Is the plastic or aluminum alloy of automobile valve better?

Automobile valve, also known as throttle, is responsible for injecting fuel into the engine and discharging exhaust gas. The traditional engine has only one intake valve and one exhaust valve per cylinder. This design has the advantages of simple structure, low cost, convenient maintenance and good low speed performance.

The disadvantage is that the power is difficult to improve, especially at high speed, the inflation efficiency is low and the performance is weak. In order to improve the efficiency of intake and exhaust, multi-valve technology is often used. It is common that each cylinder is equipped with four valves (there are also three or five valves in a single cylinder, and the principle is the same, such as the engine of Audi A6), and the four cylinders are 16 valves. The "16V" we often see in automobile data is the engine * * * 65438+.

This multi-valve structure is easy to form a compact combustion chamber, and the fuel injector is arranged in the center, so that the fuel-air mixture burns faster and more evenly, and the weight and opening of each valve can be reduced appropriately, so that the valves can be opened or closed faster.