Q

How is engine torque measured?

The measurement of engine torque is based on two core physical principles. The first is the moment principle, which calculates torque as the product of the force acting perpendicularly on the arm and the length of the arm, with the formula: Torque = Force (N) × Length of force arm (m). This principle is suitable for quantifying the torque of mechanical components such as drive shafts and gear sets. The second is the dynamic performance correlation method, which derives torque using the relationship between the engine's output power and rotational speed, with the formula: Torque (N·m) = Power (kW) × 9550 ÷ Rotational speed (rpm). This method is often used for evaluating the overall torque of the engine. These calculation methods are widely applied in the automotive field. During the design phase, they can optimize the parameter matching between the engine and the transmission system, balancing dynamic performance and fuel economy. In performance testing, the torque curve can intuitively reflect the engine's dynamic characteristics at different rotational speeds. In the manufacturing process, component assembly must be carried out in accordance with torque requirements to ensure the reliability and stability of connections, and to avoid component loosening or damage caused by improper torque.
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