What is the difference between low-speed and high-speed engines?

[VanMaverick]

The differences between low-speed and high-speed engines are as follows: 1. The difference lies in the cylinder bore and piston stroke: High-speed engines have a very short piston stroke, as only a short stroke can achieve high speeds, so their cylinder bore is slightly larger. 2. High-speed engines do not have a large displacement, and part of their power comes from the inertial force formed at high speeds. Low-speed engines have a slightly smaller cylinder bore, and their pistons are longer than those in high-speed engines. Due to the long piston stroke and high compression ratio, the pistons in low-speed engines endure greater pressure, so they need to be made sturdier. Their power source often comes purely from the extremely high compression ratio. 3. Different engine structures: High-speed and low-speed engines differ in their structural design, so the speed points at which these two types of engines achieve maximum power and torque are also different. 4. Power and torque requirements: High-speed engines need to increase their speed to obtain high power and torque, while low-speed engines are the opposite.