In loving memory of Kenis D. Keathley 6/4/81 - 3/27/22 Loving father, husband, brother, friend and firewood hoarder Rest in peace, Dexterday

Ethanol fuel or Aviation fuel

Discussion in 'Chainsaws and Power Equipment' started by Kevin Smith, Aug 21, 2014.

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  1. mdavlee

    mdavlee

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    I seen 110 for $6.99 today. I don't think I'll be trying it at that price.
     
    mdavlee, Aug 22, 2014
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  2. PullinMyPoulan

    PullinMyPoulan

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    KRL nails it I have been telling people about puregas for a while but I hear the line, "I run only the premium in mine". I am very fortunate to have a station that is only 16 miles away and they carry 90 ethanol free which is about 30 to 40 cents more than regular gas.I usually get 5 gallons at a time but only mix a gallon at a time
     
    PullinMyPoulan, Aug 22, 2014
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  3. clemsonfor

    clemsonfor

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    I have the pure gas app for my android phone. Y'all with smart phones should get it.
     
    clemsonfor, Aug 22, 2014
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  4. PullinMyPoulan

    PullinMyPoulan

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    I have a smart phone but can't figure out how to use it:hair::mad:
     
    PullinMyPoulan, Aug 22, 2014
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  5. Kg461

    Kg461

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    Screenshot_2014-08-22-14-52-02.png
     
    Kg461, Aug 22, 2014
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  6. clemsonfor

    clemsonfor

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    I have learned a lot in the year I have had one. Dex has taught me a lot about them when I have asked!!!
     
    clemsonfor, Aug 22, 2014
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  7. MasterMech

    MasterMech The Mechanical Moderator

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    Compression ratio does not tell the whole story. Engine design, bore diameter, combustion chamber shape all play a part too. My last truck, a 2005 GMC Canyon with the 3.5L I5 had a compression ratio close to 11:1 IIRC and it ran just fine on 87.
     
    MasterMech, Aug 22, 2014
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  8. nate

    nate Banned

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    That chart is about correct for older pre computer stuff. The newer stuff with knock sensors, timed injector spray, adjustable timing, etc can do much more.
     
    nate, Aug 22, 2014
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  9. Tiewire

    Tiewire

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    When you take the ethanol out of the gas what does it do to the octane rating. I believe ethanol has a much higher octane rating over gas but you're only losing 10% so maybe it won't matter much. Anybody know?
     
    Tiewire, Aug 22, 2014
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  10. clemsonfor

    clemsonfor

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    Taking the ethanol out will lower the octane rating.
     
    clemsonfor, Aug 22, 2014
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  11. Tiewire

    Tiewire

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    So if you start with 87 or 89 octane how much will the octane be lowered?
     
    Tiewire, Aug 22, 2014
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  12. mdavlee

    mdavlee

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    It will lower your octane. I don't know by how much. I've never seen that part tested.
     
    mdavlee, Aug 22, 2014
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  13. clemsonfor

    clemsonfor

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    Like mike said...I'm not sure?
     
    clemsonfor, Aug 22, 2014
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  14. Tiewire

    Tiewire

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    I was just wondering.
     
    Tiewire, Aug 22, 2014
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  15. Kg461

    Kg461

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    The premix oil Ive heard will also raise the octane
     
    Kg461, Aug 22, 2014
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  16. MasterMech

    MasterMech The Mechanical Moderator

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    Other way 'round. Stihl used to have a snippet somewhere about their 89 octane recommendation being based on the fact that the mix oil slightly (and I do mean slightly.) lowers the octane rating of the fuel.
     
    MasterMech, Aug 22, 2014
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  17. Kg461

    Kg461

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    Chad is fixing to test 110 vs 91 octane in my buddies ported 660 to see if high octane benefits these saws
     
    Kg461, Aug 22, 2014
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  18. Kg461

    Kg461

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    I cant agree with that. Oil will impede ignition of the fuel which is what higher octane also does. Resist ignition?
     
    Kg461, Aug 22, 2014
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  19. clemsonfor

    clemsonfor

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    Someone posted similar tests on AS on a mastermind saw in the last month I beleive
     
    clemsonfor, Aug 22, 2014
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  20. Kg461

    Kg461

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    That was my buddy Ronnie. It was timed cuts but both my MM 461r and his MM 660 is at Chads getting a dyno as we speak. Ronnie and myself have done octane test with timed cuts on AS but wanted to see the test on dyno. So far the higher octane has given both of us slightly faster timed cuts but I know there r variables with timed cuts so thats why we ask Chad to dyno
     
    Kg461, Aug 22, 2014
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