I'm glad Walter fixed this thread cause I was ready stop going LOP on the io550 legacy at full power. I know where that flow is so I just pull it back quickly and it goes from 26 to 13gph. Sure kills high CHTs in a heartbeat and saves fuel on long cross country trips. If the plugs and mags are good there isn't a shake or misfire...the old champions acted far differently, you definitely knew when LOP was in play.
Paul
There is absolutely NO reason not to operate the engine LOP at high power settings. Literally, thousands of pilots are doing so quite successfully.
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