http://www.zhome.com/ZCMnL/tech/torqueHP.htm That guy explained it pretty good on why the magic number is 5252.
Originally posted by warmonger:
The lines cross at 5250 because the HP and Torque are related to each other by the factor of (rpm/5250). Whenever rpm=5250 this factor =1 and then HP and Torque are equal.
warmonger