Of a combustion engine, the speed, torque, and power is measured at the crankshaft. For a measured pair of values for speed $N$ and torque $M$, can there be more than one value for power $P$? In other words, is the power defined by the torque and speed?
There are opinions trying to convince me that it depends on the engine's mode of operation, which depends on various factors such as internal temperatures and pressures. Such changes between modes of operation are intended to prolong the engine's life and/or reduce fuel consumption.
I know, this kind of question again... But please, I am trying to fight an "argument from authority" here and nothing really answers my question with regards to combustion engines.