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#6
June 24th 04, 09:45 PM
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The key is that with two plugs, the combustion _in the cylinder_ is more
complete, earlier. When one mag cuts, the fuel air mixture still fully burns, but the burn is continued slightly latter (where it does less work on I can confirm that an engine running on one mag will show a higher EGT than on both mags. I went through the preflight, run-up, took off and during full-power climbout, I noticed a significantly higher EGT than I was used to. Startled me until I discovered that in the pre-takeoff mag check I had left the mag switch on only one mag - I took off and was climbing on a single mag. Duh! Switching to both mags brought the EGT back down to normal. 
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