What is the relationship between engine speed and torque?

[RobertRose]

Power P = Torque × Angular velocity ω. The formula shows that under fixed power conditions, torque is inversely proportional to engine speed. The faster the speed, the smaller the torque, and vice versa. Below is relevant information: 1. Speed: In an engine, speed refers to the number of revolutions the crankshaft makes per unit of time and is directly related to vehicle speed. When the gear remains unchanged, an increase in engine speed leads to a corresponding increase in vehicle speed. The speed is reduced and the torque is increased through the entire transmission system, including the gearbox and final drive, and is ultimately reflected in the wheels. Therefore, the ratio of engine speed to wheel speed is the transmission ratio of the entire drivetrain. 2. Torque: Torque is the force that causes an object to rotate. Engine torque refers to the moment output from the crankshaft end. Under fixed power conditions, it is inversely proportional to engine speed—the faster the speed, the smaller the torque, and vice versa. It reflects the vehicle's load capacity within a certain range.