Doug G. Posted December 4, 2013 Report Share Posted December 4, 2013 Shell's 100LL substitute. http://www.flyingmag.com/news/shell-aviation-has-unleaded-avgas?cmpid=enews120313&spPodID=030&spMailingID=18282083&spUserID=MzQzNjY2MzYxOTYS1&spJobID=240631011&spReportId=MjQwNjMxMDExS0 Link to comment Share on other sites More sharing options...
Ian Posted December 4, 2013 Report Share Posted December 4, 2013 I'm presuming this is the same as the UL91 that has been available over here for about 18 months now, gradually more airfields are starting to stock it as an alternative (and slightly cheaper) to 100LL Avgas and it is certified by Rotax. I've filled up a couple of times when I've been away from home and Mogas wasn't available and so far nothing bad to report. Link to comment Share on other sites More sharing options...
FlyingMonkey Posted December 4, 2013 Report Share Posted December 4, 2013 The new Shell fuel is 100 octane, not 91. So it should be usable in turbocharged and high performance aircraft interchangeably with 100LL. Link to comment Share on other sites More sharing options...
FastEddieB Posted December 4, 2013 Report Share Posted December 4, 2013 The new Shell fuel is 100 octane, not 91. So it should be usable in turbocharged and high performance aircraft interchangeably with 100LL. Unless they need the lead. Right? Link to comment Share on other sites More sharing options...
FlyingMonkey Posted December 4, 2013 Report Share Posted December 4, 2013 Unless they need the lead. Right? I think most airplane engines use lead, in the form of tetraethyl lead, primarily as an octane booster. I think there are very few engines that really need lead to lubricate soft valve seats, which is the other use of lead. Lots of musclecar engines from the 1960s and 70s supposedly used lead for their valve seats, but now run premium lead-free pump gas with no ill effects. The engines that really have a need can probably be served with a lead-free fuel additive. Link to comment Share on other sites More sharing options...
Anticept Posted December 4, 2013 Report Share Posted December 4, 2013 Lead is a tremendous heat scavenger. That's why some engines are having valve heating problems when they switch to unleaded. Link to comment Share on other sites More sharing options...
Roger Lee Posted December 4, 2013 Report Share Posted December 4, 2013 You can buy lead substitutes to add back to UL fuel. Many old antique cars use it. Link to comment Share on other sites More sharing options...
Doug G. Posted December 5, 2013 Author Report Share Posted December 5, 2013 I posted this on the third, surprised you didn't notice. :-) Link to comment Share on other sites More sharing options...
Tom Baker Posted December 5, 2013 Report Share Posted December 5, 2013 i posted this under a different thread yesterday, surprised no one noticed. So many people have you twit blocked because of the crazy inacurate things you often say. Because of that very few people will notice a thread started by you. Link to comment Share on other sites More sharing options...
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