Cosmo, I think all the engines you mentioned should run on no nitro fuel. However they
won't develope as much power, and they probably won't idle worth a flip. If your
application doesn't require that the engine must idle try the Enya. You might also improve
the power output by lowering the head. It would serve you well to find someone in your
area who is knowledgeable on glo engines, because all modern engines are designed to
run on fuel with nitro. The Super Tigre and Enya engines from 40 or more years ago ran
well on FAI fuel, but of course they didn't produce anywhere near the power of todays
engines. One side benefit is no nitro fuel is more economical. That is your engine will run
longer on the same amount of FAI fuel as it would on nitro fuel. Greg