cat...

[Shannen Durphey]

Couple of things.  It takes a bunch of driving with a red
cat to burn it up.  If it glows some and you catch it, you
can save it.  Also, I'm talking about a bunch of HC, like
two cylinders out of 6 misfiring.  And, combined with that,
it usually requires higher rpm than idle.  We don't have
emissions tests here, so I don't see any numbers to
correspond to this, but if the exhaust burns your nose and
eyes, it's rich enough to cause problems.  Sorry, wish I had
some concrete numbers for you.

Shannen

Kevin Vannorsdel wrote:
> 
>  Shannen,
> 
> Any idea how to find out if the mixture is such that the cat will glow red and
> burn up.... before it glows red and burns up?  Is this something that the
> manufacturors spec I wonder?  Maybe I'll do some more lookin'
> 
> ________________________________________________
>   Kevin Vannorsdel     IBM Arm Electronics Development
>     408-256-6492                Tie 276-6492     kv at us.ibm.com
> 
> owner-diy_efi at efi332.eng.ohio-state.edu on 08/18/98 12:33:02 PM
> Please respond to diy_efi at efi332.eng.ohio-state.edu
> To: diy_efi at efi332.eng.ohio-state.edu
> cc:
> Subject: Re: carprom software
> 
> peter paul fenske wrote:
> >
> > Hi Kevin
> > Oddly I have found fuel leaking into
> > cat doesn't faze it.
> >
> > I believe with no O2 content there is no
> > burning in the kat.
> >
> > However Cats only work around STOICH.
> > So if you are running a rich AFR they
> > do nothing.
> >
> Well, not quite.  A good cat will get a nice, reddish glow.
> Then they usually start going bad.
> 
> Shannen
> 
> > Make sure you are working around 14.7 to 1
> >
> > :peter
> >
> > Ps what was your application and cal
> >
> > At 11:08 AM 8/18/98 -0400, you wrote:
> > >
> > > Anyone have any experience with how much a good catalytic convertor will
> > reduce
> > >exhaust HC numbers?
> > >
> > >Also-  I assume that too much HC will cause pre-mature cat failure...  don't
> > >want that either.  Any comments on this?
> > >
> > >I currently am at 1300PPM  HC at idle and need to get down to 150 or so to
> > pass
> > >emissions.   Some more chip work is sure to help but curious to check if
> > anyone
> > >had any comments about the cat effictiveness/failure.
> > >
> > >Thanks!!
> > >
> > >________________________________________________
> > >  Kevin Vannorsdel     IBM Arm Electronics Development
> > >    408-256-6492                Tie 276-6492     kv at us.ibm.com
> > >
> > >