Today's Message Index:
----------------------
1. 06:14 AM - Re: 912 80 hp back-fire on shutdown (ejessee)
2. 06:40 AM - Re: Re: 912 80 hp back-fire on shutdown (David Weaver)
3. 06:58 AM - Re: Re: 912 80 hp back-fire on shutdown (Dashwoodlock)
4. 07:57 AM - Re: Re: 912 80 hp back-fire on shutdown (Richard Girard)
5. 07:58 AM - Re: Re: 912 80 hp back-fire on shutdown (Richard Girard)
6. 08:22 AM - Re: 912 80 hp back-fire on shutdown (Jason Omelchuck)
7. 09:57 AM - Re: 912 80 hp back-fire on shutdown (ejessee)
8. 06:57 PM - Re: 912 80 hp back-fire on shutdown (dashwood)
Message 1
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| Subject: | Re: 912 80 hp back-fire on shutdown |
Dave,
Thank you for the information. This "crab Idle jet"... is that in the carburetor?
--------
Ernest Jessee
N4931M
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=365207#365207
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| Subject: | Re: 912 80 hp back-fire on shutdown |
No....that discomfort which some may suffer when flying was not what I was
referring to.- The typo was not intended to cast me as a comedian.- I w
ill strive toward better editing in the future.
Dave Weaver
--- On Mon, 1/30/12, ejessee <eejessee@us.ibm.com> wrote:
From: ejessee <eejessee@us.ibm.com>
Subject: RotaxEngines-List: Re: 912 80 hp back-fire on shutdown
Dave,
Thank you for the information.- This "crab Idle jet"... is that in the ca
rburetor?
--------
Ernest Jessee
N4931M
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=365207#365207
le, List Admin.
Message 3
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| Subject: | Re: 912 80 hp back-fire on shutdown |
if you have to ask this question. you have to get an engine mechanic to do
the work...
--- On Mon, 1/30/12, ejessee <eejessee@us.ibm.com> wrote:
From: ejessee <eejessee@us.ibm.com>
Subject: RotaxEngines-List: Re: 912 80 hp back-fire on shutdown
Received: Monday, January 30, 2012, 9:11 AM
Dave,
Thank you for the information.- This "crab Idle jet"... is that in the ca
rburetor?
--------
Ernest Jessee
N4931M
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=365207#365207
le, List Admin.
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| Subject: | Re: 912 80 hp back-fire on shutdown |
Sounds like something from "Spongebob Squarepants" doesn't it? Clearly, too
much time watching videos with my five year old grandson.
Rick
On Mon, Jan 30, 2012 at 8:11 AM, ejessee <eejessee@us.ibm.com> wrote:
>
> Dave,
> Thank you for the information. This "crab Idle jet"... is that in the
> carburetor?
>
> --------
> Ernest Jessee
> N4931M
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=365207#365207
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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| Subject: | Re: 912 80 hp back-fire on shutdown |
Dave, Hope you didn't mind the ribbing. It was pretty good comic relief and
a smile or laugh is invaluable these days.
Rick
On Mon, Jan 30, 2012 at 8:38 AM, David Weaver <mortweaver@sbcglobal.net>wrote:
> No....that discomfort which some may suffer when flying was not what I was
> referring to. The typo was not intended to cast me as a comedian. I will
> strive toward better editing in the future.
> Dave Weaver
>
> --- On *Mon, 1/30/12, ejessee <eejessee@us.ibm.com>* wrote:
>
>
> From: ejessee <eejessee@us.ibm.com>
> Subject: RotaxEngines-List: Re: 912 80 hp back-fire on shutdown
> To: rotaxengines-list@matronics.com
> Date: Monday, January 30, 2012, 8:11 AM
>
> >
>
> Dave,
> Thank you for the information. This "crab Idle jet"... is that in the
> carburetor?
>
> --------
> Ernest Jessee
> N4931M
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=365207#365207
>
>
> onics.com/Navigator?RotaxEngines-List" target=_blank>http://www.matronics;
> -Maww.matronics.com/contribution" ======
>
>
> *
>
> *
>
>
--
Zulu Delta
Mk IIIC
Thanks, Homer GBYM
It isn't necessary to have relatives in Kansas City in order to be unhappy.
- Groucho Marx
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| Subject: | Re: 912 80 hp back-fire on shutdown |
Technically a back fire is through the carbs and an after fire comes out of the
exhaust. It might be possible that the heat wrapping on the exhaust allows the
exhaust pipes to get hot enough to ignite a fuel air mixture. When you turn
the engine off, it pumps some un-burned mixture through the engine where it
is ignited in the exhaust.
my $.02 worth
Jason
ejessee wrote:
> Hello all,
> I did a search in the forum with "backfire", "back-fire", and "back fire" with
no results, So here goes....
>
> I have an 80 hp 912 UL on a Zenith 701. When I return to my hangar after flight,
unless I do a 2 -3 minute stabilization run at 2100 RPM, my 912 backfires
like a shotgun when I turn it off. I have newly rebuilt carbs, perfectly balanced
carbs, plugs at .024. The engine runs perfect, uses no oil. My exhaust
stacks are heat-wrapped. As severely as it backfires, I am afraid I am going
to damage my exhaust system.
>
> Anyone else ever experience this? Anybody know what is causing it. Is something
wrong or is this just the nature of the engine.
>
> AS always, thanks for your help. This forum is a fantastic resource.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=365224#365224
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| Subject: | Re: 912 80 hp back-fire on shutdown |
Thanks. I have suspected the heat wrap as perhaps adding to the problem.
As for the implication that I should get a mechanic... Hey.. I just missed the
joke. I conduct my plane maintenance with humility and try to get someone to
check my work, but I am very capable. I have rebuilt my airframe, and have worked
on virtually every sub-system on my engine. The A&P who helps me with conditionals
says my plane is one of the best maintained he has every worked on.
I am not intimately familiar with the name of jets in the carbs.
Sorry for taking a bit of offense. I just hate condescension.
--------
Ernest Jessee
N4931M
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=365232#365232
Message 8
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| Subject: | Re: 912 80 hp back-fire on shutdown |
sorry if i sounded condescending. my humblest apologies. i was on a tight schedule
at work and didn't have time to elaborate. I agree the problem is likely
in the carb jetting /blockage. at the idle setting. it sounds like the idle
rpm is correct. is there any exhaust leaks hidden by the wraps.. i was always
told that backfiring had to have oxygen induced to ignite the unburnt gasses.
backfiring opens the hole to cause more backfiring to cause bigger hole .. and
around we go. the unburnt fuel has to be coming from somewhere though.??one
bad carb and one good one would be hard to notice. maybe a little more vibration.
but a partial flooding of one side would only show on the plugs at that
point of shutdown...
remember that you will find a variety of blackness inherent in rotax engines b/c
of the poor intake manifolds dispersement. Pleas keep us informed on what you
find...
--------
Ross Aalexander: CH701 driver 912ul 589tt
It only takes two things to fly, airspeed and money
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=365270#365270
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