What is the primary cause of lugging in an engine?

Lugging occurs when an engine is operating under excessive load at low RPM, preventing it from reaching its optimal power output. This is primarily caused when the engine is placed in a gear that is too high for the current driving conditions. In high gear, the engine has to work harder to move the vehicle, which can result in a lack of power, stalling, or rough running as it struggles to maintain speed.

In this situation, the engine may not be able to provide sufficient torque, leading to inefficient combustion and potential damage over time. Proper gearing allows the engine to operate within its optimal RPM range, ensuring that it can deliver power effectively without unnecessary strain. Understanding the relationship between gear selection and engine performance is crucial for maintaining engine health and performance.