1. The problem statement, all variables and given/known data Why does an IC engine generate about the same maximum torque over a range of engine speeds but the maximum power at only one speed? 2. Relevant equations None. 3. The attempt at a solution For max power, the best I can come up with is that since torque does not drop as fast as rpm is increasing, max power occurs after peak torque. As for why max torque can occur over a range of engine rpm, I have no clue.