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Magneto connection

 
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oldbird



Joined: 23 Apr 2015
Posts: 91

PostPosted: Sat Mar 25, 2017 8:42 am    Post subject: Magneto connection Reply with quote

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


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PostPosted: Sat Mar 25, 2017 2:20 pm    Post subject: Magneto connection Reply with quote

Semih wish I could help, maybe somebody will chime in.

Jack Textor

Sent from my iPad

Quote:
On Mar 25, 2017, at 11:42 AM, oldbird <semihoksay(at)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











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aviatorbell(at)yahoo.com
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PostPosted: Sat Mar 25, 2017 3:43 pm    Post subject: Magneto connection Reply with quote

blockquote, div.yahoo_quoted { margin-left: 0 !important; border-left:1px #715FFA solid !important; padding-left:1ex !important; background-color:white !important; } C-80 or is it an A-80-8F. The A series run the left to the bottom as that is the impulse mag. It could be different if you have dual impulse slick mags.
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On Saturday, March 25, 2017, 12:50 PM, oldbird <semihoksay(at)gmail.com> wrote:
Quote:
--> Pietenpol-List message posted by: "oldbird" <semihoksay(at)gmail.com (semihoksay(at)gmail.com)>

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

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PostPosted: Sat Mar 25, 2017 3:43 pm    Post subject: Magneto connection Reply with quote

blockquote, div.yahoo_quoted { margin-left: 0 !important; border-left:1px #715FFA solid !important; padding-left:1ex !important; background-color:white !important; } Also, I believe the A series engines mags turn the opposite of the mags on a C series engine. I forget which one is left hand rotation and which is right hand rotation.

Shad
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On Saturday, March 25, 2017, 6:30 PM, Jack Textor <jack(at)textors.com> wrote:
Quote:
--> Pietenpol-List message posted by: Jack Textor <jack(at)textors.com (jack(at)textors.com)>

Semih wish I could help, maybe somebody will chime in.

Jack Textor

Sent from my iPad

Quote:
On Mar 25, 2017, at 11:42 AM, oldbird <semihoksay(at)gmail.com (semihoksay(at)gmail.com)> wrote:

Quote:


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--> Pietenpol-List message posted by: "oldbird" <semihoksay(at)gmail.com (semihoksay(at)gmail.com)>

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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.

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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?

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Thanks in advance for any advice.

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Semih in Turkey

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Read this topic online here:

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http://forums.matronics.com/viewtopic.php?p=467600#467600

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Dan Helsper



Joined: 28 Dec 2016
Posts: 15

PostPosted: Sun Mar 26, 2017 2:33 am    Post subject: Magneto connection Reply with quote

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


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glen



Joined: 17 Sep 2013
Posts: 143
Location: Oregon Coast

PostPosted: Sun Mar 26, 2017 6:26 am    Post subject: Magneto connection Reply with quote

That wiring schematic is also used on the O-320 h2ad in my Skyhawks

Quote:
On Mar 25, 2017, at 3:18 PM, Jack Textor <jack(at)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(at)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
>
>
>
>
>
>
>
>
>







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taildrags



Joined: 29 Dec 2009
Posts: 1546
Location: Medford, OR

PostPosted: Sun Mar 26, 2017 10:33 am    Post subject: Magneto connection Reply with quote

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.


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oldbird



Joined: 23 Apr 2015
Posts: 91

PostPosted: Sun Mar 26, 2017 6:52 pm    Post subject: Magneto connection Reply with quote

Thank you Oscar.
I will go with the more recent configuration.
Semih​
On Sun, Mar 26, 2017 at 9:33 PM, taildrags <taildrags(at)hotmail.com (taildrags(at)hotmail.com)> wrote:
Quote:
--> Pietenpol-List message posted by: "taildrags" <taildrags(at)hotmail.com (taildrags(at)hotmail.com)>

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




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PostPosted: Sun Mar 26, 2017 8:29 pm    Post subject: Magneto connection Reply with quote

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(at)gmail.com (semihoksay(at)gmail.com)> wrote:
Quote:
Thank you Oscar.
I will go with the more recent configuration.
Semih​
On Sun, Mar 26, 2017 at 9:33 PM, taildrags <taildrags(at)hotmail.com (taildrags(at)hotmail.com)> wrote:
Quote:
--> Pietenpol-List message posted by: "taildrags" <taildrags(at)hotmail.com (taildrags(at)hotmail.com)>

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




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Semih Oksay



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