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Engine materials, usually people often talk about the main cylinder block and cylinder head of the material, such as often said all aluminum engine, that is, the cylinder block and cylinder head are cast in aluminum alloy. Most "all aluminum" engines also use cast iron liners.

1.

The weight of aluminum is lighter than cast iron, and the aluminum cylinder block is much lighter to meet the strength requirements. With a lighter engine, you can have a positive impact on the weight distribution of the vehicle, and the vehicle is lighter. Therefore, this point on the aluminum cylinder block dominance.

2.

Volume for the same reason, the specific gravity of aluminum is light, the structural strength of aluminum per unit volume is less than cast iron, so the volume of aluminum cylinder block is usually larger. Only some versions of the cylinder diameter can be up to 80mm, except for the cooling water channel is actually quite thin cylinder wall. As a result, the engine is compact and small. Aluminum blocks are harder to achieve. On this point the cast iron cylinder block dominates.

3.

Corrosion resistance and strength

Aluminum tends to chemically interact with water when burned and is less resistant to corrosion than cast-iron blocks, especially for supercharged engines with higher temperatures and pressures. On the other hand, when you have a small engine size, aluminum blocks are usually not as strong as cast iron blocks. So a lot of high supercharged engines use cast iron block, if you use aluminum block, basically not too easy. On this point the cast iron cylinder block dominates.

4.

Explosion-resistant aluminum conducts heat faster, so it has better cooling performance, which helps reduce the chance of abnormal combustion. Aluminum engines can use lower grades of gasoline than cast-iron engines for the same compression ratio. At this point, the aluminum cylinder block dominates.

5.

The coefficient of friction

In order to reduce the inertia of the reciproing parts and improve the speed and response speed of the current engines, the piston is mostly made of aluminum alloy. If the cylinder walls are also aluminum. The coefficient of friction between aluminum and aluminum is relatively high, so engine performance is greatly affected. Cast iron has no such problem. At this point, the cast iron cylinder block dominates.

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