cat...

[Shannen Durphey]

Shannen Durphey wrote:
> 
> 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
> 
Hmmm.  Sorry.  A misfire shows excessive HC (and burns the
nose), but also has excesses of O2 to react with in the
cat.  Extremely rich exhaust creates sulfur smell, but I've 
never noticed a glow from them. 

Got to retain my membership in CSH club.
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
> > > >
> > > >