In terms of engine materials, people usually talk about the main materials of the cylinder block and cylinder head. For example, the oft-mentioned all-aluminum engine means that the cylinder block and cylinder head are cast from aluminum alloy. Most "all-aluminum" engines also use cast iron cylinder liners.
1) Weight The density of aluminum is lighter than that of cast iron. In order to meet strength requirements, the aluminum cylinder body is much lighter. A lighter engine can have a positive impact on the weight distribution of the entire vehicle, making the entire vehicle lighter. This is why the aluminum cylinder is dominant in this regard.
2) Volume For the same reason, the density of aluminum is light, and the structural strength of aluminum per unit volume is lower than that of cast iron, so the aluminum cylinder Eastgenerally larger in volume. The cylinder diameter of the existing version can reach 80mm, and the cylinder wall is actually quite thin except for the cooling water channel. This way the whole engine is compact and small in size. It is more difficult for aluminum cylinders to achieve this effect. In this regard, the cast iron cylinder block is advantageous.
3) Corrosion resistance and strength
Aluminum reacts easily with water produced during combustion, and its corrosion resistance is not as good as that of the cast iron cylinder, especially when the temperature and pressure are higher. This is especially true for engines. And the previous conclusion regarding volume, conversely, when your engine's volume requirements are relatively small, it is generally difficult to use an aluminum cylinder to achieve the strength of a cast iron cylinder. Therefore,Many supercharged engines use cast iron cylinder blocks. It is basically not easy to use aluminum cylinder blocks. In this regard, the cast iron cylinder block is advantageous.
5) Explosion-proof aluminum conducts heat faster, so it has good cooling performance, which can help the engine reduce the probability of abnormal combustion. With the same compression ratio, aluminum cylinder engines can be used better than. cast iron cylinder engines. Low quality gasoline. In this regard, the aluminum cylinder block is dominant.
6) Coefficient of friction
In current engines, in order to reduce the inertia of reciprocating components and increase the speed and response speed, most pistons use aluminum alloy as material. If the cylinder wall is also made of aluminum. The coefficient of friction between aluminum and aluminum is rerelatively large, which greatly affects engine performance. Cast iron does not have this problem. At this point, the cast iron cylinder block is dominant.
Is iron or aluminum better for domestic car cylinders
In the era of life, the use of bathtubs is becoming more and more common, so which bathtub material is best? Woolen fabric? Let's take a look at the characteristics of each material. 1. Acrylic bathtubs are made from artificial organic materials. They are characterized by rich shapes, light weight, good surface finish and low prices. poor pressure resistance of artificial organic materials, not wear-resistant, and the surface is easy to age. Therefore, the surface of the acrylic bathtub rarely changes color after being used for more than three years. The advantages are that it is cheap and has agood thermal insulation. The downside is that it's easy to change color. Another disadvantage is that it is easy to attach dirt and difficult to clean. It makes a lot of noise when draining water. 2. Bathtub made of steel sheet, the traditional material for making bathtubs. The steel sheet bathtub is made of a special steel plate for bathtubs with a thickness of about 2mm, which is stamped and formed, and the surface is treated with enamel. wear-resistant, heat and pressure resistant and other characteristics, the weight is between the cast iron cylinder and the acrylic cylinder, and the heat insulation effect is lower than that of the cast iron cylinder , but long life and high overall performance. This type of cylinder has an enamel surface, which is neither hydrophilic nor oil-free, so the surface finish and hardness are very high, extremely wear-resistantand scratches, and it is not easy to adhere to dirt and is very easy to clean. The price is in the middle, not easy to dirty, easy to clean, not easy to fade, and has lasting luster. But the insulation is not good. The noise is moderate when the water escapes. 3. Cast iron cylinders are made of cast iron and coated with enamel, so they are very heavy and less likely to produce noise when used. Because the casting process is complicated, cast iron cylinders usually have a unique shape and are very expensive. Because the cast iron cylinder is heavy and difficult to move and transport, the installation process is very tedious and often requires lifting. It is also difficult to move and repair after installation, so ordinary consumers buy less. However, due to the thick wall of the cast iron cylinder, its outstanding feature is good thermal insulation performance.mic. Not easy to hang dirt, easy to clean, good thermal insulation but the price is the highest. There is little noise when draining water. After talking about so many types of materials, I hope you have made your own choice, I hope it is useful to you, and I wish you a happy life.
What are the advantages of cast iron cylinder block
In terms of engine materials, people usually talk about the main materials of the cylinder block and cylinder head, e.g. often mentioned. All-aluminum engine refers to the cylinder block and cylinder head are both cast from aluminum alloy. Most "all-aluminum" engines also use cast iron cylinder liners.
Weight: The density of aluminum is lighter than that of cast iron. In order to meet strength requirements, the aluminum cylinder body is much lighter. A lighter engineger can have a positive impact on the weight distribution of the entire vehicle, thereby making the entire vehicle lighter. This is why the aluminum cylinder is dominant in this regard.
For the same reason as volume, the density of aluminum is light, and the structural strength of aluminum per unit volume is lower than that of cast iron, so the aluminum cylinder is generally larger in volume. The cylinder diameter of the existing version can reach 80mm, and the cylinder wall is actually quite thin except for the cooling water channel. This way the whole engine is compact and small in size. It is more difficult for aluminum cylinders to achieve this effect. In this regard, the cast iron cylinder block is advantageous.
Corrosion resistance and strength Aluminum reacts easily with water produced during combustion, and its corrosion resistance is not as goodthan that of cast iron cylinders, especially for supercharged engines with higher temperatures and pressures. And the previous conclusion regarding volume, conversely, when your engine's volume requirements are relatively small, it is generally difficult to use an aluminum cylinder to achieve the strength of a cast iron cylinder. Therefore, many supercharged engines use cast iron cylinder blocks. It is basically not easy to use aluminum cylinder blocks. In this regard, the cast iron cylinder block is advantageous.
Explosion-proof aluminum conducts heat faster, giving it good cooling performance, which can help the engine reduce the probability of abnormal combustion. With the same compression ratio, an aluminum cylinder engine can use lower pressure than an aluminum cylinder engine. a fon cylinder engineyou. In this regard, the aluminum cylinder block is dominant.
Friction coefficient In current engines, in order to reduce the inertia of reciprocating components and increase the speed and response speed, aluminum alloy is mainly used as the material for pistons . If the cylinder wall is also made of aluminum. The friction coefficient between aluminum and aluminum is relatively large, which greatly affects the performance of the engine. Cast iron does not have this problem. At this point, the cast iron cylinder block is dominant.
Which is better, cast iron or aluminum alloy for the engine?
What are the advantages of cast iron cylinder block?
The heat carrying capacity of cast iron cylinder block is stronger, and cast iron has greater potential to increase engine power.
First of all, for example, the power output of a 1.3 liter cast iron engine can exceed 70 kW. If a cast aluminum motor is used, the maximum output power of the motor can only reach 60 kW. It can be seen from the performance of these two motors that the cast iron motor has a stronger load capacity.
If a 1.5 liter cast iron engine is used, the engine can meet the power requirements of the 2.0 liter engine through supercharging technology.
Many high-performance models still use cast iron engines. However, due to the poor heat dissipation performance of cast iron engines, vehicles need to be equipped with better water and air cooling systems, especially some models using a turbocharger. engines, which have a negative impact on cooling. The system requirements are very high.
First let's talk about the cast iron engine used in the 9th generation of EVO. This engine is quite heavy and has slightly mediocre cooling performance.cres. However, this engine has excellent performance in resistance to high temperatures and pressures. This engine has a maximum power of 500 horsepower and a torque of more than 600 Nm. Naturally, this engine has advantages and disadvantages.
Okay, thank you very much for taking the time out of your busy schedule to read the editor's article. Here are the advantages of cast iron cylinder blocks presented by the editor. () Due to the limited level, the editor must have defects. Please point that out as well. The editor will improve.
Automotive engine block materials, aluminum alloy and cast iron, have their own advantages and disadvantages.
In the past, engine cylinder blocks were made of cast iron, because cast iron parts have good corrosion resistance and anti-rust capabilities, as well as good weather resistance. wear, and the cylinder block has good resistance,has the advantages of being resistant to pressure and not easily deformed, so many large engines still use cast iron cylinder blocks, and they have been used to this day.
The advantages of aluminum alloy cylinders are lower weight and better heat dissipation efficiency. Reducing vehicle weight equals saving fuel, so more and more small vehicles use aluminum alloy cylinders. However, the aluminum alloy cylinder block has insufficient wear resistance, and a cylinder liner must be installed to extend the life of the engine. The cost of aluminum alloy cylinder block is also higher than that of cast iron. Since aluminum alloy is not very strong, it is rarely used in large diesel engines.
Cylinder cooling method
In order to ensure that the surfIn order for the cylinder to operate normally at high temperatures, the cylinder and cylinder head must be cooled at all times. . There are two cooling methods: one uses coolant to cool (water cooling); the other uses air to cool (air cooling).
Water cooling is often used in automobile engines. When the engine is cooled with water, coolant-filled cavities form around the cylinder and in the cylinder head, called water jackets. The water jackets on the cylinder block and the cylinder head are connected together. When the engine is air-cooled, many heat sinks are molded on the outer surface of the cylinder block and cylinder head to increase the heat dissipation area and ensure sufficient heat dissipation. Generally, the cylinder block and crankcase air-cooled engineswere sunk separately.