Chip Sylverne
Final Approach
- Joined
- Jun 17, 2006
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Quit with the negative waves, man.
Ok, let me preface this by saying it's not really a problem, more of a curiosity.
Bendix mags, Lyc O-540. Mags iranned maybe 150 hour ago. On first start of the day, after warming to the oil to 100 deg or so, mag drop both sides is a dead even 61 rpm on a digital tach. All egt rise, no roughness. If I fly to lunch, runup on the way home gives me the usual 61 left side, but right side will give me an extra 20- 30 rpm, to 80 or 90, and the number bounces around a little bit but never exceeds 91, still the same egt rise on all jugs.
Next day, first flight, they are back to dead even.
So it's pretty clear something changes in that right mag when it gets hot, but not enough to throw it out of spec. Most likely suspect?
Bendix mags, Lyc O-540. Mags iranned maybe 150 hour ago. On first start of the day, after warming to the oil to 100 deg or so, mag drop both sides is a dead even 61 rpm on a digital tach. All egt rise, no roughness. If I fly to lunch, runup on the way home gives me the usual 61 left side, but right side will give me an extra 20- 30 rpm, to 80 or 90, and the number bounces around a little bit but never exceeds 91, still the same egt rise on all jugs.
Next day, first flight, they are back to dead even.
So it's pretty clear something changes in that right mag when it gets hot, but not enough to throw it out of spec. Most likely suspect?