Lycoming Says Aromatics In Fuel, Leaning Techniques May Have Caused Valve Problems - AVweb

Lycoming says it doesn't think its engines are to blame for the valve seat recession problems experienced by the University of North Dakota flight training department last year after it switched to Swift Fuels' UL94 fuel. Rather, it says in a news release (copied in full below) its analysis suggests that "under certain conditions, use of UL94 may impact valve seat recession."


This is a companion discussion topic for the original entry at https://www.avweb.com/aviation-news/lycoming-says-aromatics-in-fuel-leaning-techniques-may-have-caused-valve-problems