[Shotimes] What can destroy a cat?

[cmichaelo@optonline.net]

Considering the car is 10y old, has 130k on it, I'm using Amsoil and that I don't race my car, is it still likely that a piston ring can wear down this fast?

----- Original Message -----
From: Leigh Smith <leighsm@comcast.net>
Date: Thursday, June 17, 2004 4:31 pm
Subject: Re: RE: [Shotimes] What can destroy a cat?

> 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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