Most traditional engines have one intake valve and one exhaust valve per cylinder. This two-valve valve mechanism is relatively simple and has low manufacturing cost. For ordinary engines that do not require high output power, they can obtain relatively good results. Satisfactory engine output power and torque performance. Engines with larger displacement and greater power should adopt multi-valve technology. The simplest multi-valve technology is a three-valve structure, which is a two-valve structure with one intake and one row plus an intake valve.

On January 29, 1886, the German Karl Benz installed the four-stroke single-cylinder fuel engine he developed into a three-wheeled car and obtained the patent. From this day on, the world really had cars. It can be said that the engine created the car. The basic structure of the engine is composed of cylinder 1, piston 2, connecting rod 3, crankshaft 4 and other major parts. Each cylinder has at least two valves, an intake valve (blue) and an exhaust valve (orange).

With the development of technology, the speed of automobile engines has become higher and higher. The speed of modern car engines can generally reach more than 5,500 revolutions per minute. It only takes 0.005 seconds to complete the four working processes. The traditional two-valve system is no longer capable of such tasks. Completing the ventilation work in a short period of time limits the improvement of engine performance. The only way to solve this problem is to expand the space for gas entry and exit. In other words, space is traded for time. Multi-valve technology is the best way to solve the problem. It was not until the promotion of multi-valve technology in the 1980s that the overall quality of the engine made a qualitative leap.