Q:

What is the relationship between rpm, torque and horsepower?

A:

Quick Answer

The horsepower of an engine is equal to the torque multiplied by the rpm and divided by 5,252. This is because power is equal to force times distance divided by time, and 1 horsepower is equal to 33,000 foot-pounds of work per minute.

Continue Reading

Keep Learning

Full Answer

Since torque is equal to force multiplied by radius, and the distance per minute of an engine's work is equal to the radius times two multiplied by pi and multiplied yet again by the rpm, the power of an engine's work is equal to the force times the distance per minute. Upon dividing both sides by 33,000 to arrive at the horsepower of the engine's output, the number 5,252 appears as a scalar variable that unites the relative values of the units.

As an example of the results that these equations imply, a single horsepower engine spinning at 3,450 rpm produces 18 pound-feet of torque, while the same engine spinning at 500 rpm produces 189 pound-feet of torque. A 10-horsepower engine spinning at 3,450 rpm produces 183 pound-feet of torque, while the same power at 500 rpm produces 1260 pound-feet of torque. One hundred horsepower produced by an engine spinning at 3,450 rpm produces 1,827 pound-feed of torque, and a 600-horsepower engine spinning at 500 rpm produces 75,629 pound-feet of torque.

Learn more about Engine
Sources:

Related Questions

• A: There is a relationship between engine size and horsepower, as they are both measurements to the power generated by the engine. However, engine size, which... Full Answer >
Filed Under:
• A: Suitable for street and off-road use, the 454 HO big block crate engine by Chevrolet is able to produce 425 horsepower at 5250 rpm. As of 2015, Chevrolet s... Full Answer >
Filed Under:
• A: The B18C1 is a 1.8 liter, 16 valve dual overhead cam VTEC engine designed by Honda Motor Company and outputs 170 horsepower and 128 foot pounds of torque. ... Full Answer >
Filed Under:
• A: The LS2 engine's specifications include being able to generate up to 400 brake horsepower at an engine speed of 6,000 rotations per minute and 400 pounds f... Full Answer >
Filed Under:
PEOPLE SEARCH FOR