Quote:
Originally Posted by David Ray
Ported vacuum is NEVER sourced below the throttle blades, it is ALWAYS sourced at the smallest diameter of the bore venturii, that is why, as the air flow is high there when the throttle is full open, vacuum is significantly higher there, than at or below the throttle plates.
Connect two vacuum gauges and go drive the engine around, full throttle it, idle it, and then, cruise, mild acceleration, all facets of operation. You will get the correct picture then.
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Like i wrote, ported vacuum IS sourced from below the throttle blade, AT ACCELERATION.
You obviously haven´t looked into the bores of a carburetor with a ported source for the vacuum advance (load compensator, as you state it sits in the smallest diameter of the venturi.
NO PORTED SOURCE FOR ANY VACUUM ADVANCE IN ANY CARBURETOR SITS IN THE SMALLEST DIAMETER OF THE VENTURI, PERIOD.
The only carbs using venturi vacuum is HOLLEY´s with vacuum operated secondary valves.