J0nathan225 Posted July 4, 2018 Report Share Posted July 4, 2018 Well I was planning to see a long time friend in Nashville today, got to the plane at 6am prepped, refueled, and topped off oil (7.2quarts). During the runup though when I went to left mag the RPM dropped 220-300 and EGT on #2 dropped 500+degrees. I thought fouled plugs ar first, especially because I didn't look at the egt for some time. I tried clearing the plugs 2-3 times, right side got real clean, by the third check rpm only dropped 25. Left side differnt story rpm drop lessened to the ~220, but still #2EGT dropped rapidly running on the left mag. Just double checking my thought process: my #2 cyl's bottom spark plug is not firing correct? Video posted. 20180704_073418.mp4 Quote Link to comment Share on other sites More sharing options...
RobertGary1 Posted July 4, 2018 Report Share Posted July 4, 2018 Just carry an extra plug in the back. You can just swap it yourself. -Robert 1 Quote Link to comment Share on other sites More sharing options...
jaylw314 Posted July 4, 2018 Report Share Posted July 4, 2018 Not the only possibility, but seems likely. Word of caution, I always got confused on the starter switch as to which mag was being grounded. "R" means right mag is running, even though it's in the left of "L". I realize that means it's the left mag that grounded, but it's always confused me. IIRC, the left mag fires the lower left plugs (2 & 4) and upper right plugs (1 & 3). So assuming you know which mag is running, yes it sounds like the #2 cylinder lower plug is not firing. I carry around a torque wrench with a spark plug socket, a couple crescent wrenches, thread antiseize, and an extra Tempest spark plug (they come nicely packaged with a new copper washer in a durable plastic tube) Incidentally, with the G2, is there a setting to increase the sensitivity of the bar graph? That makes the mag check simpler--you'll see the EGT's rise by 30-50 degF when you switch to one mag. No need watching the RPM's, just makes sure they all go up at the same time. Quote Link to comment Share on other sites More sharing options...
gsxrpilot Posted July 4, 2018 Report Share Posted July 4, 2018 1 hour ago, jaylw314 said: Incidentally, with the G2, is there a setting to increase the sensitivity of the bar graph? That makes the mag check simpler--you'll see the EGT's rise by 30-50 degF when you switch to one mag. No need watching the RPM's, just makes sure they all go up at the same time. I think GEM calls it EGT smoothing. Quote Link to comment Share on other sites More sharing options...
J0nathan225 Posted July 5, 2018 Author Report Share Posted July 5, 2018 Well cleaned and swapped 2/4s plugs. All is well after a media blasting and removal of what looked like a large lead ball. I was flying 1.5hrs in the pattern last night mostly rich, I imagine that's what did it. Live and learn! 1 Quote Link to comment Share on other sites More sharing options...
Yetti Posted July 5, 2018 Report Share Posted July 5, 2018 What plugs are you running? On landing roll I will pull the mixture to about 1/4 open. Also from basic training will do most idle at 1100-1200 RPM Only go below that for taxi. Quote Link to comment Share on other sites More sharing options...
J0nathan225 Posted July 5, 2018 Author Report Share Posted July 5, 2018 urem38e 9 hours ago, Yetti said: What plugs are you running? On landing roll I will pull the mixture to about 1/4 open. Also from basic training will do most idle at 1100-1200 RPM Only go below that for taxi. Quote Link to comment Share on other sites More sharing options...
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