I hear you on the turbo support point.  A lot depends on how the
   traction
   box is connected to it.  Mechanically the traction drive can support the
   weight of the turbo and I would prefer to have a cooling water chamber
   between the two of them. The trickiest design point and another
   reason why
   free moving exhaust pipes won't work is the  connection of the traction
   drive/ turbine to (in my case) the  drive shaft before the PSRU. It will
   have to be a robust stable mount and I can't afford to have much
   expansion
   and movement on the hot exhaust side unless it is a predictable linear
   outwards movement. I am betting the 5 inch??? pipe manifold will
   expand in
   diameter slightly and perhaps the short rectangular inlet pipes in
   length
   somewhat.

   I have a rough Rhino illustration of the whole engine set-up now but
   give me
   a few days to brush it up and add the P. Port intake manifold and
   turbo/traction drive  mount so I can receive some critique on the
   different
   aspects.

   I understand now a central through air tube is not needed. Perhaps some
   between what Tom and Ian made.

   Thanks for your input.

   DougFir

Doug,
Most steel expands at 3.0 x 10 -6 per unit per degree. Or more simply a
10 inch length would expand .05 inches at 1700°F. This will certainly
cause stress in a welded assembly but really isn't that bad. I'd have to
look up inconel. You are correct that any heat loss in the manifold
would lessen the energy available for the turbo compound process.
Bill J.


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