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RE: Smog and Engine Size Question

To: mgs@autox.team.net
Subject: RE: Smog and Engine Size Question
From: "A. B. Bonds" <ab@vuse.vanderbilt.edu>
Date: 21 Aug 1996 09:14:39 -0500
In <199608210212.WAA15454@mh004.infi.net>, Ed Taylor wrote:

>Which leads us to a discussion of the wonderful AIR PUMP, which was
>one way of beating the emissions guidelines without doing a thing to
>actually clean up the emissions from the engine.  The air pump simply
>injects air into the exhaust gasses, thus reducing the ppm of pollutants
>without actually reducing the volume of pollutants.  The same amount
>of hydrocarbons, CO, etc., are still present at the exhaust, there is
>just more air for them to be measured as a part of!! 

Actually, no.  The notion of the air pump is that the fresh air
injected in the hot exhaust flow helps to support post-combustion of
incompletely burned hydrocarbons.  It does more than simply dilute the
flow.  In order to get a meaningful reduction of HC percentages by
dilution, the air pump would have to be enormous.
>
>But try to explain this to your local smog guy. He'll still throw the
>book at you if you don't have the air pump.  Oh well...
>
Quite correctly, depending on local smog ordinances.
                        A. B. Bonds


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