Some of mechanical engineering courses I recall since I was an electrical engineer, is that Horsepower is a function of Torque X RPM. Therefore, if torque remained the same and you doubled the speed, HP doubles.
An engine isn"t a pump, however, yet the laws of thermodynamics and energy conservation hold true for any device. The energy you put into a device (such as say HP) is more then you get out (in say HP) since the device IS NOT perfect and has heat and other friction losses. But a machine doesnt create or destroy energy only change its form so X energy in = the sum of energy out PLUS heat/friction losses. ENERGY ISNT CREATED OR DESTROYED IN THE MECHANICAL PROCESS JUST CHANGED IN FORM SUCH AS CONVERTED TO HEAT.
Hope this helps
John T Electrical NOT Mechanical Engineer so no warranty, this may or may not be right or wrong and Im NOT saying if it is or it isn"t, SO DONT ANYONE HAVE A CALF
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