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Thread: aviation gas in chainsaw ok???

  1. 07-07-2011, 10:10 AM #1
    six7bird
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    aviation gas in chainsaw ok???

    can i run 100LL (low lead) aviation fuel in my chainsaw without problems? The stihl dealer here sells vp racing fuel for ten dollars a gallon he said it is 94 octane i can get the aviation fuel for six a gallon. i am thinking both have to be better than the ethenol mixed fuel from the gas station thanks
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  2. 07-07-2011, 10:18 AM #2
    Stumpys Customs
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    Quote Originally Posted by six7bird View Post
    can i run 100LL (low lead) aviation fuel in my chainsaw without problems? The stihl dealer here sells vp racing fuel for ten dollars a gallon he said it is 94 octane i can get the aviation fuel for six a gallon. i am thinking both have to be better than the ethenol mixed fuel from the gas station thanks
    SHouldn't be any problem at all, just make sure you retune it after the switch.
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  3. 07-07-2011, 10:22 AM #3
    blsnelling
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    Lots and lots of threads on this. Opinions are all over the place. I won't run AV gas.
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  4. 07-07-2011, 11:57 AM #4
    Termite
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    I do run 100ll av-gas and like it for the long shelf life. The last thing I do in the winter is run some in my boat motor.
    I had a bad experience with racing gas. It caused the ring to stick in my Dolmar 401. I bought the saw new and the only fuel it saw until the ring stuck was racing gas. The consciences was the additives in the fuel.
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  5. 07-07-2011, 12:45 PM #5
    oneoldbanjo
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    Avgas

    I ran Avgas for about a year in my equipment. It ran OK.....but not any better. It does have a long shelf life and when it evaporates it leaves nothing behind to gum anything up - but it runs too rich unless you retune the carb. I finally stopped running it as the trip to get Avgas is about 1.5 hours round trip.

    Most recently I checked this site: Ethanol-free gas stations in the U.S. and Canada

    I found a station nearby in Indiana that sells 90 octane gasoline without ethanol. Several of the places listed on the site no longer have ethanol free fuel - so you find one near you listed you will have to test the fuel to be sure.

    Before I put my equipment away for an extended period I dump the fuel and then start it and let it idle until it stops. Then I put some Avgas 100LL mixed with the oil of my choice in the tank and restart the engine - then I stop the engine, dump the fuel in the tank back into my Avgas fuel can, and then let the engine idle again until it stops.

    If you run Avgas - be sure to mark the cans so that no one accidently gives it to someone whose car has run out of gas. The lead will foul the catalytic converter.
    Last edited by oneoldbanjo; 07-07-2011 at 12:51 PM.
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  6. 07-07-2011, 09:18 PM #6
    Nitroman
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    Quote Originally Posted by oneoldbanjo View Post
    If you run Avgas - be sure to mark the cans so that no one accidently gives it to someone whose car has run out of gas. The lead will foul the catalytic converter.
    It isn't the convertor so much, but the O2 sensors. This will cause your cars' comp to think it is running super lean and then you'll find out just how much your engine can chugalug gas. Think a 30mpg car going to 10mpg, for real.

    If you have access to both race-gas and AVgas, just buy a gallon of each and mix it the way you'd normally do for your saw. Yes you have to touch up the carb but hell, everybody does that in that in the morning anyways. Find that big gnarly oak or cypress and cut some up with each fuel and see which one you thinks runs the best.
    Last edited by Nitroman; 07-07-2011 at 09:21 PM.
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  7. 07-08-2011, 04:41 AM #7
    Mad Professor
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    100LL is all I have used in my 2-strokes since the nerds in the Gooberment forced E10 or MBTE fuels on us.

    Some saws run richer and need carb reset, some run just fine as they did with pre-E10 premium.
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  8. 07-08-2011, 05:19 AM #8
    cujet
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    100LL is an excellent fuel. It's consistent from batch to batch. So, once tuned, you are good to go.

    Here is something that may not matter to saw users. When GP 2 stroke bikes switched to unleaded, the crankshaft bearings (in particular the con rod big end) life was less than half. Failures became the "norm". It was eventually traced back to the lack of lead in the fuel.

    Since then, a few people have tracked 2 stroke engine life on leaded fuels and sure enough, they do last longer.
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  9. 07-08-2011, 08:26 AM #9
    sachsmo
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    The higher the octane rating the more resistant it is to detonation/pre-ignition. Higher octane burns slower. It is said that it will actually make your saw slower. This may well be the case, but the longer shelf life, resistance to detonation, and complete absence of ethenol makes it the fuel of choice for my saws. (110 leaded Sunoco) I do some milling with my bigger saws, and the piece of mind is worth the 2 or 3 bucks extra per gallon.

    Ethenol is an oxegenated fuel, meaning it introduces more O2 which can make a saw run lean, lean is faster to a point, then you cross that line and it will melt down your saw. The old racers had a saying "lean is mean, but fat is where it's at" N20 works under the same principle, more O2, (lots more) kind of like forced induction. Thus you MUST add fuel (gas) to prevent leaning out to the point of destruction.

    Good fresh pump gas, proper tuning, and good maintenance will suffice for most saws, but if you really push them, such as long rips through thick hardwoods. Why not buy a little insurance?
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  10. 07-08-2011, 09:21 AM #10
    GASoline71
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    You cats that freak out over 10% ethanol make me LOL

    Also cats that run Av-gas, VP, and other stuff in a chainsaw make me LOL...

    89 to 92 octane (even with 10% ethanol) will be just fine for your OPE. Just don't let it set for months on end in your equipment...

    Meh...

    Gary
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    LMAO...
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  11. 07-08-2011, 09:27 AM #11
    sachsmo
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    Quote Originally Posted by GASoline71 View Post
    You cats that freak out over 10% ethanol make me LOL

    Also cats that run Av-gas, VP, and other stuff in a chainsaw make me LOL...

    89 to 92 octane (even with 10% ethanol) will be just fine for your OPE. Just don't let it set for months on end in your equipment...

    Meh...

    Gary
    Oh great wise one,

    You have spoken, it must be the truth. What oil mixes the best with eth?
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  12. 07-08-2011, 09:33 AM #12
    GASoline71
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    I actually agree with what you said genius... relax.

    Gary
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    LMAO...
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  13. 07-08-2011, 09:44 AM #13
    Tree Sling'r
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    Quote Originally Posted by GASoline71 View Post
    You cats that freak out over 10% ethanol make me LOL

    Also cats that run Av-gas, VP, and other stuff in a chainsaw make me LOL...

    89 to 92 octane (even with 10% ethanol) will be just fine for your OPE. Just don't let it set for months on end in your equipment...

    Meh...

    Gary
    Hey bud, if I run diesel, what ratio should I mix it at? What brand of mix?
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  14. 07-08-2011, 09:51 AM #14
    nmurph
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    AV gas---no extra performance----actually diminishes somewhat---89-93 octane is sufficient for everything except modded saw running compression over 200psi

    Ethanol--- no problem, but don't let it sit for months. Buy fuel in batches that will be used in less than 2 months--ethanol or not. Use a fuel stabilizer or two stroke mix with stabilizer added
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  15. 07-08-2011, 09:52 AM #15
    GASoline71
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    If runnin' diesel you should mix with rendered bacon fat @ 77.361:1



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    LMAO...
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