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Re: Exhaust

-----Original Message-----
From: Eyvind Spangen <eyvind.spangen@ha-nett.no>
To: dendrite@sbt.infi.net <dendrite@sbt.infi.net>
Cc: quattro@coimbra.ans.net <quattro@coimbra.ans.net>
Date: Sunday, September 13, 1998 4:14 PM
Subject: Re: Exhaust

>That is normal on cars with catalytic converters..
>The rotten egg smell is sulphur dioxide (?)


    Actually, the rotten egg smell is hydrogen sulphide (H2S), generated
from sulphur in a reducing ( oxygen deficient) atmosphere . Sulphur dioxide
(SO2) is the product of complete oxidation of sulphur. Hydrogen sulphide is
detectable by the human nose at very low concentrations (2-3 parts per
billion), and is readily noticed - probably an evolutionary development to
prevent us from eating rotten food - at least I assume that's why our nose
is hung over our mouth :o)

Fred Munro
'91 200q  257k km