George Lendich wrote:

Paul,
I have been having a hell of a time trying to get some tubes the right size and bent to accommodate the inlet manifold.

I thought a square or rectangular tube would be OK. I could laser cut the side wall and weld on the top and bottom with flat and do the plenum the same.

I'm sure square isn't the optimum but maybe the second best alternative.

Playing around with tube and plenum design, I came up with this idea - see attached drawing, and wondered if it would have some merit for installation that have no over engine access for inlet
manifolds. It is basically a box with the inlet access returned back upon itself - within the box. The dotted line is the centre line.

This is the early stage of design and I'm sure there is some eddy/drag problems, but I'm open to any/all suggestions!
George ( down under)

I think round composite would be better than square metal. You get a lot of internal skin
friction drag with square tubes. Intake air velocity can be up to .4 mach.

Paul Lamar
 
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