40 5W-30 5W-40 5W-50 10W-30 10W-40 10W-50 10W-60 15W-50
Engine oil capacity, L	4.0
Oil change interval, km (miles)	7,000-10,000 (4,500-6,000)
Engine lifespan, km (miles) -Official information -Real	– 400,000+ (245,000+)
Tuning, HP -Max HP -No life span loss	1000+ –

Valve timing

Intake valve Open BTDC	20” 19”
Intake valve Close ABDC	64” 57”
Exhaust valve Open BBDC	64” 57”
Exhaust valve Close ATDC	20” 19”

Torque specifications

	Nm	ft.1b.s.
Cooling fan bolt	11	8
Water pump pulley bolt – Engine without cooling fan	9	7
Water pulley bolt pump – Engine with cooling fan	11	8
Generator brace bolt	14	10
Generator mounting bolt	24	17
Generator pivot nut	23	17
Crankshaft pulley bolt	25	18
Spark plug	25	18
Distributor nut	11	8
Ignition coil bolt	14	10
Ignition power transistor nut	18	13
Tensioner bolt	49	35
Tensioner spacer	49	35
Oil pumps sprocket nut	55	40
Crankshaft sprocket bolt	120	87
Tensioner “B” bolt	19	14
Silent shaft sprocket bolt, right	46	33
Engine supports bracket bolt, left	36	26
Camshaft sprocket bolt	90	65
Throttle body bolt – SOHC	12	9
Fuel rail bolt	12	9
Fuel pressure regulator bolt	9	7
Throttle position sensor bolt	2	1.4
Idle speed control motor bolt	3.5	2.5
Idle air control motor bolt	3.5	2.5
Turbocharger waste gate actuator bolt	12	9
Bearing cap bolt M8x25 M8x65	24 20	17 14
Cylinder head bolt	95	69
Oil bolt	7	5
Oil filter bracket bolt	19	14

What cars have the 4G64?

• 1993-1997 Mitsubishi Chariot
• 1988–2006 Mitsubishi Delica/Van
• 1997-1999 Mitsubishi Eclipse GS Spyder Convertible FWD model equipped with a 141 hp (105 kW) 2.4 L 16-valve SOHC
• 2000-2005 Mitsubishi Eclipse
• 1994–2003 Mitsubishi Galant
• 1990–present Mitsubishi L200
• 1996–1998 Mitsubishi Magna (codenamed 4G64-S4 and fitted to the TE-TF series)
• 1990–1996 Mitsubishi Mighty Max
• 1998-2005 Mitsubishi Montero (V11 – 2 door) Latin America version
• 2001 Mitsubishi Airtrek
• 2003 Mitsubishi Outlander
• 1987–1990 Mitsubishi Sapporo
• 1986-2005 Mitsubishi Triton
• 2005 Mitsubishi Zinger
• 2003-2006 Kia Sorento 2.4i Manual
• 2004–present Brilliance BS6
• 2008–present Chery V5
• 1983–1992 Dodge Colt Vista (AWD only)
• 1990–1992 Dodge Ram 50
• 2006–present Great Wall Hover(X240 and V240)
• 1986-1998 Hyundai Grandeur
• 1989–1991 Hyundai Sonata
• 1999–2005 Hyundai Sonata
• 2001 Hyundai Santa Fe
• 2000–2005 Kia Optima
• 1998-2003 Mitsubishi Space Wagon

Sealant

	Specified sealant	Quantity
Rocker cover	3M ATD Part No. 8660 or equivalent	As required
Semi-circular packing	3M ATD Part No. 8660 or equivalent	As required
Oil pan gasket	MITSUBISHI GENUINE PART MD970389 or equivalent	As required
Engine coolant temperature gauge unit	3M ATD Part No. 8660 or equivalent	As required
Engine coolant temperature sensor	3M Nut Locking Part No. 4171 or equivalent	As required
Oil pressure switch	3M ATD Part No. 8660 or equivalent	As required
Oil pressure gauge unit	3M ATD Part No. 8660 or equivalent	As required

Mitsubishi 4G64 engine problems and reliability

The 4G64 motor is a copy of 4G63, but with bigger displacement. So, all the problems are identical.

 

4G64 tuning

DOHC + camshafts

To increase the capacity of the 4G64 without a turbine we need to remove the single-shaft cylinder head and buy a new head from the Hyundai Sonata 4 generation (G4JS motor) together with the intake manifold, modify it, remove the rough edges, align the channels.

In addition, we need to acquire the throttle from the Evo, the cold inlet, ARP studs, forged pistons for increased compression ratio (~ 11-11.5, for example Wiseco), the Eagle connecting rods, remove the balance shafts, camshafts to buy 272/272 with the split gear and reinforced springs, fuel rail from the Galant, nozzle with capacity of 440-450 cc, Walbro 255 pump, exhaust manifold 4-2-1 (4-1 possible), exhaust 2.5 “pipe, other extra small things and flashing. With all these components 4G64 engine power will rise up to 200+ hp.

4G64 Turbo (4G64T)

For further increase of the HP you need to inflate the engine. The easiest way is to buy a cylinder head from the Lancer Evolution, with all attachments, turbine, intercooler, fan, collector, exhaust, which should be finalized by the right vehicle. In addition, improvements will require the establishment of the oil channels for the turbine, also you will need an ARP studs, turbo camshafts 272 with the split gear and reinforced valve springs, forged piston (compression ratio ~ 8.5-9), the Eagle connecting rods, you need to remove the balance shafts, buy jets from Evo 560 cc or more productive, Walbro pump 255. After setting you’ll get 400+ hp.

For increasing torsionity of the 4G64, it is necessary to replace the crankshaft by 88 mm from the Evo or the lightweight, 156 mm rods (titanium for high-power) and to chisel cylinders up to 87 mm, in the amount of 2.1 it will give you a very high revving engine. You can put a Garrett GT42 with all the attendant things and go quietly well … on a straight line of course.

Mitsubishi 4G64 engine for sale