What Causes the Engine Abnormal Noise in BMW 523li?
1 Answers
Inappropriate engine oil, especially with excessively high viscosity, can lead to insufficient lubrication of the engine, resulting in friction-induced abnormal noise. Engine Classification: External combustion engines, meaning their fuel burns outside the engine, were invented in 1816 by R. Stirling of Scotland, hence also known as Stirling engines. These engines convert the thermal energy generated from combustion into kinetic energy. The steam engine improved by Watt is a typical example of an external combustion engine. When a large amount of coal burns to generate heat, it heats water into a significant volume of steam, creating high pressure. This high pressure then drives mechanical work, completing the conversion of thermal energy into kinetic energy. Internal combustion engines, or reciprocating piston engines, differ significantly from external combustion engines in that their fuel burns inside them. There is a wide variety of internal combustion engines, with common gasoline and diesel engines being typical examples. Engine Displacement: Engine displacement is the total volume swept by all the cylinders in an engine, usually measured in liters (L). The cylinder displacement refers to the volume of gas swept by the piston from the top dead center to the bottom dead center, also known as single-cylinder displacement, which depends on the cylinder bore and piston stroke. Engine displacement is a crucial parameter, more representative of engine size than cylinder bore and number, and many engine indicators are closely related to displacement. Generally, the larger the displacement, the greater the engine's output power.
