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AV Gas

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TexasRedNeck:
Ken I’ve only run avgas for a mix in my hot rods back in the day.

As mentioned you may have some tuning issues given the power density of the higher octane

However that website may not be a complete list. I would search for a farm fuel place near you. Most of the places I’ve bought pure fuel is at farm supply places. You may be able to schedule fuel deliver if you have a tank at the shop too.


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Farmer Jon:
You said AV gas and that brought back some good old memories. I havent used that in a very long time. Not since my demo derby days.
Non ethanol gas is readily available around my area. We never use ethanol on the farm. Old tractors dont like it. I suppose in some parts of the country non ethanol its hard to find.
On the flip side wifes Tahoe is flex fuel and I cant find E85 anywhere around here. 

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Flyin6:
OK, I think I can speak a little about this subject

Aviation gasoline which is widely available in 100 octane is sometimes found in octane ratings I believe as high as 130, or at least it used to be. Honestly I have no idea why since most big piston engines of the aviation sort are more torque engines running around 8:1 to 8.5:1 compression ratios. Perhaps the designers just wanted a big hedge against detonation since grenading a piston at 15,000 over the sierras would be a bad thing.

Airplane piston engines have some pretty big bores and have to produce their horsepower below 3,000 RPM and really between 2,200 and 2,600. Even with the big bores, hemispherical combustion chambers and stadium sized bores they run enough advance to require the added insurance against detonation/Octane.

Av gas is really dry and devoid of lubricants and cleaning agents. Meant to get shoved through old school mechanical fuel injectors or sucked through a carb which shares more in common with a model "T" ford than even a sixties Q-jet, it doesn't have anything that could clog up anything. Now even though modern engines have run low lead gas for some time, there are still additives that clean injectors, promote flame propagation and increase the "Bang." Av-Gas does not have any of that. In fact a lot of airplane owners have converted their airplanes over to run 87 octane car gas.

Now you can mix the av gas with 87 or even 93 depending on your desired results to alleviate some of the chemical deficiencies of the Aviation stuff.

Mostly Av-gas is created and sold as a very dry gas having and being capable of suspending very little water. Frozen fuel lines at 20,000 feet are just as bad as a hole in the cowling where a piston and rod and part of a camshaft departed the A.O. You still get to crash. The bonus is that maybe you will not be engulfed in flames while doing so.

Finally it is illegal for the airport FBO to sell av gas to anyone other than someone buying it to put into something that flies. That is easily solved when you explain you are purchasing it to carry over to your place where you fly your homebuilt or ultra light aero-plane.

Me: I had a buick grand national I ran some with a lot of boost which could have benefited, AND at the same time I owned a super cool PA24-250, 250 Piper Comanche which consumed vast quantities of the aviation stuff. But I purchased the race gas instead because of all the down sides of putting the blue stuff into things with wheels that always maintained contact with the planet.

My two cents...

KensAuto:
Thanks guys.

Don, I forgot about the dry factor. That alone affects my decision, especially on running it in the new toy. Sounds like using it in 2 strokers might be ok.

... just pees me off that my county is following the lead of the neighboring 2 by not allowing straight gas. .. Phoenix to my north, and Tucson to the south are to blame. Large cities ruin everything. Lol

Charles, I'm going to check in with some farmer buddies. ... should've thought of that.

Bigdave_185:
I’d say simplify life and drain fuel from what your not using,

I keep 5 gallons on hand of 32/1 mixed 2-stroke fuel, 10 gallons of diesel, 10 gallons of the ethanol free stuff.  I use what’s needed and pour the rest out of things like saws or off season equipment.   Gave up on leaving fuel in tanks it’s such a pain in the butt

I understand the General should run a lot like a car that’s parked with fuel these days shouldn’t it?  Are you leaving it up north?

I also understand you have more equipment to manage.   

I did for years run AV gas or race fuel in banshees but they were either built for the compression requirements or the added power and dryer fuel was augmented with rebuilt motors on a planned maintenance program 


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