An open discussion about the theory of ignition timing and its impact on internal combustion aircraft engines. Too much and too little advance, lean-of-peak operations, the impact of high and low compression pistons, forced induction, nitrous oxide (NO2), and more will be reviewed. This discussion is not ignition specific and is a great opportunity for anyone to learn the impact of adding electronic ignitions to their aircraft engine. Session type: Forum — Skyfarer is not affiliated with the Experimental Aircraft Association (EAA) or EAA AirVenture Oshkosh. This session is listed for informational purposes from the official AirVenture 2026 schedule. Times and locations can change during the event — verify on the official session page: https://events.rdmobile.com/Sessions/Details/3539894