Rotor/Reluctor Phasing Question

TrailBeast said
Just a note on what I exerienced.
The HEI ignition seemed to advance my timing due to the fuel igniting faster I guess, because I had a WOT ping that was not there before the change.
My base timing was still the same 14 degrees so I disconnected the vac advance completely and between the base timing and the weighted advance the total timing is just about 2 degrees before the ping at WOT.
(If I set the base timing at 16 it gets the wide open ping again) and I know for sure it's not running too lean causing the ping.


This is at 5,500 feet elevation on 89 gas.
Click to expand...

Actually, my guess would be not that your timing changed, but that the improved combustion from the HEI upgrade probably increased the strength of the combustion pressure wave, which increases peak cylinder pressure. Too high a peak cylinder pressure and you get detonation, i.e., ping. So you might need to dial in a couple degrees less advance.....