Leo Lichtman wrote:
Besides that, the HP "rating" of an automotive engine is developed at a
certain RPM at full throttle. Unless the car is on a dynamometer, it would
be almost impossible to operate it for any time at that point.


Aircraft engines are operated at near peak torque for long times.
Experimenters are having good luck with Subaru engines, my favorite (the
Pietenpol), used an inline 4 cyl. Ford.
Key items are cooling and lubrication, one needs to start with a good
design, as most modifications are patches at best.

wws