John Twist wrote an article some years ago, in either MGB Driver or the
AMGB magazine, in which he related his testing of power output both with
and w/o the air pump, on one car. His conclusion was that there was a
gain of 1 hp or so at certain engine speeds. He didn't advocate that
we all rush out to reinstall the air pumps, but pointed out that there is
not necessarily a loss in power with the things installed.
Bob
On Sun, 02 Oct 2005 12:23:06 -0600 "Andrew B. Lundgren"
<lundgren@byu.net> writes:
> Some power is required to pump air into the exhaust system. There is
>
> nothing in the exhaust that would be able to create additional power
>
> from the air, so there can be now power benefit from it.
>
> David Breneman wrote:
>
> >Poorer performance with the air pump? I've always heard that
> >the air pump was neutral, or might have actually bumped up
> >horsepower by a tiny amount. But I've never heard that it
> >resulted in *poorer* performance.
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