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How to Calculate 3.5 Peak HP

Determining the peak amount of horsepower produced by a 3.5-horsepower engine requires performing a simple calculation. To do this, you must obtain specific variables including the rpm output and torque output of the engine. A constant is then used in the equation, which is obtained when the number 33,000 is divided by (2/Pi). This results in 5,252 which is used to represent 1 horsepower.

Instructions

- 1
  Determine the maximum rpm of the engine -- for example, 14,000. Make a note of the torque output, such as 1.7 ft/lbs. Note the rpm obtained when the torque is reached, such as 10,000.
- 2
  Write out the equation for determining the total horsepower of the engine. This equation is expressed as ̶0;HP = rpm x torque/5252.̶1;
- 3
  Input the rpm obtained when the torque is reached into the equation. Also input the torque output into your equation.
- 4
  Solve the equation, to find that the peak amount of horsepower obtained by the engine is 3.24 -- based on the example figures. Repeat this process to find the peak horsepower of another 3.5-horsepower engine with a different rpm and torque.

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