Features of the operation of cars with Mitsubishi GDI engines

Cars with engines of the Mitsubishi GDI system have been in operation in the CIS for almost ten years, but among car enthusiasts there is still no consensus on such cars. A number of car owners consider these cars almost perfect, but there is a separate category of motorists, whose representatives consider Mitsubishi GDI to be a crude and under-developed system that requires constant maintenance.

As practice shows, a properly working GDI motor has a higher power than its standard counterparts. In addition, this type of engine is characterized by a higher fuel economy. So, is it worth buying a car with GDI? Let's try to understand this question in more detail.

The main difference between GDI is the use of high fuel pressure. Such cars have two fuel pumps (mechanical and electric). The electric pump is located in the tank and serves to deliver the initial pressure (3.5 Atm.) To the mechanical fuel pump. The latter is located under the hood of the car and has a drive from the camshaft of the power unit. The resulting pressure mechanical fuel pump increases to 55 Atm. And sends to the injectors, with the help of which the fuel is injected into the cylinders. Using such a scheme significantly improves the quality of the air-fuel mixture.

However, the continuous and uninterrupted operation of a mechanical fuel pump can be ensured only if a clean fuel is used that does not have foreign impurities. Otherwise, dirt and impurities quickly clog the internal cavities of the pump, disabling it. This problem is successfully solved by installing an additional fuel filter, which must be changed every 5 thousand km. Mileage. In addition, it is necessary to constantly monitor the condition of the four fine fuel filters located in the internal cavities of the mechanical fuel pump. Only in this case it will work without interruptions.

The Mitsubishi GDI engine is also distinguished by the modified design of the connecting rod-piston group, which provides a higher compression (up to 15 Atm.). The operating life of such motors is very large, the interval between major repairs is usually about 400 thousand km. The most common faults GDI motors are considered to be an increase in oil consumption and the appearance of detonation, during which the exhaust gases of cars can be painted black.

Increase in oil consumption usually occurs due to the failure of the gland valves located in the zone of high thermal load. The occurrence of detonation and black smoke can be associated with the work of the exhaust afterburning system. The thing is that the afterburning system constantly takes exhaust gases out of the exhaust system and sends them through the intake manifold to re-incineration into the cylinders. During the passage through the intake manifold , exhaust gases are filtered and some of the dirt from them settles on the walls of the collector. Over time, this layer becomes larger and begins to interfere with the normal passage of air. Black smoke and detonation occurs when the amount of incoming air is reduced, and the amount of fuel remains unchanged. Eliminate this problem by completely internal cleaning of the intake manifold, before which the collector needs to be dismantled from the vehicle.

Summarizing, we can say that the engines of the GDI system are still quite successfully used in domestic conditions. A lot of criticism about this system is usually explained by the banal ignorance of operational characteristics and characteristics.