Is the car engine good for aluminum or iron?

Advantages of aluminum: At present, the cylinders of gasoline engines are divided into cast iron and cast aluminum. In diesel engines, cast iron cylinders account for the majority. In recent years, with the rapid development of the automobile industry, cars have quickly entered the lives of ordinary people. At the same time, the fuel-saving performance of vehicles has gradually been taken seriously. Reducing the weight of the engine can save fuel. The use of cast aluminum cylinders can reduce the weight of the engine.

From the point of view of use, the advantage of the cast aluminum cylinder body is its light weight, which saves fuel by reducing weight. In an engine of equivalent displacement, using an aluminum cylinder engine can reduce the weight of about 20 kg. Every 10% reduction in the car's own weight, fuel consumption can be reduced by 6% to 8%. According to the latest information, the weight of foreign cars themselves has been reduced by 20% to 26% compared with the past. Fox, for example, uses all-aluminum alloy materials to reduce the weight of the car, while also enhancing the engine's cooling effect, improving the engine's working efficiency, and having a longer life. From a fuel-saving perspective, the advantages of cast aluminum engines in fuel economy have attracted considerable attention.

In addition to the difference in weight, there are many differences between the cast iron cylinder and the cast aluminum cylinder in the production process. The cast iron production line covers a large area, has large environmental pollution, and has a complicated processing process. The production characteristics of cast aluminum cylinders are the opposite. From the perspective of market competition, cast aluminum cylinders have certain advantages.

The advantages of iron: The physical properties of iron and aluminum are different. The heat load capacity of the cast iron cylinder is stronger, and the potential for cast iron is greater in terms of engine power. For example, the output power of a 1.3-liter displacement cast iron engine can exceed 70 kW, while the output power of a cast aluminum engine can only reach 60 kW. It is understood that the 1.5-liter displacement cast iron engine can achieve the power requirements of a 2.0-liter displacement engine through turbocharging and other technologies, while the cast aluminum cylinder engine is difficult to meet this requirement. Therefore, many people can also produce amazing torque output when driving Fox's low-speed driving. This will not only benefit the vehicle's start-up and acceleration, but also enable early shifting to achieve fuel economy.

There is still a part of the interior of the aluminum cylinder engine using cast iron material, especially the cylinder, and cast iron material is used. The thermal expansion coefficient of cast aluminum and cast iron after combustion of fuel is not uniform, which is commonly referred to as the problem of deformation consistency. This is a problem in the casting process of cast aluminum cylinders. When the engine is working, the cast aluminum cylinder engine equipped with cast iron cylinders must meet the sealing requirements. How to solve this problem is a matter of particular concern to the cast aluminum cylinder companies.

Manufacturers who are good at promoting products: When promoting their own automotive products, they often use the "all-aluminum engine" as the "glare" aura. In view of this, we see that both the Audi A8, Fox, and Swift have locked their engine's bright spots on the aluminum cylinder. It is undeniable that the aluminum engine is indeed superior to cast iron engines in terms of material, heat dissipation and so on. Disadvantages of aluminum: The first is the volume. Due to the light weight of aluminum, the structural strength per unit volume of aluminum is smaller than that of cast iron, so the volume of the aluminum cylinder is usually larger than that of cast iron, and it is difficult to achieve compactness and small volume of the cast iron cylinder. Followed by corrosion resistance and strength. As we all know, aluminum is easy to chemically react with the water produced during combustion. Therefore, the corrosion resistance is far inferior to that of a cast iron cylinder. This is especially true for booster engines that require higher temperature and pressure. In addition to the already stated volume-related conclusions, it is very difficult to achieve the strength of a cast iron cylinder using an aluminum cylinder when the vehicle's engine volume requirement is small. Therefore, most high-pressure engines use cast iron cylinders. In these two respects, the aluminum engine is obviously inferior to the cast iron engine. Again, the coefficient of friction of the engine. In today's car engines, in order to reduce the inertia of components that reciprocate, they usually increase the speed and response speed. The pistons also mostly use aluminum alloys as materials. If the cylinder wall is made of aluminum. The friction coefficient between aluminum and aluminum is relatively large. For this reason, the performance of the engine will be greatly affected. On the contrary, the cast iron engine will not cause such problems. Therefore, in this respect, the cast iron cylinder body is also superior to the all-aluminum engine. Cylinder head is the advantage of aluminum alloy: It should be noted that the all-aluminum engine that the enterprise often says is that the cylinder head and the cylinder block are all made of aluminum alloy. The cylinder head is an aluminum alloy and the cylinder block is a cast iron engine, still called a cast iron engine. In fact, as early as many years ago, the automaker's engine had already adopted the aluminum cylinder head on a large scale. Because the weight of the cylinder head itself is not large, the car manufacturer is not keen on it because of its light weight, but because of its good heat dissipation performance. With the rapid development of engine technology, the four-valve structure has become the mainstream design trend of the engine. Compared with two-valve engines, the cylinder heads of four valves per cylinder generate more heat than the cylinder heads of two valves per cylinder. Therefore, the use of an all-aluminum cylinder head is the best solution. For cost reasons, the design of the cylinder block with aluminum is much later than the cylinder head. The cylinder block is the heaviest part of the engine, so the use of aluminum alloy material can reduce the weight of the engine, so as to reduce the weight of the vehicle. This is particularly valuable for the pre-precursor cars. However, as everyone knows, the change of material requires more cost. Due to the difference in material price and processing technology, the engine using aluminum alloy cylinder will naturally be higher than the price of cast iron engine. At this point of appeal, the apparently cast iron engine dominates.