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STC AvGas

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19 Sep 2020 16:17 #1 by Ken Thompson
Replied by Ken Thompson on topic STC AvGas
The STC is for Mogas. Not AvGas. We don’t need an STC to burn Aviation gas.
I have the Mogas STC. It’s not readily available around me so I don’t burn it often. I have a C85 Stroker. My AP who built the engine, said not to put anything less than 91 Octane in it. I would have to drive about 50 miles round trip to get it but for about $2.29 a gallon. It might be worth if. Just not convenient to do it very often.

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12 Sep 2020 16:34 #2 by Edward Moore
Replied by Edward Moore on topic STC AvGas
I use food coloring, small bottle of McCormick red food coloring that allows one to put just one drop in a gas sample collected in one of those clear plastic quick drain tools directly from the 5/6 jug before pouring in to the plane. If no alcohol, the small one drop " ball " stays intact as it falls to the bottom - any alcohol causes the "ball" to break up - easy to see.
Using auto gas will result in a 'blacken" exhaust more so and one may think that the engine is running too rich but the condition is "normal", at least for me but the auto gas sure helps with the plugs as indicated. I do run 100LL at times

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12 Sep 2020 09:13 #3 by Robert Regester
Replied by Robert Regester on topic STC AvGas
The Puregas app lets you know the closest alcohol free gas. Only a couple of places locally here and usually available near boating. I get Countrymark 90 octane. Sure helps to avoid lead fouling.

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31 Aug 2020 11:05 #4 by Ronald Raty
Replied by Ronald Raty on topic STC AvGas
Alcohol absorbs the water so it can't be drained/sumped. That moisture in the system can cause corrosion and other long term problems. If the fuel becomes saturated with water (possible in our open vented fuel systems), then phase separation occurs where in all the alcohol and water separate out and settle to the bottom of the tank. That could be a couple of gallons of alcohol/water mix sitting in the bottom of your tank, and your engine won't run well on a pure water/alcohol mix. Alcohol is also corrosive to plastic, rubber, and some metal components in older engines not designed to run on alcohol. Our old Continentals fall into that category. Example: Some of the Stromberg carburetors have a neoprene needle valve that swells in the presence of alcohol and can cut off fuel. If you still have cork floats, the alcohol will dissolve the shellac and cause the cork to deteriorate and flake, potentially causing blockage.

And, of course, the whole reason we do anything....insurance. The engines are certified to run on alcohol fuels, so if there is an insurance claim and there is alcohol in the fuel......you can guess the results of that.

I have never tried it, but I understand you can put a few drops of water into a vial of gasoline and if the water disappears, alcohol is present. If the water settles to the bottom of the vial, the fuel is alcohol free.
The following user(s) said Thank You: Chris Doggett

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30 Aug 2020 19:38 #5 by Rod Jones
Replied by Rod Jones on topic STC AvGas
Thanks Ron for your input. How does the presents of alcohol affect the engine and is there a way check its presents in the gas?

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30 Aug 2020 17:24 #6 by Ronald Raty
Replied by Ronald Raty on topic STC AvGas
What do you have available without alcohol? You may not have much of a choice in the matter.

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