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 - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
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