GrinchF16
Well Known Member
RV7A
O360
1xMag 1xElectronic Ignition
Archaic GRT EIS
Beautiful day to fly. Sitting at EOR, do standard run up and mag check. When I switch to Mag, RPM drops off very rapidly. Back to Both or Electronic Ignition, runs fine. As I cycle through EIS, I see that EGT/CHT numbers on #1 are both significantly below other cylinders regardless of Mag/Electronic Ignition selection.
One A&P says bad Mag, one says check plugs and wires. I understand the logic of both of those but how do you explain away the temps? Seems to me temps indicate not much burning going on yet engine seems fine with Electronic Ignition selected.
Mea culpa - I’m a decent pilot, the mechanics side is new to me.
O360
1xMag 1xElectronic Ignition
Archaic GRT EIS
Beautiful day to fly. Sitting at EOR, do standard run up and mag check. When I switch to Mag, RPM drops off very rapidly. Back to Both or Electronic Ignition, runs fine. As I cycle through EIS, I see that EGT/CHT numbers on #1 are both significantly below other cylinders regardless of Mag/Electronic Ignition selection.
One A&P says bad Mag, one says check plugs and wires. I understand the logic of both of those but how do you explain away the temps? Seems to me temps indicate not much burning going on yet engine seems fine with Electronic Ignition selected.
Mea culpa - I’m a decent pilot, the mechanics side is new to me.
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