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Engine Bay wiring

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Fergus Kyle

Joined: 03 Jun 2007
Posts: 291
Location: Burlington ON Canada

Posted: Thu Jan 24, 2008 10:37 am Post subject: Engine Bay wiring

Cheers,

	To save complexity (?), I bought 6 x #22 cable to satisfy the number

of sensor needs from the engine to the instrum panel and proceeded to hook

up the requisite items.

	A flash from the ether told me that perhaps the cable would not

survive the heat experienced in various upper reaches of the engine bay -

which, if memory serves (heh,heh) ranges up to about 200deg Fahrenheit I

hope on a long taxying-in.

If any one has corrections to the above I'd appreciate it.

	I then searched the cable and found "60C" which I think means its

max temp parameter, so I put a sample in the toaster-oven and set 100degC.

	Ten minutes later, I vented the kitchen to the -10degC outdoors, set

the oven fan to max and in about 30 minutes had hidden the smoke from my

shortly-returning spouse - and then extricated the tiny black worm from the

pie pan [I intend to replace].

The kitchen was warm before she came in.

	I can find a replacement for the cable which says "90C". Can I use

this for the Europa purpose outlined above? I can't find the FAA criteria

under the usual terms.

	Your good offices in this touchy matter are greatfully accepted.

Happy landings, 

Ferg (smoky)

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Gilles.Thesee(at)ac-greno
Guest

Posted: Thu Jan 24, 2008 10:55 am Post subject: Engine Bay wiring

Fergus Kyle a écrit :

 	  Quote: 	
		   I can find a replacement for the cable which says "90C". 


	


Ferg,



If you happen to use a 914 engine, remember that *much* heat is 

generated under the cowl.

Even with a correctlly cowled non-turbo engine, temperatures well in 

excess of 100 C can be reached at some places. By "correctly cowled "I 

mean "tightly cowled", as should be any slick aircraft engine.



I personnally would not use anything but Tefzel in the engine bay. Max 

temperature is 150 C. As the different sensors are in different places, 

no problem with neatly bundling up the individual wires from the engine 

up to the firewall. Do not use ordinary Ti-wraps, though.



Best regards,

-- 

Gilles Thesee

http://contrails.free.fr

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Thu Jan 24, 2008 11:00 am Post subject: Re: Engine Bay wiring

Hi Ferg,



This is what they make Tefzel and its more recent cousins for.



A great place for aerospace wire is http://www.skycraftsurplus.com/

A great place to visit!!  Their website does not display wire well,

but they have loads of stock, nearly anything you might require,

and ... at 5-10 cents on the dollar retail!

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_________________
Ira N224XS

josok-e(at)ukolo.fi
Guest

Posted: Thu Jan 24, 2008 12:51 pm Post subject: Engine Bay wiring

Hi Ferg,



Out of interest i added a temp sensor in the cable form on top of the engine. This is a 914 with shroud. All gillls closed. Normally this sensor indicates about 40 C max, during taxi as well as flight. Only after the engine has been shut down, the temperature goes higher. Opening the inspection covers helps. Next thing to try in Summer is to cover the standard eyes in front of the cowling. They would make nice places for lights. Second thought is, that i would never accept anything but aircraft grade wiring, not even in other places as under the cowling. 



Regards,



Jos

Visit -  www.EuropaOwners.org

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europa flugzeug fabrik

Joined: 13 Feb 2006
Posts: 65
Location: North Coast, USA

Posted: Thu Jan 24, 2008 7:01 pm Post subject: Re: Engine Bay wiring

Ferg, why y'all usin' #22 wire in a vibrating environment?  Without special care in terminating the wires, they can eventually fracture.  I don't think I've seen a production A/C with #22.  They use #20 for small currents, no matter how small.



Fred F.

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josok-e(at)ukolo.fi
Guest

Posted: Fri Jan 25, 2008 3:58 am Post subject: Engine Bay wiring

Hi Fred,



Would it not be a good idea to -always- take special care at the termination points? A good rule is, that if the copper can move at it's attachment point it needs reinforcement, whatever gauge. 



Regards,



Jos

Visit -  www.EuropaOwners.org

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rampil

Joined: 04 May 2007
Posts: 870

Posted: Fri Jan 25, 2008 5:53 am Post subject: Re: Engine Bay wiring

Hi Fred F,



Ferg originally said he was using 6 conductor cable.  That would mitigate

the vibration flexing from your otherwise very good point.

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_________________
Ira N224XS

hdwysong(at)gmail.com
Guest

Posted: Fri Jan 25, 2008 9:51 am Post subject: Engine Bay wiring

 	  Quote: 	
		  Ferg, why y'all usin' #22 wire in a vibrating environment?  Without special care 

in terminating the wires, they can eventually fracture.  I don't think I've

seen a production A/C with #22.  They use #20 for small currents, no matter how

small.

	




Ferg almost burns his house down by cooking wire in a toaster oven and you want him to start worrying about wire gauge!?   



Seriously, a long glance behind any modern panel (especially those with glass) will reveal a host of 22 AWG wires or smaller.  There is absolutely no written/unwritten rule about using a minimum of 20 AWG.



 The panacea here is good workmanship (e.g. - proper strain relief, proper support at regular intervals, proper service loops, etc.), NOT bigger wires.  Proper workmanship also includes selecting wire rated for the environment, so stick with the Tefzel, Ferg! 



See chapter 11 of AC 43.13 for suggestions on the rest  (free PDF available here:  http://tinyurl.com/ynopgy).



D

  [quote][b]

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europa flugzeug fabrik

Joined: 13 Feb 2006
Posts: 65
Location: North Coast, USA

Posted: Fri Jan 25, 2008 2:47 pm Post subject: Re: Engine Bay wiring

 	  rampil wrote: 	
		  Ferg originally said he was using 6 conductor cable.  That would mitigate the vibration flexing from your otherwise very good point. 	




Yes, but I'm picturing the connections to the individual engine sensors.  #22 behind the panel inside the plane is OK, if the wire ends at the instrument connectors are properly dressed and/or secured.



Fred F.

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