The simple answer to your question is that I am using pump 100LL aviation fuel. I have tested the fuel with a 10% lean condition but flight settings are the original flows. we can run higher boost, but the cost of the testing and the value of the engines make that a non-issue. Why the fuels used by the Germans were of a lower octane, the high power settings usually included Nitrous, water/alchol or some other additive injection for the combat power setting.
We have used much higher power setting with race engines with good sucess and the quality of the internals of the engines are very close.
The construction of the fuel is different but the burn rates are same to a point. I have used 100LL pump av gas at original and as lean as 10%. I set the injectors at the book setting and the engines run normal. The internals of the engines are very good and the potential powers would be higher with 115/145 fuel.
mike nixon
I guess there is a lot of information you guys don't have. when I have time I will start posting some of my data. Mike Nixon of Vintage V-12's check out our web page at vintagev12s.com