Javier,
By their design, Stromburgs work best at around 2.5 pounds fuel
pressure. Forcing more fuel into the float bowls has absolutely no effect on
horsepower, as the carburetors are meant to deliver approximately a 14:1
air/fuel ratio to your engine, and a richer or leaner mixture means less
power. The original mechanical pump uses negligible power...probably not
enough loss to be seen on an engine dynamometer and certainly not enough to
be seen on a chassis dynamometer.
Jim Leach Pacific Tiger Club Seattle
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