Originally Posted by agent4573
My main goal is to find out how 94UL affects detonation margin on an engine....
....If 100LL starts to knock during the takeoff roll at 28 degrees advance, and 94UL starts to knock at 26, then I know I have to pull 2 degrees of timing out whenever I fill up with 94UL....
Just re read this part. Why on earth would you want timing set anywhere near this on takeoff? My 8.5 engine is set to 17 degrees on TO. It's a set and forget issue - 100LL or car gas, the engine is not going to detonate.
WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Harmon Rocket II -SDS EFI
1940 Taylorcraft BL-65
1984 L39C - SOLD
RV-8 - SDS CPI - SOLD