Sunday I spent most of the day at the hangar. I redid the magneto timing, and now the engine sounds happier when running on mag only. I tried using my ancient automotive timing light to confirm the mag timing, but it didn’t seem to be working. I bought a new timing light, and found that while it worked on the electronic ignition, it would not trigger the strobe on the mag. Maybe the shielded plug wires are interfering with the inductive pickup. Maybe that old timing light was serviceable after all.

I had Dale Lamport, a local multiple RV builder sit in the cockpit while I tried to check the EI timing, but the sunlight was so bright that the timing marks were only very dimly visible. The timing appeared to be fairly close, but I probably should try it again just before sunset some day.

I also put safety wire back on the prop flange bolts. I installed the compass error placard, and corrected some setup errors on the EIS 4000 engine monitor. And, I did a test of the data recording from the engine monitor, EFIS and GNS 430. I found that I had somehow managed to delete a critical function in the engine monitor recording script - fortunately I use a version control system, and was able to dig back into the earlier versions and repair the damage.