Can a Three-Cylinder Engine Be Replaced with a Four-Cylinder Engine?

[McEmmanuel]

Replacing a three-cylinder engine with a four-cylinder engine privately is not allowed; it can only be done after filing with the vehicle management office. Below are the differences between three-cylinder and four-cylinder engines: Stability Differences: In terms of stability, the four-cylinder engine is significantly better than the three-cylinder engine. This is because the four-cylinder engine operates in separate strokes, allowing the forces and counterforces to cancel each other out, greatly reducing engine vibration. The three-cylinder engine lacks one cylinder, meaning there is a moment during operation when the engine is not in a working state. As a result, the vibration of the three-cylinder engine is more noticeable, making its stability naturally inferior to that of four-cylinder, six-cylinder, and eight-cylinder engines. Structural Differences: The three-cylinder engine has a simple structure, compact size, lightweight, and is easier to arrange. The four-cylinder engine has a relatively more complex structure with one additional cylinder. In terms of structural design, the three-cylinder engine has one fewer cylinder than the four-cylinder engine, and correspondingly, fewer camshaft attachments.