Quote:
Originally Posted by Jac Mac
The purpose of those holes is to reduce the tendency for fuel to be pulled from the main venturi under idle conditions when using a longer duration cam etc that needs a wider throttle plate setting to maintain a decent idle speed, the holes kill off airflow between the throttle plate & main venturi, many production carbs- carter etc particularly 2bbl's use the same trick. Not a really good idea when you think of the crap that can get drawn in at that point. The introduction of 'idle-ezi' by Demon & others gets around the problem and at least keeps the air cleaner.
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That doesn't make any sense to me whatsoever I'm afraid. There is no pressure difference from one side of the hole to the other, which will always be roughly at atmospheric pressure, unless it is a blow-through supercharged/turbo application.