Today's Message Index:
----------------------
1. 03:33 AM - Re: Magneto connection (helspersew@aol.com)
2. 07:26 AM - Re: Magneto connection (Glen Schweizer)
3. 11:33 AM - Re: Magneto connection (taildrags)
4. 07:52 PM - Re: Re: Magneto connection (Semih Oksay)
5. 09:29 PM - Re: Re: Magneto connection (Steven Dortch)
Message 1
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Subject: | Re: Magneto connection |
Semih,
You should follow the manual. Connecting the mags that way (Left to bottom plugs)
is traditional, and very helpful, when trying to track down a rough-running
condition problem.
Dan Helsper
Loensloe Airfield
Puryear, TN
-----Original Message-----
From: Jack Textor <jack@textors.com>
Sent: Sat, Mar 25, 2017 5:20 pm
Subject: Re: Pietenpol-List: Magneto connection
Semih wish I could help, maybe somebody will chime in.
Jack Textor
Sent from my iPad
> On Mar 25, 2017, at 11:42 AM, oldbird <semihoksay@gmail.com> wrote:
>
>
> I am working on the ignition harness of my Conti C80-8F. From the manuals, left
mag is connected to bottom plugs, right mag to top plugs.
> A friend gave me a set. From the markings on rear covers and wires, I figured
out that 2 and 4 from left mag are connected to top, and 1 and 3 are connected
to bottom plugs. Likewise, 2 and 4 from the right mag are connected to bottom
and 1 and 3 are connected to top plugs. Now, is this common or correct? Should
I disregard what I hava and stick to the manual's left to bottom, right to
top?
>
> Thanks in advance for any advice.
>
> Semih in Turkey
>
>
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467600#467600
>
>
>
>
>
>
>
>
>
Message 2
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Subject: | Re: Magneto connection |
That wiring schematic is also used on the O-320 h2ad in my Skyhawks
> On Mar 25, 2017, at 3:18 PM, Jack Textor <jack@textors.com> wrote:
>
>
> Semih wish I could help, maybe somebody will chime in.
>
> Jack Textor
>
> Sent from my iPad
>
>> On Mar 25, 2017, at 11:42 AM, oldbird <semihoksay@gmail.com> wrote:
>>
>>
>> I am working on the ignition harness of my Conti C80-8F. From the manuals, left
mag is connected to bottom plugs, right mag to top plugs.
>> A friend gave me a set. From the markings on rear covers and wires, I figured
out that 2 and 4 from left mag are connected to top, and 1 and 3 are connected
to bottom plugs. Likewise, 2 and 4 from the right mag are connected to bottom
and 1 and 3 are connected to top plugs. Now, is this common or correct? Should
I disregard what I hava and stick to the manual's left to bottom, right to
top?
>>
>> Thanks in advance for any advice.
>>
>> Semih in Turkey
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=467600#467600
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
>
>
>
>
Message 3
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Subject: | Re: Magneto connection |
Semih;
I asked the same question of the A&P who rebuilt my A75 with dual Slick mags.
The first time I looked it over before annual condition inspection, I noticed
that the plug wires weren't run the way the book says to. I have a great deal
of respect for my A&P... here's his explanation:
"The manual for the A series Continentals calls for one mag to fire the bottom
plugs and the other to fire the top plugs. The mag firing the bottom plugs is
advanced 3 more than the mag that fires the top plugs. More modern designs (C
series Continentals for example) split the ignition so each mag fires half top
and half bottom plugs. I changed your A-75 to the more modern method with
both mags timed the same, which is contrary to the A series manual.
"There is nothing special about the combustion chamber design that would require
the split timing. It was just a different philosophy back in the 40s when these
engines were built. The primary concern was oil fouling of the lower plugs
and poorer quality spark plugs and magnetos which often times caused misfires,
so by having one mag fire all the top plugs, you could get at least one mag
to run cleanly and the other mag would usually clean up sometime after take
off. With improved oils, rings, etc, and better care of the engines, oil fouling
plugs has mostly become a thing of the past. Most pilots today won't consider
flying on one magneto, but back in the early 40s, dual ignition was relatively
new and a luxury on these small engines.
--------
Oscar Zuniga
Medford, OR
Air Camper NX41CC "Scout"
A75 power, 72x36 Culver prop
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=467642#467642
Message 4
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Subject: | Re: Magneto connection |
Thank you Oscar.
I will go with the more recent configuration.
Semih=8B
On Sun, Mar 26, 2017 at 9:33 PM, taildrags <taildrags@hotmail.com> wrote:
>
> Semih;
>
> I asked the same question of the A&P who rebuilt my A75 with dual Slick
> mags. The first time I looked it over before annual condition inspection
,
> I noticed that the plug wires weren't run the way the book says to. I ha
ve
> a great deal of respect for my A&P... here's his explanation:
>
> "The manual for the A series Continentals calls for one mag to fire the
> bottom plugs and the other to fire the top plugs. The mag firing the
> bottom plugs is advanced 3=C2=B0 more than the mag that fires the top plu
gs.
> More modern designs (C series Continentals for example) split the ignitio
n
> so each mag fires half top and half bottom plugs. I changed your A-75 to
> the more modern method with both mags timed the same, which is contrary t
o
> the A series manual.
>
> "There is nothing special about the combustion chamber design that would
> require the split timing. It was just a different philosophy back in the
> 40s when these engines were built. The primary concern was oil fouling o
f
> the lower plugs and poorer quality spark plugs and magnetos which often
> times caused misfires, so by having one mag fire all the top plugs, you
> could get at least one mag to run cleanly and the other mag would usually
> clean up sometime after take off. With improved oils, rings, etc, and
> better care of the engines, oil fouling plugs has mostly become a thing o
f
> the past. Most pilots today won't consider flying on one magneto, but ba
ck
> in the early 40s, dual ignition was relatively new and a luxury on these
> small engines.
>
> --------
> Oscar Zuniga
> Medford, OR
> Air Camper NX41CC "Scout"
> A75 power, 72x36 Culver prop
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=467642#467642
>
>
===========
===========
===========
===========
===========
>
>
--
Semih Oksay
Message 5
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Subject: | Re: Magneto connection |
A couple of years ago, my buddy was putting new Magnetos on his A65 powered
Aeronca Champ. Lots of airport experts came to help. It would not fire a
lick. My buddy told everyone he was done for the day an started putting up
stuff. Everyone left but him and me. We pulled the mag's and started over
following the manual. Set the timing. Pulled the plane out and pulled it
through 4 blades to prime it. He called out "hot" and it fired on the first
blade! It ran great.
Blue skies,
Steve D
On Mar 26, 2017 9:53 PM, "Semih Oksay" <semihoksay@gmail.com> wrote:
> Thank you Oscar.
>
> I will go with the more recent configuration.
>
> Semih=8B
>
> On Sun, Mar 26, 2017 at 9:33 PM, taildrags <taildrags@hotmail.com> wrote:
>
>
>>
>> Semih;
>>
>> I asked the same question of the A&P who rebuilt my A75 with dual Slick
>> mags. The first time I looked it over before annual condition inspectio
n,
>> I noticed that the plug wires weren't run the way the book says to. I h
ave
>> a great deal of respect for my A&P... here's his explanation:
>>
>> "The manual for the A series Continentals calls for one mag to fire the
>> bottom plugs and the other to fire the top plugs. The mag firing the
>> bottom plugs is advanced 3=C2=B0 more than the mag that fires the top pl
ugs.
>> More modern designs (C series Continentals for example) split the igniti
on
>> so each mag fires half top and half bottom plugs. I changed your A-75 t
o
>> the more modern method with both mags timed the same, which is contrary
to
>> the A series manual.
>>
>> "There is nothing special about the combustion chamber design that would
>> require the split timing. It was just a different philosophy back in th
e
>> 40s when these engines were built. The primary concern was oil fouling
of
>> the lower plugs and poorer quality spark plugs and magnetos which often
>> times caused misfires, so by having one mag fire all the top plugs, you
>> could get at least one mag to run cleanly and the other mag would usuall
y
>> clean up sometime after take off. With improved oils, rings, etc, and
>> better care of the engines, oil fouling plugs has mostly become a thing
of
>> the past. Most pilots today won't consider flying on one magneto, but b
ack
>> in the early 40s, dual ignition was relatively new and a luxury on these
>> small engines.
>>
>> --------
>> Oscar Zuniga
>> Medford, OR
>> Air Camper NX41CC "Scout"
>> A75 power, 72x36 Culver prop
>>
>>
>>
>>
>> Read this topic online here:
>>
>> http://forums.matronics.com/viewtopic.php?p=467642#467642
>>
>>
>>
>>
>>
>>
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>
>
> --
> Semih Oksay
>
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