Quote:
Originally Posted by Heihetech
I don't think so. Oxygen will not kill the cat, no harm done. Just think when
you release gas padel during cruise speed on general vehicles, fuel will be cut
out, pure air instead of exhaust will be blowed onto the cat. Such case
happens frequently during normal driving, does it kill the cat? NO！So please
don't worry, oxygen will not harm the cat. Something that does harm to the
cat is un-burned HC from lean burn, which will not be involved within DCD.
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"Catalytic converters generally function efficiently only when the incoming mixture is within about 4% of stoichiometry, or a lambda range from .96 to 1.04. Let's return to our last example above. At 1.03, lambda is narrowly within acceptable lean limits. But if this borderline lean condition persists over a long period of time, the catalyst will slowly degrade as a result of the excessive heat it generates while cleaning up the exhaust stream."
From
http://www.austincc.edu/wkibbe/lambda.htm