Lou, if you haven't found the lower heating value of fuel components you haven't looked enough. The www is a huge place these days, but you have to be careful about where you find your information. We really don't care what volumetric efficiency is as a user. The most useful figure will be BSFC if consumption is even important to the user. While tests of 50 years ago are still interesting, they don't really mean much when we talk about modern schnuerle ported engines.

If you are going to run a built as diesel fast, it should be designed to run fast. Some just aren't capable. Just how much difference is there in compression ratio between 10k and 20k? How much different is a plain PAW .15 and a tuned combat or team race version?

An Enya .25SS Diesel can't turn a 12x6 at 9k. That's just wishful thinking. Unless somebody has one that actually makes that kind of power.

http://www.modelflight.com.au/manual..._SS_Diesel.pdf

http://www.dkd.net/clmodels/acln/acln130.pdf