Therefore, at present, the multi-car engine fuel valve in each cylinder valve number are 3-5, which went four-valve is most common. The gasoline engine as an example, the multi-valve engine with the traditional two-valve engine, the former can be sucked into the air to mix more fuel combustion for power, fuel savings, faster emissions, less pollution emissions to increase the engine's power and the advantages of reducing noise, with the improvement of the environment and direction of development of energy-saving, multi-valve technology can rapidly widely.

Multi-valve engine that fuel the rise of the beginning, some people think that it has a low technical flaws do not operate smoothly, the Boer, a German car company for the holders of this view. With technical improvements, multi-valve gas engines such technical defects have gradually overcome.

Boer for the past few years the company's 944 S2 cars loaded with a four-cylinder four-valve engine, now, the world almost all the high-class cars are equipped with multi-valve engine fuel.