---------------------------------------------------------- Pietenpol-List Digest Archive --- Total Messages Posted Sun 03/26/17: 5 ---------------------------------------------------------- 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 _____________________________________ Time: 03:33:26 AM PST US From: helspersew@aol.com Subject: Re: Pietenpol-List: 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 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 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 _____________________________________ Time: 07:26:42 AM PST US From: Glen Schweizer Subject: Re: Pietenpol-List: 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 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 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 _____________________________________ Time: 11:33:44 AM PST US Subject: Pietenpol-List: Re: Magneto connection From: "taildrags" 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 _____________________________________ Time: 07:52:15 PM PST US From: Semih Oksay Subject: Re: Pietenpol-List: 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 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 _____________________________________ Time: 09:29:43 PM PST US From: Steven Dortch Subject: Re: Pietenpol-List: 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" wrote: > Thank you Oscar. > > I will go with the more recent configuration. > > Semih=8B > > On Sun, Mar 26, 2017 at 9:33 PM, taildrags 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 >> >> >> >> >> >> >> ======================== =========== >> br> enpol-List" target="_blank" rel="noreferrer">http://www. >> matronics.com/Navigator?Pietenpol-List >> ======================== =========== >> FORUMS - >> _blank" rel="noreferrer">http://forums.matronics.com >> ======================== =========== >> WIKI - >> lank" rel="noreferrer">http://wiki.matronics.com >> ======================== =========== >> b Site - >> -Matt Dralle, List Admin. >> target="_blank" rel="noreferrer">http://www.matronics.com/contributi on >> ======================== =========== >> >> >> >> > > > -- > Semih Oksay > ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message pietenpol-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/Pietenpol-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/pietenpol-list Browse Digests http://www.matronics.com/digest/pietenpol-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.