FW: [Shotimes] looking to buy a high flow cat

[Don McKinnon (AST)]

I found some info on the net today.  The following is from a manufacturer of
automotive parts and was in a white paper on reducing the wall thickness and
improving the cat ability to do its work.  I wish "high flow" cats were of
the metallic type as the durability is greatly improved as the substrate can
be attached directly to the case.  The data shows that reducing the wall
thickness goes hand in hand with increasing the number of cell in an area.
Now this is just one manufacturer info, others could be doing something like
Ron stated with reducing wall thickness and not increasing the cell density,
but that seems contrary about what they would do, notice how the brick
length data is reduced with increased cell density in the ceramic substrate.
I should give another call again to Carsound and talk to them a bit about
the substrate difference between the 94xxx series and the new 53xxx series
of the 4" round cat to see what they'll say.

      Cell density-Cells per inch2 400 400 600 600 900 800
      Wall thickness (in) 0.0065 0.0045 0.0043 0.0035 0.0025 0.0016
      Substrate material ceramic ceramic ceramic ceramic ceramic metallic
      Channel shape square square square square square triangular
      Cross section (cm2) 81.07 81.07 81.07 81.07 81.01 81.07
      Brick length (mm) 100 99.96 66.79 66.78 44.65 48.11
      Brick mass (kg) 0.5888 0.4732 0.4107 0.3723 0.2991 0.4847
      Backpressure (kpa) 5.97 4.93 5.69 5.16 5.51 5.46
      Conversion ability2 3.42 3.42 3.42 3.42 3.42 3.42
      Volume (L) 0.8107 0.8104 0.5415 0.5414 0.362 0.3901


Don McKinnon
95 MTX - White/Mocha 89k miles
Stage 1 Power Package with Stage 1cams
Canyon Carver Road/Race Suspension
Quaife & HiRevs Competition Clutch
   -----Original Message-----
  From: shotimes-admin@autox.team.net
  [mailto:shotimes-admin@autox.team.net]On Behalf Of D Potter
  Sent: Wednesday, December 11, 2002 5:15 PM
  To: shotimes@autox.team.net
  Subject: Re: [Shotimes] looking to buy a high flow cat


  I mentioned this before, but no one actually looked into the round cats to
  see if it was an issue. The width of the walls of the catalyst have a
  profound effect on how much flow you will get per square inch of catalyst
  frontal area. Catalyst mfg's are always seeking to reduce both the width
of
  the catalyst walls as well as the flow chambers to improve efficiency. If
  the round cats have significantly smaller walls with similar size flow
  chambers compared to the oval cats that were being used, then the flow
rate
  of the unit could be better even in a smaller size. Also, the smaller, and
  more equally transition areas into and out of the cat on the round units
  decrease turbulence, which will improve flow. Mine are marked "Katco".
Maybe
  someone would be interested in locating this mfg and asking them?

  Macho, macho man...      er...


  ----- Original Message -----
  From: <Rbade12@aol.com>
  To: <1badsho@thenuthouse.com>; <shotimes@autox.team.net>
  Sent: Tuesday, December 10, 2002 4:01 PM
  Subject: Re: [Shotimes] looking to buy a high flow cat


  > > Anyone on the list have  high flow cats preferably from Performance
Plus
  for
  > > sale ?
  > >
  >
  > Try <A HREF="www.discountconverter.com">www.discountconverter.com</A>
  >
  > I've had with friends, and I recall this list having, discussions about
  > wether there is such a thing as a "high flow cat". Seems to me, to do
  their
  > job they have to be restrictive. Can some of that restriction be
  engineered
  > out to allow higher flow yet still allow them to do their job? If that
  were
  > the case I'd think all cats would be manufactured high flow for no other
  > reason than having to put less stuff inside them, therefore reducing
  > manufacturing costs.
  >
  > Does anyone have definitive high flow vs regular flow data?
  >
  > Bob 93 MTX    PP Y-pipe with "high flow cats"
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