Kelly, I'm not trying to be agrumentative here. It's just that the physics and chemistry is important. I think Stewart hit on the point that I was thinking about and what was mentioned on the Goran Olson site. Team race guys want to delay ignition so they can run a higer compression but also burn the fuel quick enough to get the most power out of it. That's why they use the various additives in the fuel. A chemist well versed in this may give us the answers we need. I would like to run higher compression ratio to make more power. At this point I think a fuel with a high cetane rating but higher autoignition temperature than kerosene would do the trick, if all it's other properties make it useful.

I did find that D-Star was using 3% oil in a government bid or something. I did not see the preheat requirement. DDD had a proposal for that contract too.

I used to think that the glow engines we have can't survive high CR. I don't believe that any more. Even so, it would only take a slightly larger crank and rod to do it.