Re: VW cats, looks like a good deal.

[David Liu <dyliu@pacbell.net>]

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back when i was at school, we were working on a hybrid-electric vehicle and 
we installed a pre-heated cat. i don't remember the numbers, but this was 
great for reducing the initial cold-cat problem.
dave

At 02:52 PM 11/17/99 -0700, Night Shadow wrote:


>On Wed, 17 Nov 1999, Ian Overholt wrote:
>
> > The 16v Oxy sensor is mounted on the cat.  I'm not sure, but I think the
> > heater might actually be there to heat up the cat.  You know, all the 
> newest
> > emissions equipment is only trying to get the exhaust temps up quicker.
> > Once the cat is hot, the car doesn't really make any more 
> pollution.  In the
> > first 12 seconds of operation, the car makes all the pollution it is going
> > to make.  WOT operation of course makes this statement untrue.
> >
> > Ian Overholt
>
>Sorry to say, but that is a false statement.  The catalytic converter is
>one of the worst ideas in automotive history, at least in it's current
>form.  The catalytic converter doesn't reach operating temperatures and
>proper efficiency until an average of 10 miles of driving!  During this
>time, the catalytic converter pumps out tons of Nitrous Oxide (N2O).
>Nitrous Oxide is one of the nastys in the greenhouse gas realm.  (Trust me
>on this, just got done with a 14 page paper on the subject, using all the
>latest findings and research, even the EPA has admitted this fact).
>Another interesting item: Catalytic Converters have about 3 grams of heavy
>metals in them (platinum, rohdium, palladium), to get these 3 grams of
>metal for ONE coverter, a processing plant dumps 24 LBS! of Sulfur Dioxide
>into the atmosphere.  Lovely eh?  And some research being done in
>Austrailia shows some promise, but have found another nasty thing about
>cats, they emit Isocyanic Acids into the air as well, which are attributed
>with long term lung damage! LOVELY!
>
>Eric
>(hollow cat for emissions test, which it passes perfectly, no cat the rest
>of the time)
>
>
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