https://www.wapcar.my/news/2020-proton-x50-has-2-turbo-engines-%E2%80%93-one-direct-injection-one-port-what%E2%80%99s-the-difference-5960
MPI advantages
simplicity of design. Obviously, such engines are simpler than power units equipped with TSIs with turbochargers, but not a carburetor type. The owners carry out a number of repairs on their own, without resorting to the help of service station specialists. Clear savings on monthly maintenance;
loyalty of the system to the quality of fuel. As applied to the CIS countries, where fuel is not always âgoodâ, this option is acceptable. The power unit runs quite comfortably on AI-92 gasoline;
average service life up to overhaul is 300,000 km. These figures are given by the manufacturer. In practice, the resource is less than 50,000 km. Few people take into account the factor of timely replacement of engine oil, cleaning elementsrefueling with high-quality fuel;
minimal risks associated with overheating;
the possibility of mechanical adjustment of the ignition timing;
the design provides for the presence of rubber mounts above the engine. This allows you to damp vibrations, vibrations during operation.
Disadvantages of MPI
increased fuel consumption. The factor is quite controversial, it can be interpreted in different ways. In comparison, it is increased by 7%. This frightens off many potential buyers, repels;
low torque, and as a result, an average power factor. The fuel mixture is mixed directly in the intake ports, not in the cylinders. This is atypical for most constructs and causes confusion among TSI constructors.
Technically it's cheaper engine compare to GDI engines and can safely run on lower octane fuel.
