Tom why the radius on the Teflon holes?
I can see two drawbacks. One the Teflon connection between
sections is not as strong. Two when the slide is WOT there
will be more of a discontinuity around the slide.
WOT is the conditions most AC engines run at over 8,000
feet altitude.

Paul Lamar

Paul,
I was under the impression that the turbulent flow at low rpm may be a factor.  If thats not the case then thats one less thing someone will have to do.  I agree the cross sectional area is thin if you radius the slide and may not be sufficient in a slam close situation.  I'll change the drawing to reflect that.  I've already changed the diameter of the slide holes to 1.625".  On a side note the best cost number so far for the spacer is $22.06 each.  I'm still requesting quotes.  I'm also looking into the hand manufacturing as an option.  T.W.


The holes in the Teflon should be 1.875". Two inch OD tube .065 wall
2.000 - .125 = 1.875.

$22 is not too bad. The material alone at $4 a pound would be about $5.25
not counting the scrap value.

Four large holes in the four corners and a jig saw would do the trick.
Also if  you have a big band saw with a blade welder that would also
work for a stack of five or ten at a time and be faster than a jig saw
doing one at a time.

Paul Lamar


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