Posted by MarkB_MI on June 14, 2021 at 02:49:47 from (174.230.18.126):
In Reply to: Aircraft fuel posted by Dylan Berhorst on June 13, 2021 at 04:26:42:
What do you hope to gain running avgas in your tractor? Unless you have very high compression, you don't need a high octane fuel.
When 100LL was first introduced, it was supposed to replace both 100/130 and 80/87. Pilots with old, low-compression engines (around 7 or 8 to 1) had a lot of problems with lead fouling of spark plugs on 100LL, which led to Supplemental Type Certificates allowing the use of unleaded mogas in aircraft. Contrary to popular belief, the mogas STCs were never about saving money but rather replacing a fuel that was no longer available (80/87).
A big plus for avgas is its low volatility. Avgas has a maximum Reid Vapor Pressure of 7 psi, so it has a very long shelf life. HOWEVER, summer grade fuel in the US is now limited to 7.8 psi, and in some areas to 7.0 psi, just like avgas. Ethanol blends are allowed an extra one psi. Winter grade fuel can be up to 9 psi RVP.
In many states, including Michigan, you can buy REC-90 fuel, which is supposedly ethanol-free. I've tried to find if there's an RVP spec for REC-90, and I've haven't found one. In fact, I haven't found ANY published spec for REC-90, which leads me to wonder if it's anything other than rebranded unleaded mogas. I assume it has to meet the local RVP requirements for mogas, but I don't know that for sure.
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