What is a multi-valve engine maintenance expert interpretation

Gao Fei, head of a large auto repair shop, said that multi-valve engine means that the number of valves per cylinder is more than two, that is, three-valve type with two intake valves and one exhaust valve; two intake valves and two Four-valve exhaust valve; three intake valve and two exhaust valve five-valve type. The current multi-valve engine on the car is mostly four-valve.

The four-cylinder engine has 16 valves, the 6-cylinder engine has 24 valves, and the 8-cylinder engine has 32 valves. To increase the number of valves, it is necessary to increase the corresponding valve mechanism, and the structure is relatively complex, generally consisting of two overhead cams. The shaft controls the valves arranged on both sides of the centerline of the combustion chamber of the cylinder. The valve is arranged on the inclined sides of the center of the combustion chamber of the cylinder in order to maximize the diameter of the valvehead, improve the ventilation performance, and facilitate the rapid combustion of the mixture. .

Take the gasoline engine as an example. Compared with the traditional two-valve engine, the multi-valve engine can absorb more air to mix fuel combustion work, save fuel, and discharge the exhaust gas faster. It is in line with the development direction of optimizing the environment and saving energy. , so multi-valve technology can be quickly promoted.

When the multi-valve fuel engine began to rise, some people thought that it had a technical defect - low-speed operation was not smooth, and as the technology continued to improve, the technical defects of the multi-valve gas multi-valve gas engine also gradually Overcome. Now, almost all mid- to high-class cars in the world are equipped with multi-valve fuel engines.