Hi ronmar....re: induced draft, I guess it's how you do it. If you hook up blades to your flywheel to blow air through the rad, then it will. If you use the "natural" draft produced by the spokes it won't. I can't use that however because with the "heavy" flywheels, there are no spokes which don't produce enough draft for heavy use in hot conditions.
If you are talking about radiators set high up and using a focused draft by convection only, that would work except in heavy use conditions in hot weather. It's like subway gates, how many do you need, you need enough for the highest useage conditions or your machine will boil and overheat at the worst time.
Stan