From: jab@netrix.com
You will probably have to run the carbs leaner if you have to pass
a tailpipe sniffer test. This is due to the fact that the exhaust
will not be diluted by the air pump.
Just to maybe stave off a bit of confusion here - the air pump does
not "dilute" the exhaust. It adds fresh air to the exhaust, which
provides the oxygen needed for the remaining unburned hydrocarbons and
carbon monoxide to get converted to water and carbon dioxide (perhaps
with the help of a catalytic converter). In other words, the pump is
there to enable a real (and effective) chemical reaction, not just a
dilution.
-john
John Wroclawski
jtw@lcs.mit.edu
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