On the other hand, there's this...
Citing Valve Damage, UND Drops Unleaded Fuel And Returns To 100LL
"After an extensive trial, the University of North Dakota’s flight school has dropped Swift UL94 fuel and resumed use of 100LL. The school said ongoing maintenance monitoring of aircraft using UL94—almost exclusively Lycoming-powered Piper Archers and Seminoles—resulted in measurable exhaust valve recession. The school made the switch back to 100LL on Oct. 27."
www<dot>avweb<dot>com/aviation-news/citing-valve-damage-und-drops-unleaded-fuel-and-returns-to-100ll/
Sounds like we need to continue to work on some engine improvements for UL fuel. We did it with automobiles so we can do it with our aviation engines. But are Lycoming and Continental - or someone aftermarket - willing to invest the time and money to get that done...? Probably not. For them, the certification focuses on safety not service life (looking at your cylinders, Lycoming).
This won't be fun. - GA
P.S., Paul Bertorelli has always been one of my fav aviation writers. His retirement is a loss for us all...but he's not totally gone away. Good.
Last edited by GregAmy; 27th Feb 2024 at 11:47.