You may get some responses from folks who say they replaced the SUs
with a Weber and the car runs better than it ever has. What they don't
say is that they replaced a worn out, leaking, badly adjusted, dirty and
neglected carb with a shiny new Weber out of the box. Of course it
ran better!
Replacing that worn out, leaking, etc. carb with a shiny, clean, well
rebuilt and properly adjusted SU would also make the car run better
than it ever has, without having the drawback of putting a 90 degree
turn in the path to the intake ports.
Webers, both the downdraft DG and the sidedraft DCO series do
have an accelerator pump which can give a slightly quicker throttle
response compared to the constant depression style of enrichment
of the SUs. But with two equal cars with equally strong engines
and well tuned carbs, you'd not likely notice any real difference
between a Weber and SUs.
There's a lot of comparing apples to lipstick when it comes
to carbs on our old British machinery.
mjb.
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