A dyno may not be as expensive as Jerry may think. A good friend of mine whom I roomed with while we attended school is an engine inventor of sorts. He has patented his own internal combustion engine based off a Wankel. Anyway, he has either purchased or invented a portable dyno that somehow used water as the ‘friction’ unit. I have no knowledge on just how it works. He has offered to bring it by my friends engine building garages to test their motors. I understand it’s on a trailer.

Six volt guy living in a twelve volt world