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Date: Wed, 22 Aug 2007 08:44:02 -0400
From: Ernest Christley <echristley@nc.rr.com>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Tap 'em  holes  was  [FlyRotary] Throttle Body Nut
 Ideas
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Ed Anderson wrote:
> Scott,  I think the best answer is to simply tap those bolt holes for 
> the thread size of your bolts.  This does a number of things.
>
> 1.  There is nothing to fall off inside the plenum, no nuts, no bolts 
> or no nut plates
> 2.  Its a few fractions of an ounce lighter
> 3.  You never have to worry about getting onto the back side of the 
> plate (looks like you intend to weld it to the plenum tube.
> 4.  Two of your nuts are pretty close to the wall of your plenum if 
> that bright circle is indeed where it will be placed - can't tell for 
> sure but could be interference with the wall of plenum.
> 5.  You never have to worry about it again.
>
> Ed
>
>
I've been told by a machinist that tapped holes in aluminum are weak.  
Any truth to that?