What are the materials of the engine block?
At present, the cylinder block materials of gasoline engines are mainly divided into two types: cast iron and aluminum alloy. In diesel engines, cast iron cylinder blocks account for the vast majority.
The advantages of aluminum alloy cylinders are light weight and good thermal conductivity. However, although it is called an aluminum alloy cylinder block, the cylinder part still uses a cast iron cylinder liner or a coating of alloy steel to ensure the wear resistance and strength of the cylinder part.
The advantages of the cast iron cylinder block are high corrosion resistance and strong thermal load capacity, but for the engines used in ordinary civilian cars, the aluminum alloy cylinder block has become the general trend. In addition, some manufacturers will use magnesium alloy and aluminum alloy to form a composite cylinder block of aluminum-magnesium alloy, which reduces the quality of the engine to a certain extent, and finally achieves the purpose of improving fuel economy.
What is the engine bore?
On the engine, the piston reciprocates linearly in the cylinder, and the diameter of the cylinder is referred to as the cylinder diameter.
Without considering other factors, simply looking at the size of the cylinder bore and stroke, we can get: under the premise of the same displacement, the design of "small cylinder bore × long stroke" will make the peak torque appear at a lower speed , suitable for low- and medium-speed engines, and the power output is strong when starting and accelerating.
On the contrary, the engine designed with "large bore x short stroke" is more suitable for high-speed engines because each stroke of the piston is shorter, and higher limit speed is its specialty, and if you want to start and accelerate quickly, just It can only be achieved by increasing the speed of the engine.
