I made a mistake. The 2-3 times is based on the latent heat of vaporization and doesn't consider the fact that it also flows twice as much methanol per cycle. A glow engine is very dependent on fuel consumption for cooling. Team race engines have substantial(compared to glow) cooling fins. They also use integral liners like the Norvels for a direct heat path. But something in a similar class like the MVVS 2.5 has very little fin area.

It's a tricky game. I think only testing will give us the answers we are looking for.

Blending gasoline with kerosene will substantially reduce the mixture's cetane rating. I don't think this is a good idea.

Greg