We ran small propane bottle to start the engine long time ago. Works
real good. The Rotamax engine almost started with no help. This was a
carb. running diesel. We did it with gasoline as well. When it started
the tank line would switch to diesel. This was thru a BN carb. Couldn't
believe it. The Mazda version took more work. I think the easiest way is
to condition the fuel before compression. Heat! easy.
The Mazda version had the fuel injector in the trailing spark plug hole.
We called it trailing injection.

Skip Gorman


Skip Gorman:

Will OMC/RotaMax design work without evaporative cooling of fuel  that has
to be injected BEFORE the air passes through the rotor ?

JCP