Results 1 to 3 of 3

Thread: MOGAS experts

  1. #1

    MOGAS experts

    I recently read an article in the September Plane and Pilot page 13
    that shows Cherokees PA28s now have an STC to burn 91 octane. Is there
    a reason we cannot do the same? I have O360A4K in my Sundowner.

    Al




    ------------------------ Yahoo! Groups Sponsor --------------------~-->
    Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page
    http://us.click.yahoo.com/dpRU5A/wUI...LSAA/SyTolB/TM
    --------------------------------------------------------------------~->

    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


    Yahoo! Groups Links

    <*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/musketeermail/

    <*> To unsubscribe from this group, send an email to:
    musketeermail-unsubscribe@yahoogroups.com

    <*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/

  2. #2

    MOGAS experts

    >I recently read an article in the September Plane and Pilot page 13
    >that shows Cherokees PA28s now have an STC to burn 91 octane. Is there
    >a reason we cannot do the same? I have O360A4K in my Sundowner.
    >Al

    You mean other than the LACK of an STC? <G>

    The word from those that were doing auto fuel STC research in the 80's is
    that the low wing planes had some problems with vapor pressure, and would
    not pass the FAA "hot fuel" test, that simulates taking off on a heat
    soaked 100 degree ramp and climbing to altitude.

    Because the pressure drops as the plane climbs and the fuel pumps SUCK the
    fuel from the tanks, there seem to be problems with bubbles forming in the
    fuel lines if the fuel was warm.

    The Piper STCs that I have seen required additional electric pumps be
    mounted in the wings to pressurize the fuel from the tank to the
    engine. So the mod can be quite costly.

    There are SOME aircraft with low wings and unmodified fuel systems that
    have STCs for auto fuel. I am familiar with the Grumman American line, and
    have installed the EAA and Petersen auto fuel STCs on several of
    them. They are limited to 160 HP, though. There is no STC for the Grumman
    Tiger with the 180 HP O-360-A4K.

    The good news is that the EPA has mandated lower evaporative emissions from
    cars over the last 20 years, and that has caused the fuel to be LESS
    volatile than when it was tested in the 80's so it MIGHT be possible to get
    the test passed today. The bad news is that it is getting harder to find
    auto fuel without any alcohol in it. In some states all auto fuel is
    diluted with alcohol.

    Those that are interested should contact Todd Petersen at Petersen Aviation
    in Nebraska. It probably means giving up your plane for test flights over
    a period of time. http://www.webworksltd.com/autofuelstc/pa/intro.html

    EAA never did the paperwork for the engines that can not run on 80
    octane. Petersen is the only source for the ENGINE STC that allows the use
    of 91+ octane auto gas in aircraft engines like the O-360 that was
    certified on 91/96 avgas back in the 60's. (Everyone raise hand that
    remembers the old 91/96 avgas.)

    Bob Steward, A&P IA
    Birmingham, AL



    ------------------------ Yahoo! Groups Sponsor --------------------~-->
    Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page
    http://us.click.yahoo.com/dpRU5A/wUI...LSAA/SyTolB/TM
    --------------------------------------------------------------------~->

    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


    Yahoo! Groups Links

    <*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/musketeermail/

    <*> To unsubscribe from this group, send an email to:
    musketeermail-unsubscribe@yahoogroups.com

    <*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/

  3. #3

    MOGAS experts

    My understanding is that there are no mogas STCs for
    any of the Beech line. There is supposedly a vapor
    lock problem in the airframe that is independent of
    the engine so the STC was tried and it failed for all
    models of Sport, Sundowner, Musketeer and Sierra.

    --- Al ODonnell <sundowner6699x@yahoo.com> wrote:

    > I recently read an article in the September Plane
    > and Pilot page 13
    > that shows Cherokees PA28s now have an STC to burn
    > 91 octane. Is there
    > a reason we cannot do the same? I have O360A4K in my
    > Sundowner.
    >
    > Al
    >
    >
    >
    >
    > ------------------------ Yahoo! Groups Sponsor
    > --------------------~-->
    > Get fast access to your favorite Yahoo! Groups. Make
    > Yahoo! your home page
    >
    http://us.click.yahoo.com/dpRU5A/wUI...LSAA/SyTolB/TM
    >
    --------------------------------------------------------------------~->
    >
    >
    > Join BAC today and be a part of the ONLY Type Club
    > for the Musketeer series!
    >
    > www.beechaeroclub.org
    >
    >
    > Yahoo! Groups Links
    >
    >
    > musketeermail-unsubscribe@yahoogroups.com
    >
    >
    >
    >
    >



    ------------------------ Yahoo! Groups Sponsor --------------------~-->
    Get fast access to your favorite Yahoo! Groups. Make Yahoo! your home page
    http://us.click.yahoo.com/dpRU5A/wUI...LSAA/SyTolB/TM
    --------------------------------------------------------------------~->

    Join BAC today and be a part of the ONLY Type Club for the Musketeer series!

    www.beechaeroclub.org


    Yahoo! Groups Links

    <*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/musketeermail/

    <*> To unsubscribe from this group, send an email to:
    musketeermail-unsubscribe@yahoogroups.com

    <*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Single Sign On provided by vBSSO