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Re: The Rapp on exhaust

LToy@aol.com sez:
> seems to me that if this really were a low cost way to efficient power, the
> factory would have done this.

It is not at all low cost -- that's the common fallacy!  In order to use a
wrapped exhaust system, you really have to have an exhaust system fabbed from
321 stainless, or Ti.  This is seriously expensive!  Anything, and I do mean
anything, less will crack, distort, fall apart, etc.

As far as performance gains go, the real gains are going to be pre-turbo
insulation -- that is where the delta-t is at a max, so the potential for
heat loss (and corresponding drop in gas velocity) is greatest.

fhd@interport.net | Very often, a considerable lack of understanding is
  1 212 559 5534  | apparent between `mathematicians' and `engineers.'
  1 917 992 2248  | ... only a few men can master both theoretical
  1 718 746 7061  | research and practical application.	-- S. F. Hoerner