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Fuel Orifice

in 912iS Technical Questions 7 years ago

  • Re: Fuel Orifice

    by » 7 years ago

    He may mean he doesn't have the room.

    This engine recirculates so much fuel you're better off with a header tank. Trying to plumb it back to separate wing tanks may bring problems. Plumbing it back to a single tank would work just like a header tank. No overflow issues.

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

      
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  • Re: Fuel Orifice

    by » 7 years ago

    seen the video. Not a fan of header tanks in cockpit or engine bay. very bad in case of bad crash
      
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  • Re: Fuel Orifice

    by » 7 years ago

    yeah Rog, nowhere to put it safely (copy of Czech Sportscruiser) and the aircraft is already certified so too much paperwork involved. The plumbing back to separate tanks causes no issues and works well. Most Header Tanks I have seen in aircraft are not placed in a safe place in the case of a nasty crash, although I think they are a good idea to prevent starvation particularly with the fuel pressure demand of the Is engine. As we have no header tank system in place, that is why I asked about the Orifice. Very helpful feedback guys Thanx
      
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  • Re: Fuel Orifice

    by » 7 years ago

    hey Rob, can not find latest revision of Installation manual mandating the orifice
      
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  • Re: Fuel Orifice

    by » 7 years ago

    In the Rev 3 Installation Manual section 73-00-00 page 7.

    In the section addressing the bypass line they state ...
    [quote]Bypass line
    ... Install a restricted bypass line between the inlet ... and the return line ... a restricted jet must be installed ...[/quote]

    While in the Return line section just before that they state...
    [quote]Return Line
    ... If no Bypass line is installed ...[/quote]

    Which just adds to the confusion.
    You MUST put it in ... BUT If You Don't....

    The documentation department and the design department seem to have a disconnection.

    Interestingly enough, the "If Not" paragraph used to be in the Bypass Section in the Rev 2 manual and now it have been moved to the Return Line section in the Rev 3 manual.

    So, I guess that it is a Highly Recommended / Required component that you can choose to delete at your own risk.

    Just put it in, you'll sleep better! ;)

    ++++++++++++++++++++++++++++++++++++++

    ...
    Not a fan of header tanks in Cockpit or Engine Bay.


    If it is not in the cockpit or engine bay, Where else remains that would make you feel good about it? :unsure:

    Bill Hertzel
    Rotax 912is
    North Ridgeville, OH, USA
    Clicking the "Thank You" is Always Appreciated by Everyone.

      
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