The engine is the core component of the car, just like the heart of the car, and the engine is also different in production. There are two types of car engines on the market today, all aluminum engines and cast iron engines, but what do they have What's different? So, what's the difference between an all-aluminum engine and a cast-iron engine? Which of these two engines is better? Let's take a look together.
What is the difference between an aluminum engine and a cast iron engine
Benefits of an all-aluminum engine
The all-aluminum engine refers to the engine whose cylinder head and cylinder block are made of aluminum alloy. The cylinder head is made of aluminum alloy, and the cylinder is made of cast iron. It is still called a cast iron engine. Because the weight of the cylinder head itself is not heavy, car manufacturers are not interested in it because of its light weight, but because of its light weight. Has good heat dissipation performance. Here, we can also know that the all-aluminum engine is indeed superior to the cast-iron engine in terms of material and heat dissipation. Advanced models use all-aluminum engines for the purpose of weight reduction. The cast aluminum cylinder is relatively light, and it saves fuel by reducing weight. In the same displacement engine, the use of aluminum cylinder engine can reduce the weight of about 20 kilograms. You must know that for every 10% reduction in the vehicle's own weight, the fuel consumption can be reduced by 6% ~ 8%.
Because the specific gravity of aluminum is lighter, the unit strength of aluminum is less than that of cast iron. Therefore, the volume of aluminum cylinders is usually larger than that of cast irons. It is difficult to achieve the compactness and small volume of cast iron cylinders. However, Aluminum is susceptible to chemical reactions with water generated during combustion. Therefore, corrosion resistance is far less than that of cast iron cylinders, especially for supercharged engines that require higher temperature and pressure. At the same time, because of the volume, when the volume of the engine of the car is small, it is difficult to achieve the strength of the cast iron cylinder with the aluminum cylinder block.
Benefits of cast iron engines
Compared with all-aluminum engines, cast-iron engines have stronger hardness and can withstand larger loads. Therefore, most heavy-duty diesel engines and turbocharged engines use cast-iron engines. Although cast-iron engines have less thermal deformation, they are more conducive to automobile manufacturing engines. However, due to the relatively high material cost and manufacturing cost, fewer and fewer car companies use cast iron engines. In fact, the secondary plasticity of cast iron engines is better. Even if uneven wear occurs in the cylinders of cast iron engines, they can be re-used at a later stage. Grinding is used, and the aluminum alloy engine is basically a disposable engine, which is difficult to use for secondary processing.
Which is better, all aluminum engine or cast iron engine
If you attach great importance to the strength of the engine, then from the perspective of strength, the high temperature and high pressure resistance of the cast iron engine is much stronger than the all-aluminum engine. All-aluminum engines are also prone to chemical reactions with water at high temperatures. Therefore, cast iron engines are the only choice for many high-pressure supercharged engines. If you do n’t value the strength and only need a home, then the all-aluminum engine is more suitable for home use. Good cooling performance can reduce the probability of abnormal combustion. At the same compression ratio, aluminum cylinders can use lower grade gasoline than cast iron cylinders.
If you are more concerned about engine maintenance, it is recommended that you choose a cast iron engine, because once an aluminum engine has a problem such as cylinder explosion or pull cylinder, it is a big problem and the maintenance cost is very expensive; but the cast iron engine is different. The cast iron engine Such a problem is basically difficult to occur, even if it is very easy to change the boring cylinder and the cylinder liner, and it does not cost much.
In fact, there is no better one between aluminum alloy engine and cast iron engine. The two materials only have different characteristics. Current technological developments have addressed the weaknesses of aluminum alloy engines. And when we buy a car, we don't have to worry and worry about which kind of engine is better. After all, this is not the age of engine materials affecting a car, but the comprehensive assembly of cars.
The above is what is the difference between the all-aluminum engine and the cast-iron engine, which is the better related content, I hope to help you!