[China Aluminum Network] Some netizens ask professors, can you talk about aluminum engines and cast iron engines? One of the three major items we paid attention to when buying a car, today we focus on the characteristics of the two materials engine. In the development of automotive engine materials, from full cast iron to cylinder head aluminum cylinder cast iron, and now to the market, most use aluminum engines, which is undoubtedly a material technology advancement. First of all, the engine benefits of aluminum cylinders are light! Compared with cast iron, it can reduce about 20 kilograms, greatly reducing the weight of the car, so as to achieve the purpose of energy saving. Secondly, the aluminum engine has enough heat to conduct heat. It is necessary to know that 90% of the engine wear is at startup, so the aluminum engine can effectively reduce wear and increase engine life. In addition, for manufacturers, aluminum engines are easier to process and can reduce manufacturing costs. Since the aluminum engine is so good, why is there so much ironmaking engine now? Although the aluminum engine has many advantages, the big drawback compared to the cast iron engine is that it is very disappointing that it is resistant to high temperatures, so if the engine with a large power is difficult to use the aluminum engine. For example, all Volkswagen new cars such as Polaris, Sagitar, etc. have adopted aluminum engines, but Golf GTI and Scirocco R have used cast iron cylinder engines. In addition, compared to cast iron, aluminum is more susceptible to thermal expansion, affecting the compactness of the engine compartment, and aluminum is more likely to produce chemical reactions in the cylinder, which is easier to wear than the cast iron and affect the engine performance. However, many OEMs have enhanced the engine block for aluminum, such as BMW's N20B20 engine (2.0T high-power version), and use a type of arc wire spray coating on the cylinder wall. A high-temperature arc is generated at high voltage to melt the metal iron, and iron is sprayed on the aluminum alloy cylinder wall by high-pressure air. The iron coating can effectively increase the strength of the cylinder wall so that the aluminum engine can also withstand more power like cast iron. So the conclusions are: Shopping carts are generally all-aluminum engines, and if the shopping carts are cast iron, they must think clearly. High-performance vehicles also have all-purpose aluminum, but they must have iron coatings. Therefore, the combination of aluminum and iron is better, but their expansion coefficients are not uniform, and the technical requirements of automobile companies are quite high. No coating technology, but also want high power, will use cast iron cylinder engine. Therefore, it is not necessary for us to entanglement whether the engine is made of cast iron or aluminum. After all, this material has its advantages and disadvantages. It is certainly better to use an all-aluminum engine. Cast iron cylinders do not need to be too tangled, you can tell people, do you want to compare engine power?