rgf(at)dcn.davis.ca.us
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 Posted: Sun Nov 25, 2007 8:53 am Post subject: RV-List: Removing Ethanol from your car-gas? |
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The flip side of this question is, what exactly is bad about having ethanol
in aviation gasoline? In other words, can we design and build our
experimental airplanes so they use modern auto fuel as-is?
As an owner of an Alon Aircoupe with an autofuel STC--long before ethanol
was added--I've heard of these problems:
* Ethanol is very corrosive to some materials, including seals and some
metals?
* Ethanol readily absorbs water (or vice-versa), so the fuel could then
freeze easier (not in the tanks, but easier carb icing and perhaps in fuel
lines).
* Ethanol's unit heat energy is less than gasoline so you'll get less
performance.
* Any others?
Obviously autos have solved the corrosion problem, can't we do the same with
our experimentals? Greater propensity to freeze (if true, not sure about
this) could be handled with fuel injection and maybe insulated fuel lines
behind the firewall. Lack of performance is probably modest and not a great
concern.
Ralph Finch
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