So today I picked up my plane in SLC (Salt Lake City) from maintenance and flew it to OGD (Ogden). This is a short hop of 24nm but it is pretty action packed. You fly through SLC class B, 2 approach frequencies, Hill Air Force Base airspace and frequency and finally Ogden Class D airspace. Along the way you need to pick up Ogden ATIS. Also, the assigned route is typically to follow I15 with a tight altitude restriction and plenty of conflicting traffic. Because you are following I 15 and then the Salt Lake shoreline you really have to hand fly it.
The plane was in for an oil change but also to check CHTs, which have been running high ever since the annual a few weeks ago. I figured this was probably due to summer, but worth checking nonetheless. So anyway, I leave SLC during the morning push. I follow a tail dragger who stops in the middle of the taxiway before the hold short line thus blocking the run-up area. With 5 Delta jets waiting for the same runway on the other side, I figure it's going to be a while and I just do the run-up right there. Everything is normal. MY SOP is to lean for peak RPM during the run-up, then 3 clicks forward for takeoff. During the roll I richen until EGTs are below 1,200 (this keeps CHTs below 380 on the climb).
On takeoff, everything is normal except I can't get the EGTs below 1,400 even at full rich which I never need even at sea level. But the engine sounds great, everything is normal and I'm airborne with 7,000 feet of runway ahead of me. On my short flight to Ogden the CHTs are abnormally low (in the 320s) with number 2 at 350 which is really weird. Leaning or richening does nothing to really help this. While I'm paying attention to the engine, I tell myself it sounds normal, all parameters are in spec, I'm in really busy airspace and just fly the plane. Which I do.
After an uneventful landing I taxi to parking and do the SLIM shutdown. I get to ignition and realize when I go to turn the key to off, I just flew home on the right mag.
I have no idea how this happened. I can't pinpoint a distraction that interrupted the run-up although doing it on the taxiway at SLC International was non-stanard. I don't know if I hit the key accidentally. If this ever happens again, I now know what the engine page will look like so I can quickly correct it. Does anyone have a flow or checklist item pre takeoff that checks this? I have 700 hours in my plane and I have never done this before.