Actually, it injected the air downstream some in the exhaust manifold, not near
the exhaust valves(1976 era Fords anyway). The purpose was to mix some air
into the exhaust for more complete combustion of the exhaust gasses in the
catalytic converter.
-------Original Message-------
From: JIM VANCE <va...@claflinwildcats.com>
Sent: 05/09/03 08:14 AM
To: krnet <kr...@mylist.net>
Subject: KR>Smog pumps
>
> The smog pump was actually an air pump. The air was injected at the outlet
of the exhaust valves to assure that there was plenty of oxygen to burn
any carbon that came out of the cylinders. This was the 1970's way to reduce
carbon monoxide emissions from the engines. It worked fairly well,
although I'm sure blowing cold air on the valve stems could warp them and
increase
the amount of deposits that would build up.
Once computer controlled injection systems, variable electronic timing,
and oxygen sensors in the exhaust sytem were invented, the engine builders
used fuel/air/ignition management to minimize emissions. Then the air pump
went the way of the running board.
Jim Vance
va...@claflinwildcats.com
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