What do L3 and L4 mean in cars?

[McSebastian]

Engine L3 refers to an inline 3-cylinder engine, while L4 refers to an inline 4-cylinder engine. Here is the relevant information: 1. Inline Engine (Line Engine): All its cylinders are arranged side by side in a single plane. Its cylinder block and crankshaft structure are simple, and it uses a single cylinder head, resulting in lower manufacturing costs, high stability, good low-speed torque characteristics, low fuel consumption, and compact size, making it widely used. The disadvantage is lower power output. "Inline" can be represented by the letter L, followed by the number of cylinders to form the engine code. Modern cars mainly feature L3, L4, L5, and L6 type engines. 2. Engine: An engine (Engine) is a machine that converts other forms of energy into mechanical energy, including internal combustion engines (such as gasoline engines), external combustion engines (such as Stirling engines, steam engines), and electric motors. For example, an internal combustion engine typically converts chemical energy into mechanical energy. The term engine can refer to both the power-generating device and the entire machine including the power unit (e.g., gasoline engine, aircraft engine).