Posted by PopinJohn on October 21, 2009 at 17:10:47 from (207.119.235.26):
In Reply to: Torque Chart Reply posted by GUIDO on October 21, 2009 at 06:48:24:
Hi Guido, I agree, 5252.1 is the constant used in the formula. The formula you present is correct.
But, a constant has to be rooted in math. 5252.1 is equal to 33,000 ft/lbs. divided by 6.2832. [6.2832 is (pi 3.1416) multiplied by 2].
That's why I was pointing out that "because of the formula, 5252.1 RPM is the point where a torque curve and and horsepower curve always cross on a engine spec sheet".
As an example, HOT ROD magazine publishes dyno result charts with both the HP curve and the Torque curve. These are high output racing engines with the capability to turn on up to 6000 RPM or more. The curves always show HP and Torque to be equal at 5252 RPM.
Try it this way: Find Torque = 39Hp x constant 5252 divided by 5252 RPM. The constant and the RPM cancel each other therefore Torque = 39, same as the horsepower.
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