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Why is torque and horsepower the same at 5252 rpm?
One horsepower is equal to 33,000 foot-pounds of work per minute. Add in the equations relating to torque and velocity, and you’ll find that horsepower always equals torque multiplied by rpm, divided by 5,252. Canceling out the equal variables, you wind up with horsepower equaling torque… at 5,252 rpm.
At what rpm does horsepower and torque meet?
around 5252 RPM
If you look at a lot of dyno charts, you’ll notice that horsepower and torque always seem to cross around 5252 RPM.
Why does engine torque change with rpm?
At high RPM, torque drops off primarily from intake and exhaust flow restriction. Volumetric Efficiency declines because the engine can’t breathe any faster. Mechanical efficiency also declines at higher RPM, due to increased frictional resistance. This further reduces torque at the output.
Where is HP 5252 from?
The number 5,252 is the result of lumping several different conversion factors together into one number. First, 1 horsepower is defined as 550 foot-pounds per second (read How Horsepower Works to find out how they got that number). The units of torque are pound-feet.
Does torque equal speed?
Torque is inversely proportional to speed. Thus, when speed increases, torque will decrease.
Why does horsepower and torque always seem to cross at 5252 rpm?
If you look at a lot of dyno charts, you’ll notice that horsepower and torque always seem to cross around 5252 RPM. Seriously. Just search Google Images for dyno charts and you’ll be blown away by how often this is the case.
How are power, torque, and velocity related?
There, we’re going to learn about power, torque, and velocity. You see, power is equal to force times any velocity. Velocity is understood to be a given distance divided by the time needed to cover that distance. Finally, torque is the figure generated by a force multiplied over a given radius value.
How did James Watt come up with the idea of horsepower?
James Watt, a Scottish engineer who developed the concept of horsepower, figured out that one metric horsepower is needed to lift 75 kilograms by one meter in one second. It’s related to how much work a horse will do related to the same work done by a steam engine.