The University of North Dakota John D. Odegard School of Aerospace Sciences has released a two-page communication concluding that engines that had been operated on Swift Fuels 94UL unleaded fuel experienced more than 128 episodes of recessed valve seats or other valve problems. The report details the flight operation’s experience switching from 100LL avgas to Swift Fuels unleaded 94UL and then back to 100LL.
This is a companion discussion topic for the original entry at https://www.avweb.com/aviation-news/und-report-details-valve-issues-experienced-with-swift-fuel-94ul