Mitsubishi 6G73 2.5 liter engine has been widely used in various Mitsubishi and Chrysler models. It has a good potential to increase power to 300+ hp, although this will require serious modification. Reliable and durable engine with a resource of about 400 thousand kilometers with proper care.
Characteristics of Mitsubishi 6G73 engine
| Parameter | Value |
|---|---|
| Manufacturing | Kyoto engine plant |
| Engine make | 6G7 / Cyclone V6 |
| Years of production | 1990-2002 |
| Cylinder block material | Cast iron |
| Power system | Injector |
| Type | V-shaped |
| Number of cylinders | 6 |
| Valves per cylinder | 4 |
| Piston stroke, mm | 76 |
| Cylinder diameter, mm | 83.5 |
| Compression ratio | 9.4 (10-11 for DOHC GDI) |
| Engine displacement, cc | 2497 |
| Power, hp/rpm | 164-175 at 5900-6000 / 200 at 6000 (DOHC GDI) |
| Torque, Nm/rpm | 216-222 at 4000-4500 / 250 at 3500 (DOHC GDI) |
| Engine weight, kg | ~195 |
| Oil consumption, gr./1000 km | to 1000 |
| Oil volume in the engine, l | 4.3 |
| Oil change, km | 7000-10000 |
| Operating temperature, °C | ~90 |
| Engine life, thousand km | 400+ |
| Tuning, hp (potential) | 300+ |
| Tuning without loss of resource | – |
| Application | Mitsubishi Galant, Mitsubishi Diamante, Chrysler Cirrus, Chrysler Sebring, Dodge Avenger, Dodge Stratus |
Mitsubishi 6G73 2.5 engine design and repair
The small 6-cylinder engine of the Cyclone family (its other representatives: 6G71, 6G72, 6G74 and 6G75) appeared in 1990 and was a 6G72 with smaller diameter cylinders (83.5 mm, vs. 91.1 mm). The compression ratio is 9.4. The cylinder heads are single-shaft SOHC 24V with hydrocompensators. Diameter of inlet valves is 33 mm, exhaust valves 29 mm. The power of this engine was 164-166 hp and they were put on Chrysler Cirrus, Sebring and Dodge Avenger.
Later, the compression ratio was increased to 10, and the power increased to 170-175 hp. Such motors were put on Mitsubishi Galant and Diamant. The most powerful version had DOHC 24V head with direct fuel injection system GDI, compression ratio was increased to 11. Such power unit was installed on Mitsubishi Diamante.
The timing system uses a belt, replacement of the timing belt is required every 90 thousand kilometers. Together with it the roller and pump are changed.
The 6G73 was produced until 2002, after which it was removed from production.
Problems and disadvantages of Mitsubishi 6G73 2.5 engines
- High oil consumption. Given the age of the engine, most likely the problem is in the oil rings and caps. It is necessary to check, buy new rings and caps and carry out 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 monitor the oil level.
- The idle speed is floating. Check the idle speed regulator, most often the problem is in it. After that, inspect the state of the throttle valve, possibly need 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 of 6G72 engine is on the average 400 and more thousand kilometers, with normal maintenance.
Mitsubishi 6G73 engine tuning
Having in the Cyclone V6 series excellent engine 6G72TT, to refine a dead-end 6G73 is simply a crime.
ENGINE RATING: 4