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You can make rough estimates of engine performance based on engine specs and math. The torque of an engine depends almost entirely on the displacement and volumetric efficiency. In other words if it takes in 3 liters of air it will produce x amount of torque. Volumetric efficiency of a well designed engine will be around 100percent over a small range of RPM and 80-90 percent over the power band. They can even get better than 100 percent with proper intake and exhaust tuning.
Power is just torque times RPM. An F-1 engine is 2.4 liters and probably makes under 200 ft lbs of torque. With a large portion of this torque available at 19000 RPM you get something like 700 HP.
This is how you can often tell if someone is lying about the power they can make. An SC motor makes around 200 HP with CIS at 5800 or so. With carbs it can make 240 or so but at a much higher RPM like 6600. If someone tells you their SC motor makes 240 at 5800 then you know that can't be true because it would have to have a volumetric efficiency that is not possible.
-Andy
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72 Carrera RS replica, Spec 911 racer
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