Hi Greg,

Your points are well reasoned. This is how this sort of thing happens. A guy gets a NEARLY all oil mix to "run" and comes to an erroneous conclusion that then gets spread around as gospel. Just because it's on the Internet. Your point about castor was on the money. I thought of trying that but ran out of daylight.

BUT, my reasoning is that if SVO works in the big engines, why not in our little guys? After all, the big ones use kero and also the SVOs. Somehow, the big atomization device handles the thicker oil/fuel. Why not ours? Ah, here's how to observe atomization in our engines. Take the head off, fill the tank and spin the engine with an electric starter. Do this at night with a flashlight providing the light. The spray out the carb was not evident in daylight. At night, it was amazing to see a fountain of spray droplets pouring out the intake. I've installed a screen and no more spray, the screen soaks it up and it gets sucked back into the engine. I anticipate better mileage and that'll be another experiment in the list of things to try already.

And about power/RPM. If the volatiles are only 22%, and only those are burning, surely we would now only be see something like 22% of the RPM over a stock fuel? Or at least far less than 90% RPM.

Maybe next to try is just oil and cetane booster. But sunflower oil is way too thick to be atomized in our little engines. Or is it?

Maybe I can find a very thin, vegetable oil to try. Any ideas? Coconut oil is out, for sure. [:-]