What is the function of an engine?

The engine is an energy conversion device, the role of the thermal energy of gasoline (diesel) through the expansion of gas after combustion in the sealed cylinder, pushing the piston to work, into mechanical energy. Machines that can convert other forms of energy into mechanical energy include, for example, internal combustion engines, external combustion engines, and electric motors. For example, internal combustion engines usually convert chemical energy into mechanical energy. Engine applies to both the power generating device and can refer to the entire machine including the power unit.

One of the most common engine parameters - engine displacement. Engine displacement is the sum of the working volume of each cylinder of the engine, generally expressed in liters (L). The cylinder working volume, on the other hand, is the volume of gas swept by the piston from the top stop to the bottom stop, also known as single-cylinder displacement, which depends on the cylinder bore and piston stroke. Engine displacement is a very important engine parameter, it is more representative of the size of the engine than the cylinder bore and cylinder number, many indicators of the engine are closely related to the exhaust volume. Generally speaking, the larger the displacement, the greater the engine output. Understand the displacement, and then look at the other common parameters of the engine. Many junior car enthusiasts have reflected often in the car information in the engine column to see "L4", "V6", "V8", "W12 "V6", "V8", "W12" and other words, trying to understand what it means. These indicate the arrangement of engine cylinders and the number of cylinders. The number of cylinders commonly used in automobile engines are 3, 4, 6, 8, 10, 12 and so on.

References:

Engine_Baidu Encyclopedia