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P-leads connector

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fasilpereira

Joined: 17 Jul 2011
Posts: 86
Location: Brazil

Posted: Thu Apr 07, 2022 2:41 pm Post subject: P-leads connector

Hi,



I'm installing my engine and I like to have connectors everywhere to make it easier to remove and install the engine.



What kind of connectors would be recommended on the Mags P-leads?



I was considering a CPC or maybe a Seal-all, but since the wires are shielded, I'm not sure if connecting the shields though these connectors will be effective supressing the ignition noise.



Thank you,



Fabricio

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_________________
Fabricio Pereira
Engineer / Pilot

nuckolls.bob(at)aeroelect
Guest

Posted: Fri Apr 08, 2022 7:52 am Post subject: P-leads connector

At 05:41 PM 4/7/2022, you wrote:

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



 Hi,



 I'm installing my engine and I like to have connectors everywhere to make it easier to remove and install the engine.



 What kind of connectors would be recommended on the Mags P-leads?



 I was considering a CPC or maybe a Seal-all, but since the wires are shielded, I'm not sure if connecting the shields though these connectors will be effective supressing the ignition noise.



 Thank you,



 Fabricio 	


   Not recommended. Ignition 'noises' will not be

   materially affected by breaking the p-leads with

   a connector . . . but it DOES introduce risk

   of discontinuity by reason of 6 new joints added

   to the magneto control system. Joints that add

   very low if any utility to maintenance of the

   airplane.



   The amount of wire from firewall to rear of mags

   approaches trivial . . . easily managed during

   engine remove/replace operations.



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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fasilpereira

Joined: 17 Jul 2011
Posts: 86
Location: Brazil

Posted: Fri Apr 08, 2022 8:57 am Post subject: Re: P-leads connector

Hi Bob,



Removing/reinstalling the wires to the mags really don't bother me. I just don't like to mess with cables that are beautifully routed and properly supported.



Since my Rotax ignition system is designed that way by the airframe factory (and I really like that!), I was considering that option.



But you are right, it will affect the reliability of the system. It may not be a problem on the Rotax because it will not start if turned by hand with the ignition not grounded, but it may be risky on a conventional Magneto engine.



Thank you for the advice!



Fabricio

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_________________
Fabricio Pereira
Engineer / Pilot

skywagon185(at)gmail.com
Guest

Posted: Fri Apr 08, 2022 1:31 pm Post subject: P-leads connector

P- Leads ..... 	  Quote: 	
		  Fabricio,

Do use Bob's suggestion about using  a solid connection.

An added detail is wire it knowing that engine "Shake" is hard on the connection especially it you have used too short of a P-lead harness.  Leave it long enough to secure well but tolerate engine movement during start and stop periods.  The extra length will allow you to repair the P-lead in case future vibration breaks the lead at the mag.

D

	






On Fri, Apr 8, 2022 at 8:53 AM Robert L. Nuckolls, III <nuckolls.bob(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:



 	  Quote: 	
		    At 05:41 PM 4/7/2022, you wrote:

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



 Hi,



 I'm installing my engine and I like to have connectors everywhere to make it easier to remove and install the engine.



 What kind of connectors would be recommended on the Mags P-leads?



 I was considering a CPC or maybe a Seal-all, but since the wires are shielded, I'm not sure if connecting the shields though these connectors will be effective supressing the ignition noise.



 Thank you,



 Fabricio 	


   Not recommended. Ignition 'noises' will not be

   materially affected by breaking the p-leads with

   a connector . . . but it DOES introduce risk

   of discontinuity by reason of 6 new joints added

   to the magneto control system. Joints that add

   very low if any utility to maintenance of the

   airplane.



   The amount of wire from firewall to rear of mags

   approaches trivial . . . easily managed during

   engine remove/replace operations.



 

 

   Bob . . .



   Un impeachable logic: George Carlin asked, "If black boxes

   survive crashes, why don't they make the whole airplane

   out of that stuff?"

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donjohnston

Joined: 13 Dec 2009
Posts: 231

Posted: Sun Apr 10, 2022 8:04 am Post subject: Re: P-leads connector

Considering the number of times an engine is removed, I don't think a connector for the mags is worth it. 



Just my .02

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