<<<Here is a link to a hp comparison of late-model 600cc bike engines:
http://www.sportrider.com/bikes/046_0607_middleweights_dyno_testing/photo
_01.html
Follow the "Next" link just below the dyno chart to check out the
torque
ratings.
You will notice that the engines are rated at about 105 to 110 hp, AT
THE REAR
WHEEL. >>>
Yes, but their torque output is only in the mid-40s. If you keep in
mind that you actually have to shift these engines, rather than running
a CVT, the net effect is probably closer than you think to our
Rotax/CVT system. A national-level FF engine is between 110 and 120
hp at the crank with a bunch more torque, and we run identical lap
times; the lower weight of an F500 probably makes this pretty close to
an even match.
<<<This is quite a bit more than what I understand a Rotax 494 will
make, so bike engines would have to be restricted, perhaps with a
SAE-style flat-plate intake restrictor.>>>
The SIR that is in use in some of the other classes (including the new
F1000) is probably a better method, if restriction is necessary.
Frankly, though, I would suggest that the real application of the SIR
is to minimize the impact of engine mods vs. a stock 'junkyard' engine.
MM
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