<VV> Actual vs. advertised hp
BigD at DaveMorris.com
Thu Mar 10 10:54:57 EST 2005
William Wynne has built a dyno and is doing comparisons between Corvair
engines and certified aircraft engines. He has already determined that the
Continental O-200 engine that is called a "100hp engine" really only puts
out 75hp net, and that the Corvair 110 puts out more than 75. He has not
yet published all his data, but if you keep an eye on this page:
http://www.flycorvair.com/thrust.html you should be able to see what he has
been able to measure pretty accurately for Corvair engines with a prop
attached. I know it's not exactly what you're looking for, but might
provide some interesting insight that you don't otherwise have.
At 10:32 AM 3/10/2005 -0500, you wrote:
> >Would one of those electronic gadgets like Ned was using be accurate enough?
>No, because the gadget calculates HP using acceleration and the formulas
>used at best could only calculate average HP, not true peak HP. They do not
>accurately calculate hp on turbocharged engines nor any engine with a
>really sharp hp peak. They are best used to compare modifications on a
>given a starting baseline, not to really compare engines to each other.
>However, it would give us a good idea of "real world" performance.... does
>a lower and
>wider torque curve mean more than a high sharp curve? And to what speeds?
>This is the sort of thing that allows a 140 to outrun 180 to certain speeds.
>Even using chassis hp as a comparison is also somewhat suspect becuase of
>the ptential for different levels of parasitic loss between cars, but
>be a better way of doing it.
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