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Thread: Throttle on start

  1. #1

    Throttle on start

    Any ideas on why the POH has a caution on pumping the throttle to start.

    I have a 78 Sundowner. My mechanic started it by pumping the throttle.
    When I told him the POH says not to do that he said it there was no
    harm in doing it.

    Any thoughts

    It does start quicker with a couple of pumps so if no harm it seems to
    help the start.

    Jeff
    N2008T






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  2. #2

    Throttle on start

    >Any ideas on why the POH has a caution on pumping the throttle to start.
    >I have a 78 Sundowner. My mechanic started it by pumping the throttle.
    >When I told him the POH says not to do that he said it there was no
    >harm in doing it. Any thoughts
    >It does start quicker with a couple of pumps so if no harm it seems to
    >help the start.

    Pumping the throttle causes the accelerator pump to squirt raw fuel into
    the manifold. If there is not sufficient air movement to carry the liquid
    gas to the cylinders, it puddles at the bottom and can run back out of the
    carburetor and create a fire hazard.

    Properly prime, and you won't need to pump the throttle.

    Bob Steward, A&P IA
    Birmingham, AL



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  3. #3

    Throttle on start

    --- In musketeermail@yahoogroups.com, Bob Steward <n76lima@m...>
    wrote:
    >
    Thanks for the info. Facts from owners are priceless! There is way to
    much old school hangar talk from people that are not up to speed on
    our airplanes.

    Jeff Ryndak
    N2008T




    > >Any ideas on why the POH has a caution on pumping the throttle to
    start.
    > >I have a 78 Sundowner. My mechanic started it by pumping the
    throttle.
    > >When I told him the POH says not to do that he said it there was no
    > >harm in doing it. Any thoughts
    > >It does start quicker with a couple of pumps so if no harm it
    seems to
    > >help the start.
    >
    > Pumping the throttle causes the accelerator pump to squirt raw fuel
    into
    > the manifold. If there is not sufficient air movement to carry the
    liquid
    > gas to the cylinders, it puddles at the bottom and can run back out
    of the
    > carburetor and create a fire hazard.
    >
    > Properly prime, and you won't need to pump the throttle.
    >
    > Bob Steward, A&P IA
    > Birmingham, AL
    >







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

    www.beechaeroclub.org


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  4. #4

    Throttle on start

    I found the same as Bob mentions. After disliking the startup and the over
    rich running. I have found if I prime 5-7 times I can cold start with an
    idle and not worry about the initial high rpm that always bothers me.

    Brent Flory
    Freedom Lawns
    N257RD

    -----Original Message-----
    From: musketeermail@yahoogroups.com [mailto:musketeermail@yahoogroups.com]
    On Behalf Of Jeff Ryndak
    Sent: Friday, January 13, 2006 11:57 AM
    To: musketeermail@yahoogroups.com
    Subject: [musketeermail] Re: Throttle on start

    --- In musketeermail@yahoogroups.com, Bob Steward <n76lima@m...>
    wrote:
    >
    Thanks for the info. Facts from owners are priceless! There is way to
    much old school hangar talk from people that are not up to speed on
    our airplanes.

    Jeff Ryndak
    N2008T




    > >Any ideas on why the POH has a caution on pumping the throttle to
    start.
    > >I have a 78 Sundowner. My mechanic started it by pumping the
    throttle.
    > >When I told him the POH says not to do that he said it there was no
    > >harm in doing it. Any thoughts
    > >It does start quicker with a couple of pumps so if no harm it
    seems to
    > >help the start.
    >
    > Pumping the throttle causes the accelerator pump to squirt raw fuel
    into
    > the manifold. If there is not sufficient air movement to carry the
    liquid
    > gas to the cylinders, it puddles at the bottom and can run back out
    of the
    > carburetor and create a fire hazard.
    >
    > Properly prime, and you won't need to pump the throttle.
    >
    > Bob Steward, A&P IA
    > Birmingham, AL
    >







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

    www.beechaeroclub.org


    Yahoo! Groups Links






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  5. #5

    Throttle on start

    I completely agree with Bob on the fire hazard. My 1969 B23 (a Sundowner
    with one door!) starts well with 4-5 primes and the throttle set for a
    start-up of approximately 1,000 RPM. You can mark this 1,000 RPM
    throttle position on your quadrant or if you have a vernier throttle
    control twist it a certain number of turns (5 turns from throttle
    completely off works for me). What I have being doing the past few
    months when turning off the engine is idle at 1,000 RPM and then pull
    the mixture off. This way the throttle is exactly at 1,000 RPM when I
    start-up the next time. The reason I started pulling the mixture at
    1,000 RPM is that I heard that it is easier on the O-360 than pulling
    the throttle completely back and then pulling the mixture, my previous
    method of shutting down the engine. Comments?

    David Snodgrass
    BAC East Central Regional Director
    Beech Be23 N6083N
    North Manchester, IN

    -----Original Message-----
    From: musketeermail@yahoogroups.com
    [mailto:musketeermail@yahoogroups.com] On Behalf Of Brent Flory
    Sent: Friday, January 13, 2006 12:28 PM
    To: 'Jeff Ryndak'; musketeermail@yahoogroups.com
    Subject: RE: [musketeermail] Re: Throttle on start

    I found the same as Bob mentions. After disliking the startup and the
    over
    rich running. I have found if I prime 5-7 times I can cold start with
    an
    idle and not worry about the initial high rpm that always bothers me.

    Brent Flory
    Freedom Lawns
    N257RD

    -----Original Message-----
    From: musketeermail@yahoogroups.com
    [mailto:musketeermail@yahoogroups.com]
    On Behalf Of Jeff Ryndak
    Sent: Friday, January 13, 2006 11:57 AM
    To: musketeermail@yahoogroups.com
    Subject: [musketeermail] Re: Throttle on start

    --- In musketeermail@yahoogroups.com, Bob Steward <n76lima@m...>
    wrote:
    >
    Thanks for the info. Facts from owners are priceless! There is way to
    much old school hangar talk from people that are not up to speed on
    our airplanes.

    Jeff Ryndak
    N2008T




    > >Any ideas on why the POH has a caution on pumping the throttle to
    start.
    > >I have a 78 Sundowner. My mechanic started it by pumping the
    throttle.
    > >When I told him the POH says not to do that he said it there was no
    > >harm in doing it. Any thoughts
    > >It does start quicker with a couple of pumps so if no harm it
    seems to
    > >help the start.
    >
    > Pumping the throttle causes the accelerator pump to squirt raw fuel
    into
    > the manifold. If there is not sufficient air movement to carry the
    liquid
    > gas to the cylinders, it puddles at the bottom and can run back out
    of the
    > carburetor and create a fire hazard.
    >
    > Properly prime, and you won't need to pump the throttle.
    >
    > Bob Steward, A&P IA
    > Birmingham, AL
    >







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

    www.beechaeroclub.org


    Yahoo! Groups Links






    --
    No virus found in this incoming message.
    Checked by AVG Free Edition.
    Version: 7.1.371 / Virus Database: 267.14.17/228 - Release Date:
    1/12/2006


    --
    No virus found in this outgoing message.
    Checked by AVG Free Edition.
    Version: 7.1.371 / Virus Database: 267.14.17/228 - Release Date:
    1/12/2006




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

    www.beechaeroclub.org


    Yahoo! Groups Links








    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:
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  6. #6

    Throttle on start

    On COLD start I prime 5x and HOLD throttle to idle, once caught, up to
    1000-1100 rpm.
    On HOT start, I HAVE BEEN doing 2 throttle pumps, HOLD to idle and it
    catches REAL FAST... I'll try the One Prime and hold to idle next time.
    I have found that on HOT starts, any throttle off idle make for churning and
    churning, that's how I came up with the 2 pump and hold method to get a
    quick start.

    It amazes me how fast it starts with a simple change in procedure like that.

    Bill
    N9230S 76 Sundowner


    -----Original Message-----
    From: musketeermail@yahoogroups.com [mailto:musketeermail@yahoogroups.com]On
    Behalf Of Brent Flory
    Sent: Friday, January 13, 2006 12:28 PM
    To: 'Jeff Ryndak'; musketeermail@yahoogroups.com
    Subject: RE: [musketeermail] Re: Throttle on start


    I found the same as Bob mentions. After disliking the startup and the over
    rich running. I have found if I prime 5-7 times I can cold start with an
    idle and not worry about the initial high rpm that always bothers me.

    Brent Flory
    Freedom Lawns
    N257RD

    -----Original Message-----
    From: musketeermail@yahoogroups.com [mailto:musketeermail@yahoogroups.com]
    On Behalf Of Jeff Ryndak
    Sent: Friday, January 13, 2006 11:57 AM
    To: musketeermail@yahoogroups.com
    Subject: [musketeermail] Re: Throttle on start

    --- In musketeermail@yahoogroups.com, Bob Steward <n76lima@m...>
    wrote:
    >
    Thanks for the info. Facts from owners are priceless! There is way to
    much old school hangar talk from people that are not up to speed on
    our airplanes.

    Jeff Ryndak
    N2008T




    > >Any ideas on why the POH has a caution on pumping the throttle to
    start.
    > >I have a 78 Sundowner. My mechanic started it by pumping the
    throttle.
    > >When I told him the POH says not to do that he said it there was no
    > >harm in doing it. Any thoughts
    > >It does start quicker with a couple of pumps so if no harm it
    seems to
    > >help the start.
    >
    > Pumping the throttle causes the accelerator pump to squirt raw fuel
    into
    > the manifold. If there is not sufficient air movement to carry the
    liquid
    > gas to the cylinders, it puddles at the bottom and can run back out
    of the
    > carburetor and create a fire hazard.
    >
    > Properly prime, and you won't need to pump the throttle.
    >
    > Bob Steward, A&P IA
    > Birmingham, AL
    >







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

    www.beechaeroclub.org


    Yahoo! Groups Links






    --
    No virus found in this incoming message.
    Checked by AVG Free Edition.
    Version: 7.1.371 / Virus Database: 267.14.17/228 - Release Date: 1/12/2006


    --
    No virus found in this outgoing message.
    Checked by AVG Free Edition.
    Version: 7.1.371 / Virus Database: 267.14.17/228 - Release Date: 1/12/2006




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

    www.beechaeroclub.org


    Yahoo! Groups Links










    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:
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