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91 Octane, No Ethanol?

Discussion in 'Rush/Switchback' started by Muffin, Mar 2, 2017.

  1. Muffin

    Muffin Moderator Staff Member Moderator

    Messages:
    35
    Location:
    Athens, WI
    Country:
    USA
    Years Snowmobiling:
    30
    Snowmobile:
    Yamaha Nytro
    Yamaha Viper
    So I just got a new Polaris 800 Switchback and the dealer and manual says 91 no ethanol. I'm used to 4 strokes. What's the problem with ethanol? Do you guys really change the mode on your Sled if you can't find pure gas? I'm used to putting the highest octane I can find regardless of ethanol.
     
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  3. Ry3an7

    Ry3an7 Member

    Messages:
    70
    Location:
    WI
    Country:
    USA
    Years Snowmobiling:
    20
    Snowmobile:
    09 600 IQ Shift, 17 800 Switchback Pro S LE Lime Squeeze
    Small engines especially 2 strokes don't like ethanol. Avoid it if you can. The det sensors are pretty touchy so it'll tell you if it doesn't like the gas you put in it. When in doubt, put it in eth mode and you'll be fine. But you get a tad more performance in non eth mode.
     
  4. Powaton

    Powaton Active Member

    Messages:
    167
    Location:
    Ny
    Country:
    USA
    Years Snowmobiling:
    25
    Snowmobile:
    Pro S 800
    PROCEED AT YOUR OWN RISK. But word on the street is that you can run 93octane 10% ethanol in non ethanol mode and maybe even see a little performance bump.

    Ethanol is bad for storage and fuel systems that arn't built for it. It also has about 30% less energy per volume than regular petrol.

    That's why it has a bad reputation in powersports.

    But, the Axys is a bit rich stock. So the small ethanol content in e10 leans things out to a good point for power and the splash of ethanol provides a margin for detonation.

    Ethanol has a high octane and more importantly is an over achiever when it comes to cooling the combustion process to a point where detonation becomes less likely. It acts higher octane than its rating would suggest. Turbo applications, especially direct injection, are an awesome example of this. Guys tuning the latest generation Volkswagen Golf and BMW turbo cars are getting near race gas power results with blends as low as e-30. Its almost magical. Guys setting up to run e85, even in n/a applications are seeing wild numbers. Something that started out as a corn lobby emissions boondoggle has turned into a tuners playground. Talk about unintended consequences!
     
    rabbi, stroker2 and Brock like this.
  5. Andrew Zebrun III

    Andrew Zebrun III New Member

    Messages:
    10
    Location:
    Hamburg, New York
    Country:
    USA
    Years Snowmobiling:
    2
    Snowmobile:
    800 Polaris Dragon
    I will use nothing but non ethanol fuel. My 2008 garden tractor ran fine till 2015 when it quit running. The carb was full of water, I'll never run ethanol fuel in my small motors again.
     
  6. Rbell14

    Rbell14 Member

    Messages:
    35
    Location:
    Plymouth, Mi
    Country:
    USA
    Years Snowmobiling:
    10
    Snowmobile:
    2021 Indy VR1 850
    2016 Rush Pro S 600
    I think most stations carry 91 octane but it has some ethanol. Some places sell recreation gas which has zero ethanol. So if I encounter just 91 octane that has some ethanol should I run the sled in ethanol mode, or will 91 with ethanol cause an issue if my sled is set up with non-ethanol.
     
  7. Pro116

    Pro116 Moderator Staff Member Moderator

    Messages:
    277
    Location:
    Shiocton,WI
    I don’t run ethanol in anything. When storing ethanol held up plugs carburetors and injectors.

    I work for one of the largest fuel companies. Almost every 91 octane is ethanol free or it has to be marked. Ethanol bumps the octane rating up by 2 points. So when they put ethanol in 91 it makes 93octane.
    If you ride remote area a lot of times you are forced to run ethanol just try to drain it out of your sled at the end of the year.
     
  8. Rbell14

    Rbell14 Member

    Messages:
    35
    Location:
    Plymouth, Mi
    Country:
    USA
    Years Snowmobiling:
    10
    Snowmobile:
    2021 Indy VR1 850
    2016 Rush Pro S 600
    Good to know. I will pay attention at the pump. I thought 91 had ethanol still so I'm glad to hear it doesn't. Some places sell recreation fuel only and that good. I was more concerned about the franchise gas station with 91.

    Thanks for the info!
     

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