In Reply to: If HP is a mathematical function of torque and RPM, how is it that torque curves can posted by Rick (NH_D) on February 28, 1999 at 23:56:25
: be modified by changing intakes, exhaust etc.
Since throttle position affects available torque, any modification which affects Quality and Quantity of combustion is going to affect available torque.
Some engines have almost identical torque/hp curves, others reach peak torque at low rpms others high. Others have fairly flat curves etc. Compare the curves of a diesel, aircraft and auto engine. Isn't the most efficient RPM where the torque and hp curves meet?
: Am I missing something?
Yes, I would have to assume this is correct. But Torque is not a constant. Torque is established by the throttle's position. That postion is determined by friction, drag, desired RPMs etc...