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Difference between cast iron engines and all-aluminum engines

2020-01-06

At present, there are two main types of automobile engines: cast iron engines and all-aluminum engines. So which of these two material engines is the best to use? What is the difference between the two engines? In fact, almost all engine cylinder head materials are made of aluminum, because aluminum cylinder heads have the best heat dissipation performance. The cylinder head of the cast iron engine is actually aluminum alloy, but the cylinder block is cast iron.

Compared to the all-aluminum engine, the cylinder block of the cast-iron engine has a stronger thermal load capacity, which is more conducive to increasing the engine's power. For example, under the effect of turbocharging, a 1.5L displacement cast-iron engine can actually reach a 2.0L displacement power requirement; while an all-aluminum engine cannot meet such a requirement. Currently, only a few high-end cars use an all-aluminum engine.

In addition, all-aluminum engines are prone to chemical reactions with water during work, and their corrosion resistance is far less than that of cast iron cylinders, and the strength of aluminum cylinders is much lower than that of cast iron cylinders. Therefore, basically all turbocharged engines are cast iron blocks. It is worth mentioning that the cast iron cylinder block also has the modification strength that the aluminum body engine does not have.

In contrast, the biggest advantage of all-aluminum engines is that at the same displacement, the weight of all-aluminum engines is about 20kg lighter than that of cast iron engines. In addition, the heat dissipation effect of the all-aluminum engine is much better than that of the cast-iron engine, which can improve the working efficiency of the engine and help extend the service life of the engine.

At present, almost all engine pistons are made of aluminum alloy. If the cylinder wall material is also all aluminum, the coefficient of friction between aluminum and aluminum is much larger, which will affect the performance of the engine. This is why cast iron liners are always embedded in the cylinder body of all-aluminum engines.

In fact, in summary, the all-aluminum engine has the characteristics of easy processing, light weight, and good heat dissipation. The advantages of cast iron engines are reflected in high pressure resistance, high temperature resistance, corrosion resistance, deformation resistance and low cost.