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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