The fuel change will cause performance change. I run my cars 16 int. 36 total anything more is for economy on a cruise.
I figured thats what we were talking about.
I figure if I want performance I will have to sacrifice the economy. My orange duster is locked at 35 . It has a retard built in for start up. I shift it at 8000-8500 its sounds as smooth as a well tuned two stroke.
To a certain point. you could put a little vac advance in for your high vacuum situations and get better econ, of course to much and you'll have our current issue or as you described bearing issues.
The more total you put in a motor the quicker it takes out the rod bearings. Remember The more advance you have the sooner it fires before the piston reaches the top. Causing it to try and reverse the motor. The ping you hear is piston wobble. It will hurt the motor if its missing a high rpms. Cheap fuel burns hotter so it ignites faster and causes pre-ignition. Meaning its firing way before it reaches the top. The slower it burns the more advance you can have. The faster it burns the less advance you can have. Its not when it sparks. its when it ignites.
