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EGT, CHT wires and alternator B-lead

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rvtach

Joined: 28 Jan 2008
Posts: 26
Location: Tucson, AZ

Posted: Tue May 07, 2019 8:13 pm Post subject: EGT, CHT wires and alternator B-lead

Hello all-



I am in the final throes of wiring my RV-7A and one of the last tasks is to route the CHT and EGT leads from the engine to  the firewall. My questions is- how much clearance, if any, do I need to provide between these temperature wires and the alternator B-lead? 



I made a really neat, out of the way, bundle with CHT and EGT wires and the B-lead cable (4 AWG welding cable) and then began to wonder what "noise" i might get in my engine monitor. Way easier and less frustrating to correct now if needed than later but I can't find any guidance in the Connection book or in the Matronics archives. 



Thank you to everyone on this list. I really appreciate all the education I've gotten from this group over the years. 



-Jim

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_________________
Jim McChesney
Tucson, AZ
RV-7A Flying

web(at)79ft.net
Guest

Posted: Wed May 08, 2019 11:07 am Post subject: EGT, CHT wires and alternator B-lead

... I know this ain't helping _much_ but when I installed a CGR30P on my Cheetah, I did not notice the note to _not_ run probes along the ignition wires, and did so. You can look at the pictures here: http://79ft.net/entries/misccheetah-cgr-30/. No problems. I asked EI and they said "boo, but keep it - it worked for years for you after all".Â 



On my current plane with Gem G2; I think the wires were ran along the B-lead. I'll double check later today. Regardless, I haven't heard of issues from the gentleman who installed it and flown with it for years. I will confirm where the wires run later tonight and reply along with a pic or three.Â 



Fedor 'Fidot' Fomichev.Â 

Chickenhouse Charger

http://79ft.net

 

 ----

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nuckolls.bob(at)aeroelect
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Posted: Wed May 08, 2019 1:00 pm Post subject: EGT, CHT wires and alternator B-lead

At 11:13 PM 5/7/2019, you wrote:

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



 Hello all-



 I am in the final throes of wiring my RV-7A and one of the last tasks is to route the CHT and EGT leads from the engine to  the firewall. My questions is- how much clearance, if any, do I need to provide between these temperature wires and the alternator B-lead? 	


   None.  This presumes that there are no

   installation instructions for your instrumentation

   recommending such separation.  If instructions DO

   call for separation, I would see if you can get

   you money back on it and purchase a system

   designed to work in aircraft (or any other

   vehicle for that matter!).



 

  	  Quote: 	
		  I made a really neat, out of the way, bundle with CHT and EGT wires and the B-lead cable (4 AWG welding cable) and then began to wonder what "noise" i might get in my engine monitor. Way easier and less frustrating to correct now if needed than later but I can't find any guidance in the Connection book or in the Matronics archives. 



 Thank you to everyone on this list. I really appreciate all the education I've gotten from this group over the years. 	


   I'm pleased that you've benefited from

   your participation here . . . spread the

   word . . . share your own knowledge and

   help promote the List. Nothing suppresses

   the value of knowledge more than a failure

   to skillfully exploit it.



 

   Bob . . .

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed May 08, 2019 1:05 pm Post subject: EGT, CHT wires and alternator B-lead

At 02:06 PM 5/8/2019, you wrote:

  	  Quote: 	
		  ... I know this ain't helping _much_ but when I installed a CGR30P on my Cheetah, I did not notice the note to _not_ run probes along the ignition wires, and did so. You can look at the pictures here:  http://79ft.net/entries/misccheetah-cgr-30/. No problems. I asked EI and they said "boo, but keep it - it worked for years for you after all".Â 



 On my current plane with Gem G2; I think the wires were ran along the B-lead. I'll double check later today. Regardless, I haven't heard of issues from the gentleman who installed it and flown with it for years. I will confirm where the wires run later tonight and reply along with a pic or three.Â 

  	  Quote: 	
		  	
	
 

   Actually a big help. The dreaded stresses

   conducted along such wires are really easy

   to accommodate in the design of engine

   instrumentation . . . because if they

   couple from one wire to another, the

   coupling is weak. Further the electro-

   magnetic spectrum of such noises are

   far outside the signals of interest

   coming in from engine sensors. Standing

   them off with a bit of simple filtering

   is a trivial task.



   Your experience shared supports this

   notion.



 

 

   Bob . . .

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