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mark.bitterlich(at)navy.m
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 Posted: Tue Feb 20, 2018 8:32 am Post subject: [Non-DoD Source] Re: Re: Engine stumble in flight |
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There is no question that this is correct. Jan Mevis and I talked about this quite extensively. Something that further points to this is an experience I had where the internal gearing in the mag housing went bad causing the right mag to come out of time, in a rather extreme way. The engine just stopped running. Cold stone dead. The guy in formation with me thought that he saw flames coming out the exhaust, but was not sure, as there was also lots of smoke. In any case, I switched to left only mag, and the engine immediately started running again, perfectly in fact. When I went to both or right mag, the engine just stopped dead in its tracks. So it is a proven fact that with the mag firing the plugs at the wrong time, it can actually stop the engine from running.
Mark
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mark.bitterlich(at)navy.m
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| Posted: Tue Feb 20, 2018 8:47 am Post subject: [Non-DoD Source] Re: Re: Engine stumble in flight |
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No John. When the coil breaks down with temperature, it is bad. As far as drilling holes in the mag .... I am not sure how effective that would be for cooling. The problem is that a coil operated in the way this one is, generates a lot of heat itself... it is not really outside temperature that is the main factor, it is core temperature that breaks down the insulation/varnish. That being said, drilling a hole would be a very effective way to allow the RF energy inside of the mag to get out resulting in additional radio noise.
Mark
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wlannon(at)shaw.ca
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| Posted: Tue Feb 20, 2018 10:38 am Post subject: [Non-DoD Source] Re: Re: Engine stumble in flight |
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Thanks Mark, George and Jan! Now makes perfect sense.
Has anyone looked at the possibility of adapting these mags to accept an
available external coil assy.? Bendix, Slick or?
Walt
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n13472(at)aol.com
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| Posted: Tue Feb 20, 2018 11:06 am Post subject: [Non-DoD Source] Re: Re: Engine stumble in flight |
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I would think you would have to make them into a low tension type first
then add the external coil.
Tom Elliott
CJ-6A NX63727
777 Quartz Ave
PMB 7004
Sandy Valley NV.
89019
Cell 541-297-5497
N13472(at)AOL.COM
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mark.bitterlich(at)navy.m
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| Posted: Tue Feb 20, 2018 1:06 pm Post subject: [Non-DoD Source] Re: Re: Engine stumble in flight |
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This is called: "Mark Bitterlich's design to adapt an MSD Ignition system to an M-14 magneto"
I believe Craig Payne took that design modified it a tad and then ran with it, which I offered to everyone on this list some years ago. He did come up with a pretty slick mag cap to go with it. Basically it uses an MSD-6 series controller, with an external coil, and then runs the high voltage right back into the mag and up to the cap. The down side of the design is that it requires aircraft power to run it, either from the battery or generator. It is not "stand alone" like a true mag is.
Mark
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pfstelwagon(at)earthlink.
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| Posted: Tue Feb 20, 2018 8:20 pm Post subject: [Non-DoD Source] Re: Re: Engine stumble in flight |
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Remember the early radials used a low tension system with external coils. Look at the cars today, coils at the spark plug. That would be a mess of coils with 18 of them.
Frank N23021
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wlannon(at)shaw.ca
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| Posted: Tue Feb 20, 2018 9:18 pm Post subject: [Non-DoD Source] Re: Re: Engine stumble in flight |
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Very true Frank but as far as I know was limited to the large radials in
high altitude, long range, aircraft.
The P&W R2800 had 36 coils and the R4360 had 56!
Did not know it was used in cars now. Probably more expensive ones than
mine.
Walt
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pfstelwagon(at)earthlink.
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| Posted: Tue Feb 20, 2018 11:27 pm Post subject: [Non-DoD Source] Re: Re: Engine stumble in flight |
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Walt, I had an A&P instructor that discussed the 4360 pointing out that it was a nightmare to work on. Hunting for a cold cylinder was hard as by the time you got the baffling off to the point where you could get to the cylinders they were all cold. Hard to think about 56 coils and plugs, tough to find a bad one!
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