All,
I'v never heard of an air-pump /increasing/ HP, as the parasitic
drag to run the pump with a fan belt is second only to the drag added by
a water pump. I think the single largest drop in HP for the original
MGB 4-cylinder occurred in '68 when they added the air-pump. Many
modern cars have added electric air-pumps to avoid the parasitic drag,
although these "air-pumps" are intended to inject air into a 3-way
catalytic converter, not a closed-loop EFI system. I don't know what
the EPA's original intent was, but regardless, injecting air into
burning rich exhaust gasses /will /allow more complete combustion,
reducing hydrocarbon polutants (I don't think it does anything for NOX,
which is what the EGR was for). In theory, that could help with a
carburated and turbocharged car, but I doubt that's the case here. Of
course, with modern EFI, there is almost no unburnt fuel in the exhaust,
unless you have 70,000 miles on your O2-sensor, in which case, all bets
are off.
JJJ
Barrie Robinson wrote:
>DAvid,
>
>I am not really very familiar with the air pump set up but I assume that it
>just injects air into the exhaust. Some claim that this extra oxygen burns
>up excess fuel and renders some pollutants harmless - but I wonder! The
>original trick was to dilute the percentage of pollutants NOT decrease
>them. This because of warped govt thinking confused bulk with
>percentage! But injected air can suck exhaust out of cylinders but again
>- I wonder. Are there any reliable test results available.
>
>
>At 07:04 AM 3/24/05, you wrote:
>
>
>>I'd think twice before removing the air pump. It actually
>>not only produces a pronounced decrease in pollutants, but
>>it marginally increases horsepower as well. Not much, but
>>measurably.
>>
>>David Breneman david_breneman@yahoo.com
>>
>>
>>
>>__________________________________
>>Yahoo! Small Business - Try our new resources site!
>>http://smallbusiness.yahoo.com/resources/
>>
>>
>
>Regards
>
>Barrie Robinson
>
>MGB GT V8
>Aston Martin DB 2/4 MkII
>705-721-9060
>
>Purveyor of O-ring kits for restoring Smith & Jaeger gauges,
> Stainless steel mesh grilles, air vents & airdams and,
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