3.0-liter V6 engine Mitsubishi 6G72 was produced at the plant in Kyoto from 1986 to 2018 and in addition to the models of the Japanese concern was put on Dodge and Chrysler, and also on Hyundai as G6AT. This power unit exists in five different modifications, including turbocharged.
Characteristics of Mitsubishi 6G72 engine
| Manufacturing | Kyoto engine plant |
|---|---|
| Engine make | 6G7/Cyclone V6 |
| Years in production | 1986-2008 |
| Cylinder block material | Cast iron |
| Power system | Injector |
| Type | V-shaped |
| Number of cylinders | 6 |
| Valves per cylinder | 2/4 |
| Piston stroke, mm | 76 |
| Cylinder diameter, mm | 91.1 |
| Compression Ratio | 8 (Turbo), 8.9 (SOHC 12V), 9 (SOHC 24V), 10 (SOHC 12V/DOHC 24V), 11 (GDI) |
| Engine displacement, cc | 2972 |
| Engine power, hp/rpm | 141-162/5000-5500 (SOHC 12V), 170-185/5000-5500 (SOHC 24V), 197-225/5500-6000 (DOHC 24V), 215-240/5500-5750 (DOHC 24V GDI), 280-324/6000 (DOHC 24V Turbo) |
| Torque, Nm/rpm | 232-250/3600-4000 (SOHC 12V), 255-265/4500 (SOHC 24V), 265-278/4500 (DOHC 24V), 299-304/3250-3500 (DOHC 24V GDI), 415-427/2500 (DOHC 24V Turbo) |
| Environmental regulations | up to Euro 4 |
| Motor weight, kg | ~200 (12V) |
| Fuel consumption, l/100 km | city: 17.0, highway: 11.0, mixed: 13.7 (for Pajero 2) |
| Oil consumption, g/1000 km | to 1000 |
| Engine oil | 0W-40, 5W-30, 5W-40, 5W-50, 10W-30, 10W-40, 10W-50, 10W-60, 15W-50 |
| How much oil in the engine, liters | 4.6 |
| Oil change is carried out, km | 7000-10000 |
| Engine operating temperature, deg. | ~90 |
| Engine life, thousand km | factory data: -, in practice: 400+ |
| Tuning, hp | potential: 1000+, without loss of resource: 350-400 |
Modifications
| Modification | 6G72 MPI SOHC 12V | 6G72 MPI SOHC 24V | 6G72 MPI DOHC 24V | 6G72 GDI DOHC 24V |
|---|---|---|---|---|
| Type | V-shaped | V-shaped | V-shaped | V-shaped |
| Number of cylinders | 6 | 6 | 6 | 6 |
| Number of valves | 12 | 24 | 24 | 24 |
| Exact volume | 2972 cm³ | 2972 cm³ | 2972 cm³ | 2972 cm³ |
| Cylinder diameter | 91.1 mm | 91.1 mm | 91.1 mm | 91.1 mm |
| Piston stroke | 76 mm | 76 mm | 76 mm | 76 mm |
| Power system | spread injection | distributed injection | direct injection | direct injection |
| Power | 140 – 160 hp | 170 – 185 hp | 195 – 225 hp | 215 – 240 hp |
| Torque | 230 – 250 Nm | 255 – 265 Nm | 265 – 280 Nm | 300 – 305 Nm |
| Compression ratio | 9.0 | 9.0 | 10 | 11 |
| Environmental standards | EURO 2 | EBRO 3 | EURO 3/4 | EURO 5 |
Which cars were equipped with Mitsubishi 6G72 engine
| Car Model | Years of production |
|---|---|
| Mitsubishi 3000GT 1 (Z16) | 1990 – 1993 |
| Mitsubishi 3000GT 2 (Z15) | 1993 – 2000 |
| Mitsubishi Diamante 1 (F1) | 1990 – 1996 |
| Mitsubishi Diamante 2 (F3) | 1995 – 2002 |
| Mitsubishi Galant 8 (EA) | 1999 – 2003 |
| Mitsubishi Eclipse 3 (D5) | 1999 – 2005 |
| Mitsubishi L200 2 (K10) | 1986 – 1996 |
| Mitsubishi L200 3 (K70) | 1996 – 2006 |
| Mitsubishi Pajero 1 (L040) | 1988 – 1991 |
| Mitsubishi Pajero 2 (V30) | 1991 – 2000 |
| Mitsubishi Pajero 3 (V70) | 1999 – 2006 |
| Mitsubishi Pajero 4 (V90) | 2006 – 2018 |
| Mitsubishi Pajero Sport 1 (K90) | 1996 – 2008 |
| Mitsubishi Delica 4 (PA) | 1994 – 2007 |
| Chrysler New Yorker 13 | 1988 – 1989 |
| Chrysler Town & Country 1 (AS) | 1989 – 1990 |
| Dodge Caravan 1 (AS) | 1987 – 1990 |
| Dodge Caravan 2 (ES) | 1990 – 1995 |
| Dodge Caravan 3 (GS) | 1996 – 2000 |
| Dodge Stratus 2 (JR) | 2000 – 2005 |
| Dodge Stealth 1 (Z16A) | 1990 – 1993 |
| Dodge Stealth 2 (Z15A) | 1993 – 1996 |
Mitsubishi 6G72 3.0 engine reliability, problems and repair
The Mitsubishi 6G7 family of six-cylinder engines was introduced in 1986 and consisted of the two-liter 6G71 and the larger 6G72, with a displacement of 3 liters. These were later joined by the 6G73, 6G74 and 6G75, with displacements of 2.5 liters, 3.5 liters and 3.8 liters respectively. But back to our three-liter 6G72. The cylinder block of this engine is V-shaped cast-iron with a camber angle of 60 degrees. Heads 6G72 aluminum, one camshaft for each and 12 valves (SOHC 12V). These heads are equipped with hydrocompensators and valve clearance adjustment is not required.
Later 24-valve cylinder heads with one camshaft (SOHC 24V) were installed, which increased the power up to 185 hp. Such engines were installed on Mitsubishi Pajero Sport/Challenger, L200, Delica and Diamante (200 hp).
Since 1990, the installation of twin-shaft 24-valve cylinder heads (DOHC 24V) began, it allowed to increase the output up to 200-222 hp. Motors with such heads were put on Mitsubishi Debonair, Eclipse, GTO/3000GT, Dodge Stratus, Stealth R/T and others. In addition, part of 24-valve cylinder heads was with direct fuel injection GDI, compression ratio on such motors was increased to 11, and power up to 240 hp.
In parallel with the atmospheric versions, a version 6G72TT with two turbochargers MHI TD04-09B and two intercoolers was produced. These engines differed from the usual 6G72 with a different intake, exhaust camshafts, ports, pistons for compression ratio 8, oil injectors, oil cooler, oil pan, sensors. The connecting rods on the 6G72 are no different, the injectors are 360 cc. There are 1G and 2G versions, the second one is more modern and slightly strengthened. Stock pressure of 6G72TT is 0.5 bar, power is 280 hp at 6000 rpm.
European models were equipped with TD04-13G turbochargers, boost pressure – 0.5 bar, power – 286 hp. The fastest versions Mitsubishi GTO/3000GT VR-4 and Dodge Stealth R/T twin-turbo had an output of 324 hp, boost pressure was 0.8 bar.
The timing mechanism uses a belt, replacement of the 6G72 timing belt, as well as the roller and pump, is carried out every 90 thousand kilometers. In case of belt breakage, 6G72 bends valves.
Production of the 6G72 continued for 22 years, after which the engine was replaced by the larger 6G75.
Problems and disadvantages of the engines
High oil consumption. Given the age of the engine, the oil rings and caps are most likely the problem. Need to check, buy new rings and caps and make repairs.
Engine knocking. Often the problem is related to hydrocompensators. Buy new hydrocompensators, remove the valve cover and replace. Sometimes the problem of knocking 6G72 is caused by rotating crank liners. In this case, it is very likely to get to the overhaul of the engine. Check and watch the oil level.
RPMs are floating. Check the idle speed regulator, most often the problem is in it. After that, inspect the condition of the throttle valve, perhaps it needs cleaning.
In addition, once every 100 thousand kilometers you need to replace the plugs on the 6G72. This procedure is difficult because of the need to remove the intake manifold. Along with this, it is necessary to inspect the flange of the intake manifold, possibly need grinding.
To protect yourself as much as possible from possible problems, the oil for the 6G72 should only be of high quality. Do not skimp on gasoline, and regularly undergo maintenance and your motor will drive long and without problems.
Resource and reliability of the engine 6G72
In general, motorists speak positively about 6G72 engines. These 3.0-liter units have good reliability, are unpretentious, there are no problems with the availability of spare parts, and some faults can be handled even in garage conditions. For some people, the weak side of this unit may seem low power and decent fuel consumption, but for durability and maintainability still have to pay something. The declared by the manufacturer resource of Mitsubishi 3.0 6G72 engine is 300 000 km of mileage, but with proper care it can easily go more than 400 000 km.
Mitsubishi 6G72 engine tuning
Chip tuning. Turbo
To start increasing the power of the 6G72 TT we need to buy a frontal intercooler, a block-off, an AEM or Mines ECU, a boost controller, a fuel pump from a Toyota Supra US, an Aeromotive fuel regulator, an exhaust all 3″. On this configuration, you can get about 400hp at 1 bar pressure and go significantly faster than stock. This will be the golden mean.
Further modify turbos or buy Garrett GT28 (or TD04-19T), buy forged piston, ARP studs, 750 cc injectors or better, refine the cylinder head, replace the fuel line with reinforced, buy another thick radiator, another oil cooler. After all that, your 6G72TT will drive like it should.
Stroker
There are several ways to increase the displacement of a 6G72 engine. The easiest is to buy a ready-made stroker kit, they usually increase displacement to 3.4 liters. The second way, in short: buy a 6G74 cylinder block, buy forged pistons 93 mm under compression ratio 8.5 or bore under 95 mm piston (which will give 3.6 liters). Along with this, buy Pauter connecting rods and cover the top with a 6G72 TT head, buy ARP studs, refine the sump.
Tuning of atmospheric versions of 6G72 (SOHC/DOHC/GDI) is not worth those expenses. It would be much more farsighted to buy a Mitsubishi 6G72 TT.
ENGINE RATING: 5-