Had a simple question, does a car engine always deliver constant power? (Product of Torque and rpm is always same)?

Nope. At low to medium RPM's, the torque is limited by the amount of pressure the cylinders can develop. There's only so many PSI you can get from a cylinder full of burnt gasoline.

So since the torque is flat, the power goes down proportional to the RPM going down.At quite high RPM's torque heads down again, as the gas does not have enough time to expand before being exhausted. So even though RPM is going up, torque is going down even faster so the horsepower goes down after a certain point. There's an optimum RPM where the horsepower peaks.

It's usually a ways above the point of peak torque. Ancient_Hacker 62 months ago.

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