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# ENGINE PULLEY DIAMETERS AND RATIOS How to Calculate the Speed of Two Different Pulleys
Apr 24, 2018Calculate the pulley ratio by dividing the pulley's pitch diameter by the pitch diameter of the drive pulley. For example, suppose the drive-shaft has a diameter of 2.2 inches, and two pulleys driven by the belt have diameters of 4.4 inches and 2.8 inches. The first ratio = 4.4/2.2 = 2, and the second ratio = 2.8/2.2 = 1.
How to Calculate the Pulley & Belt Ratio | Our Pastimes
Measure the diameter of the load pulley, and write it down. Divide the drive pulley diameter by the load pulley diameter. The result will be the pulley and belt ratio. For example: a 2-inch drive pulley and a 4-inch load pulley yields a pulley and belt ratio of 1/2.
Pulley and RPM Calculator | Engineering Information
To determine the input or output speed or the pulley and cog sizes needed in a drive you may use a simple ratio. Given any three items you can solve for the fourth. With a V-Belt drive the answer is theoretical, due to belt slippage, and with a timing belt or a chain drive not every answer provided is an available combination.
Pulley size and RPM
This is an on-line calculator for pulley size and revolutions per minute (RPM).
Question about crank pulley size and overheating | Chevy
Feb 26, 2007If the pump pulley is 6" in diameter and the crank pulley is 6.5" in diameter, the pump is technically being overdriven as it is rotating faster than the engine. Compared to the original configuration of an 8" crank pulley, the pump is rotating about 80% as fast. What do you mean by ratio?
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