What is the firing order of a 4-cylinder engine?

[DominicMarie]

4-cylinder engines have two possible firing orders: 1-2-4-3 or 1-3-4-2, which depends on factors such as crankshaft structure. The working cycle of a four-stroke gasoline engine consists of four piston strokes: intake stroke, compression stroke, power stroke, and exhaust stroke. A 4-cylinder engine, also known as a 4-cylinder power unit, is a machine that converts one form of energy into another more useful form of energy. Its main components include the cylinder block, crankcase, cylinder head, and cylinder gasket. The basic principle of a 4-cylinder engine is to convert the thermal energy of gasoline (or diesel) into mechanical energy by pushing the piston to do work through gas expansion during combustion in the sealed cylinder.