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mprather(at)spro.net
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 Posted: Thu Feb 22, 2007 2:21 pm Post subject: Magneto failure in general, Was: Re: P Mags |
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Agreed.. "backfire" is an imprecise term. I used it to mean "any
explosive combustion event which happens at a time or location where it's
not intended to."
I hope we don't need to invent new terminology to cover the specific case
of unintended explosive combustion in the exhaust system.
Fortunately, I think "Old Bob" understood what I was getting at...
Regards,
Matt
| Quote: |
<nuckollsr(at)cox.net>
At 11:11 AM 2/22/2007 -0700, you wrote:
>
> <mprather(at)spro.net>
>
>Hello Bob,
>
>I have read/been-told that cycling the mag switch while at high power
>settings might cause the engine to backfire if one mag is dead and the
>other is turned back on, and that such a backfire might damage components
>of the intake and exhaust systems.. What do you think about this?
That is a risk. Magenetos will do it too but is it a
"backfire"??? When the engine is totally deprived of
ignition it continues to pull stoichiometric mixture through
the plumbing. Then when any source of ignition returns, there's
a volume full of unburned mixture that includes the entire
exhaust system and any cylinder with an exhaust valve open
at the time this volume gets lit off.
I've experienced this on the ground when doing mag checks
where I inadvertently turned off both mags during a run-up
and then got them back on while the engine was still
turning. Folks have done this in their cars too and I've
heard of mufflers being split open from the resulting
explosion. Hmmm . . . guess we need to agree on the word
"backfire" which I use as ignition on the intake side of the
cylinders. Does this make the exhaust side explosion a
"foreward fire"?????
In the common public vernacular, a loud report from a
vehicle is referred to as "backfire" . . . I suppose because
it blows flames out the back of the car . . .
Oh well, I THINK we know what we're talking about!!!!
Bob . . .
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mprather(at)spro.net
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| Posted: Thu Feb 22, 2007 4:39 pm Post subject: Magneto failure in general, Was: Re: P Mags |
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That's good info. Thanks for passing it along.. I would have guessed
that afterburning refers to a desirable method of increasing thrust on
turbojets, but that's what I get for guessing I suppose. Looking around
on the google, afterburning appears to be a feature whereas afterfiring
appears to be a fault. I probably haven't looked enough yet...
Regards,
Matt-
| Quote: | In FAA terms a backfire would be fire in the intake which would go "back"
through the carb or throttle body. "afterfiring" or "afterburning" is the
term for burning in the exhaust. From a mechanics standpoint it would be
nice to keep them straight because the items to check for damage after a
backfire are different than an afterfire.
Deems
> Date: Thu, 22 Feb 2007 15:25:52 -0600> To:
> aeroelectric-list(at)matronics.com> From: nuckollsr(at)cox.net> Subject: Re:
> Magneto failure in general, Was: Re: P Mags> > I've
> experienced this on the ground when doing mag checks> where I
> inadvertently turned off both mags during a run-up> and then got them
> back on while the engine was still> turning. Folks have done this in
> their cars too and I've> heard of mufflers being split open from the
> resulting> explosion. Hmmm . . . guess we need to agree on the word>
> "backfire" which I use as ignition on the intake side of the> cylinders.
> Does this make the exhaust side explosion a> "foreward fire"?????> > In
> the common public vernacular, a loud report from a> vehicle is referred
> to as "backfire" . . . I suppose because> it blows flames out the back
> of the car . . .> > Oh well, I THINK we know what we're talking
> about!!!!> > Bob . . .=================> > >
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mwcreek(at)frontiernet.ne
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| Posted: Thu Feb 22, 2007 5:32 pm Post subject: Magneto failure in general, Was: Re: P Mags |
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I'm installing the GS-Air LED position lights and strobes powered by Aero
Flash power supplies mounted at the wing tip. I've powered up the position
lights and strobes and I'm very happy with the light output of each and the
low current draw of the LED's. I went with the single flash PS to keep
current draw as low as possible for the strobes. Each wing tip strobe uses
1.5 amps and the LED's are like 0.5 amps.
Mike C.
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