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Affixing an Engine Ground

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longg(at)pjm.com
Guest

Posted: Fri Feb 13, 2009 7:51 am Post subject: Affixing an Engine Ground

I have a new IO-360 and I am at a loss as to the best place to bolt the ground wire. Do any of you have a suggestion? A picture may be valuable here.   

   

Along the same lines, my craft is fiberglass and I am wondering if it’s smart to have two such ground running from the firewall to the engine.  

   

Thanks,  

Glenn  

      [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Sat Feb 14, 2009 4:55 am Post subject: Affixing an Engine Ground

At 09:49 AM 2/13/2009, you wrote:

 	  Quote: 	
		  I have a new IO-360 and I am at a loss as to the best place to bolt 

the ground wire. Do any of you have a suggestion? A picture may be 

valuable here.



Along the same lines, my craft is fiberglass and I am wondering if 

it's smart to have two such ground running from the firewall to the engine.


	


    One is sufficient. Assemblies on airplanes held together

    with big bolts are generally considered failure free if

    assembled per instructions.



    Even if the airplane is metal, the engine sits on

    non-conductive shock mounts. Some designers have

    called for conductive bonding straps around the

    shock mounts for the purpose of electrically

    connecting the engine to the engine mount and

    ultimately to the airframe at the firewall.

    But if you plot out all the series and paralleled

    connections in such an array of conductors, it

    becomes apparent that the most effective and

    simple process is the fat-wire or braided

    ground jumper from the crankcase to a high-quality

    ground on the firewall, i.e. forest-of-tabs

    or equal.



    I'd be pleased to have photos of good connections

    to the crankcase on various engines. I'll publish

    them on the website.

        Bob . . .



        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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