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Showing results for tags 'lop mag stress test plugs'.
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I did a LOP in flight mag test today because I noticed a slight (get your attention) vibration on my last flight when I pulled back the RPM at reaching cruise altitude. The roughness only lasted a couple seconds but I noticed it. today I climbed to 5500' over the airport and setup straight and level cruise at -70 LOP ( I wanted to get as lean as possible. I didn't pull it back further because I think my IO550G 310 HP Continental will quit before it starts getting too rough. Number 4 has been the richest cylinder lately. It use to be Number 5. Number 3 has been the highest EGT in cruise by about 40-50 °F when cylinder temp is low to mid 300s. attached is the relevant part of the JPI 830 graph for EGT. The first spike is the L mag. The second spike is the R mag. Any comments?? Opinions? Suggestions? Thanks to all that contribute. TomK
