Why does an engine typically achieve peak brake power at higher RPM than peak torque?

An engine typically achieves peak brake power at higher RPM than peak torque primarily because more power strokes per second occur at these elevated engine speeds.

At higher RPMs, the engine cycles through its power strokes more frequently within the same time frame. Each power stroke contributes to the overall power output, and since power is essentially the product of torque and engine speed (RPM), having more strokes per minute directly translates to increased power output. The relationship between torque and RPM is crucial in understanding engine performance; torque provides the twisting force needed to move the vehicle, while RPM indicates how quickly the engine is operating.

In contrast, peak torque often occurs at lower RPMs where the engine is able to generate maximum rotational force. While torque is important for acceleration and pulling heavy loads, power, measured in horsepower, encompasses both torque and RPM. Hence, as RPM rises, the power aspect increases more dramatically than torque until it reaches a mutual high point, or peak power.

Higher RPMs also allow the engine to take advantage of its design, where various factors like airflow and fuel delivery optimize performance, contributing further to achieving peak power in this region of operation.