Horsepower and Torque
Hello, Guys, I will talk about horsepower and torque when it comes to engines of all kind. Today I will try to explain what is Horsepower and Torque.
The term horsepower was invented by the engineer James Watt. It defines how fast the engine can get the work done or apply torque to the load. 1HP= 750 watts.
One horsepower is equal to 33,000 foot-pounds in one minute. This means that a horse exerting 1 horsepower can raise 330 pounds of coal 100 feet in a minute, or 33 pounds of coal 1,000 feet in one minute, or 1,000 pounds 33 feet in one minute.
It is derived by the Formula:
HP = Torque x RPM / 5252
It is the measure of how much twisting force and engine crankshaft can produce. The more torque an engine produces, the greater its ability to perform work.
Engine torque output will vary on how fast the engine is spinning or the RPM. You can see it in the image that as the RPM changes the torque is varying.
More amount of torque is generated in a diesel engine than a petrol engine.
The higher turbo boost pressure, high compression ratio, and greater heat content of the fuel all add to the generation of cylinder pressure that is substantially higher than in gasoline engines too, but it is this continued injection of fuel that really makes the big torque numbers for diesel.
It is calculated T = r*f*sinθ
Courtesy Engineering Explained