The EI readouts are all over the map
and do not agree with the RPM and MAP displayed on the Grand Rapids EIS.
If the firing angle readout is correct we are at 40 degrees on take off, 32
degrees when cruising ROP but that drops off as we go LOP - and that seems
strange. Could anyone enlighten me on this?
If you are not turbocharged, the ignition timing should be about 25 deg BTDC on take off. It then
should advance a few degrees in cruise and more as you increase
your altitude. The timing could/should be significantly advanced in a
low power decent. Maybe read as much as 40 deg BTDC depending on the MAP and
RPM. Your findings are hopefully bad readings as they are way out of
whack.
Craig Berland