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Z18 LOM Installation Question

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mike(at)vision499.com
Guest

Posted: Wed Mar 27, 2024 6:41 pm Post subject: Z18 LOM Installation Question

Hello,

 

Z18 shows a filter (F526.910-03) installed on the P lead of both mags.

I am not able to source this from LOM.

Any idea about what a local equivalent for this would be

 

Thanks

 

Mike

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user9253

Joined: 28 Mar 2008
Posts: 1908
Location: Riley TWP Michigan

Posted: Thu Mar 28, 2024 8:46 am Post subject: Re: Z18 LOM Installation Question

I am not necessarily recommending these parts that I found online.

They might or might not be a suitable replacement.

https://www.autozone.com/ignition/noise-filter/p/msd-8830-noise-filter/139779_0_0

https://www.aircraftspruce.com/catalog/elpages/lsMagFilter.php?clickkey=10123

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_________________
Joe Gores

Eric Page

Joined: 15 Feb 2017
Posts: 243

Posted: Fri Mar 29, 2024 8:34 am Post subject: Re: Z18 LOM Installation Question

That MSD noise filter is almost certainly a Nippon ChemiCon U36D series capactor (like this one) with a red shrink-wrap over it and the price wildly inflated.



Here's the mounting bracket.

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nuckolls.bob(at)aeroelect
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Posted: Fri Mar 29, 2024 8:25 pm Post subject: Z18 LOM Installation Question

At 11:34 AM 3/29/2024, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "Eric Page" <edpav8r(at)yahoo.com>



 That MSD noise filter is almost certainly a Nippon ChemiCon U36D series capactor (like this one ( https://www.digikey.com/short/52pftq70)) with a red shrink-wrap over it and the price wildly inflated.



 Here's the mounting bracket ( https://www.digikey.com/short/b3mrf2h9). 	


  I ran some tests many moons back to explore

  the benefits of fat capacitors on the output

  of any alternator but specifically the

  PM devices. Copies of exemplar plots

  are available at:



  http://aeroelectric.com/articles/Alternators/SD-8/SD8_Noise_Plots.pdf 



  Bottom line is that I could detect no benefit

  for having this capacitor in the system.

  Noise levels on the alternator's output

  were quite nominal and of no operational

  significance whether or not the capacitor

  was included.



  Except for the mitigation of generator/alternator

  radio frequency noise in ADF radios, B-lead

  capacitors and/or 'purpose designed' filters

  haven't been needed for quite some time.



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

    =================================

  

    In the interest of creative evolution

    for the-best-we-know-how-to-do based

    on physics and repeatable experiment.

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Mar 30, 2024 1:05 pm Post subject: Z18 LOM Installation Question

At 11:24 PM 3/29/2024, you wrote:

  	  Quote: 	
		  At 11:34 AM 3/29/2024, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "Eric Page" <edpav8r(at)yahoo.com>



 That MSD noise filter is almost certainly a Nippon ChemiCon U36D series capactor (like this one ( https://www.digikey.com/short/52pftq70)) with a red shrink-wrap over it and the price wildly inflated.



 Here's the mounting bracket (  https://www.digikey.com/short/b3mrf2h9). 	
 	


   AHA! you weren't talking about an alternator filter . . .

   but an ignition module filter . . . I'll learn how

   to read one of these days!



 

 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

    =================================

  

    In the interest of creative evolution

    for the-best-we-know-how-to-do based

    on physics and repeatable experiment.

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Mar 30, 2024 1:29 pm Post subject: Z18 LOM Installation Question

At 11:24 PM 3/29/2024, you wrote:

  	  Quote: 	
		  At 11:34 AM 3/29/2024, you wrote:

  	  Quote: 	
		  --> AeroElectric-List message posted by: "Eric Page" <edpav8r(at)yahoo.com>



 That MSD noise filter is almost certainly a Nippon ChemiCon U36D series capactor (like this one ( https://www.digikey.com/short/52pftq70)) with a red shrink-wrap over it and the price wildly inflated.



 Here's the mounting bracket (  https://www.digikey.com/short/b3mrf2h9). 	
 	


   Greetings from the right 'rabbit hole' . . .



   Okay, I peeked at the mounting bracket and the 36D

   series capacitors and ran down the wrong rabbit hole.



   I don't recall the source data for LOM magneto

   wiring . . . Z18 was crafted many moons ago! However,

   I'm pretty sure we're working with legacy magnetos.

   Therefore, those filters would be of the type

   recommended for magneto p-leads. These are generally

   a series inductor paired with a shunt capacitor.



   Try flying with no filters. These were generally

   needed only for low frequency AM radios. I'm

   presuming you won't have these installed!



   Wire the mag switches as shown . . . ground the

   switches through the p-lead shields with no

   other connections to ground at the switches.

   I think you have a good chance of experiencing

   no magneto interference.



   If you DO notice some on your VHF comm radios,

   we can craft some filters to try. They're 

   not complicated. But to be sure, fat

   electrolytic capacitors are not part of

   the solution! 



 

   Bob . . .



                    //// 

                   (o o) 

    ===========o00o=(_)=o00o========= 

    < Go ahead, make my day . . .   > 

    < show me where I'm wrong.      > 

    =================================

  

    In the interest of creative evolution

    for the-best-we-know-how-to-do based

    on physics and repeatable experiment.

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