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ethanol

in General Tech Discussion 13 years ago
what is th recommended % ethanol to be used in 912?

  • Re: ethanol

    by » 13 years ago

    Rotax has in writing that up to 10% ethanol use is okay for the engine, but you should also make sure that your fuel tanks are okay with ethanol use too. Most of the fuel lines of today can handle ethanol. You should be using real fuel lines and not using some of the clear plastic tubing. Some of these plastic tubing lines don't do well with ethanol and plastic fuel lines are not UV protected and they do become hard and are more susceptible to cracking and breaking from the vibration as they age and get hard.

    A good fuel injection fuel line works well. Clamps are another issue and fuel lines should have some type of band clamp (an example would be an Oetiker band clamp) and not a worm drive screw clamp. All fuel and oil lines should be fire sleeved and band clamps used. For example the fire sleeve may have Band-It type clamps to secure the ends. Using the proper clamps in the proper place is for your safety.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

      
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  • Re: ethanol

    by » 13 years ago

    My 2 cents on Oetiker clamps is that there a PITA, they have to be destroyed to remove them, my suggestion is this type of clamp http://www.vossind.com/spring-loaded%20text.htm their well made and reusable and another nice feature is that if there any expansion of the hose being clamped they allow it to move while keeping constant pressure on the hose.
      
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  • Re: ethanol

    by » 13 years ago

    Hi Ted,


    First of all I'm not saying these are bad clamps, just not for some applications. They are good clamps used in the proper application.
    Those style of clamps shouldn't be used on any fuel lines. They are more or less like the constant compression clamps on the coolant system. It would not be within the ASTM standards. Oetiker band clamps like other band clamps are supposed to be not adjustable on their own and are a positive securing point for that line. They are more or less tamper and fail proof under the heating, cooling and pressure effects. Yes you do need to destroy them to remove them. You can pop them off with the same crimping pliers or use a cut off blade in a Dremel tool. The only constant compression clamp, which these are, are used on the top of the engine on the coolant tank hoses. You should have a good solid positive clamp to keep fuel or oil from oozing, leaking or just having a hose come off in flight.

    It's a safety first and save your skin issue. The few cents involved here aren't worth the risk.

    As a retired firefighter of 30 years and responding to more bad situations and fixing other peoples issues here is a saying we lived by.

    Risk a lot to save a lot, risk a little to save a little.

    Bottom line is don't take unnecessary high risk for such a small issue.

    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell

    Thank you said by: Luis Eduardo Betancourt
      
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