Posted by MarkB_MI on May 12, 2016 at 15:23:35 from (70.194.19.88):
In Reply to: 100LL Avgas posted by Eric in IL on May 12, 2016 at 07:18:01:
It is a fact that avgas has a long shelf life, but you need to understand why. Avgas evaporates slowly because its Reid Vapor Pressure can be no more than 7 psi. The vapor pressure requirement is not intended to improve shelf life, but rather to prevent vapor lock at high altitude or on hot days. The lower the vapor pressure, the less volatile the fuel and the longer its shelf life.
There was a time when there was a big difference in the RVP of avgas versus auto fuel, but that's no longer really the case. Over the years, tightening emission standards have significantly lowered the maximum vapor pressure of fuel in many localities. In some places, it's the same as avgas: 7 psi. In other locations, summer-grade gas is allowed to be only slightly more volatile than avgas. Refer to the link below to see the maximum vapor allowed in your area.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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