Q: As a lifetime reader of HOT ROD, Car Craft, and many other automotive magazines, I have noticed that engine horsepower and torque always reach a crossover point where the two are nearly identical. This occurs between 5,000 and 5,300 rpm, and it does not matter whether the build is stock or all-out race, or who manufactured or built the engine. Since every engine has far different variables, why is this rpm range the “sweet spot” for horsepower and torque to most closely match?
A: Not “nearly identical”—always identical—at 5, 252 rpm. It has to do with the symbiotic mathematical relationships between power, torque, work, time, force, and distance. The math is universal, constant, and unchanging—and it applies to all conventional engines and motors that produce measurable torque around…