Despite the wording of the title, the use of 100LL avgas in old tractors has nothing to do with the increased octane rating. However, the chemical additive package for avgas which makes it 100 octane, is part of the reason it is so stable, and has a much greater consistency that pump auto gas.
I've seen phase separation(Ethanol coming out of suspension) in auto gas left > 6 months in a humid enviro. This is a big, big problem as most gasket, seals, and other rubber compounds do not do well in a high Ethanol enviro. The percentage, and type of aeromatics left in auto gas would never be allowed in avgas, as the RVP would cause trouble at altitude.
One could say that avgas is a sweeter refinement. which helps last much longer than summer blend auto fuel.
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Today's Featured Article - Restoration Story: 1951 Farmall H - by The Red (John Fritz). I have been a collector of Farmall tractors since 1990 when I first obtained part of the family farm in Eastern Indiana. My current collection includes a 1938 F20, 1945 H, 1946 H, and the recently purchased 1951 H. This article will focus on what I encountered and what I did to bring the 1951 NEAR DEATH Farmall H back to life.
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