[Shotimes] What can destroy a cat?

[Leigh Smith]

What he said. As a ring wears, it may still seal well, but the gap grows,
and you get more blow-by.
There is such a thing as a gapless ring, for those racers looking for almost
zero percent leak-down.
No clue whether there is a version for our SHOs.
Lee

<SNIP>, a failing piston ring will result
> in oil being burned in the combustion chamber which
> may be closer to what you have happening in your car.
>
> Ian
> --- cmichaelo@optonline.net wrote:
> > I've heard about oil leaking into the cylinders
> > through the valve guides, but supposedly that should
> > generate a blue puff of smoke when I start the car,
> > and that I don't see.  So I can imagine that perhaps
> > oil is entering the cylinder through the cylinder
> > walls or due to a broken cylinder head gasket.
> >
> > Which one is more likely, and are there other ways
> > oil can enter the cylinders?
> >
> > Michael Olsen
> > 94MTX,green,BOS+,130k
> >
> > ----- Original Message -----
> > From: Bill Murray <fordsho@cloud9grafx.com>
> > Date: Tuesday, June 15, 2004 12:32 pm
> > Subject: RE: [Shotimes] What can destroy a cat?
> >
> > > Burning oil will also cause cats to go bad.  They
> > are not designed to
> > > burnoff the extra "stuff" that the exhaust will
> > have in it.
> > >
> > > Bill Murray
> > >
> > > > -----Original Message-----
> > > > From: cmichaelo@optonline.net
> > [cmichaelo@optonline.net]
> > > > Sent: Tuesday, June 15, 2004 11:20 AM
> > > > To: shotimes
> > > > Subject: [Shotimes] What can destroy a cat?
> > > >
> > > >
> > > > I have now destroyed my second catalytic
> > converter. I'm
> > > > trying to find out if something is wrong my
> > engine, or if the
> > > > cats were just of poor quality to begin with.
> > > >
> > > > Both cats were bought from Sho Shop in 1997.
> > > >
> > > > The first cat lasted about 40k, and the second
> > about 30k.
> > > >
> > > > I strongly suspect that the first cat died to
> > some prolonged
> > > > trouble with the MAF which produced rich fuel
> > mixture. During
> > > > the life of the first cat I only averaged 17-18
> > mpg.
> > > >
> > > > But with the second cat I had no such problem
> > with the MAF.
> > > > I'm now averaging 20-21 mpg. However, I do have
> > an excessive
> > > > oil consumption, and I'm wondering if oil is
> > leaking into the
> > > > cylinders and is burning up, if that can destroy
> > a cat?
> > > >
> > > > What else could destroy a cat?  I have 130k on
> > the car. New
> > > > oxygen sensors. New 77mm ProFlow MAF. No chip.
> > Good
> > > > acceleration.  Good idle.  Car is due for 60k
> > though.
> > > >
> > > > Michael Olsen
> > > > 94MTX,green,BOX+
> > > >
>
>
>
>
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