Anybody ever tried this little gizmo?

Bewy said

I am surprised nobody sees a major problem with the acc pump nozzle plate. It will affect distribution. Many production carbs had snivvies riveted to the booster to direct [ or re-direct more correctly ] airflow. These were muuuuuuuuuuch smaller than the 'plate', so goodness knows had bad that plate will affect flow/distribution. It also takes up quite a bit of area, so one would expect total airflow to be reduced, apart from the re-direction.
On well designed carbs, the acc pump squirt is aimed at the booster purposely to break up the flow....& atomise it.

However the above 'gadget' was designed & used by Carter decades ago.
Look closely at the pump nozzle on a CS TQ & the AVS Carter carbs used on Mopars. There is an air break in the pump nozzle that drags air with the pump shot to atomise the squirt.

Bottom line: something so simple & cheap would be in widespread use...if it actually worked.

Click to expand...

You're sort of making the assumption that fuel is already distributed evenly without the plate. In some applications where the fuel is not distributed evenly (as is often the case in a dual plane manifold) there is the outside chance that the plate could actually improve fuel distribution.
When I tested the plate on the dyno I saw a loss in power. I attributed the power loss to a loss in airflow caused by the plate hanging over the venturi. I could be wrong about that. If I recall correctly it didn't change the air fuel ratio as read by the airflow and fuel meters or the o2 sensors in each header collector. The individual cylinder temps didn't change significantly either. Cylinder temps can be a somewhat reliable indication of fuel distribution but not gospel.
The plate did cover up a noticeable hesitation on quick throttle opening. I was able to cover up the same problem by increasing the accelerator nozzle size without the plate and without the power loss caused by the plate.
The plate was able to cover up the same hesitation with a smaller nozzle size. I suppose that could means it does it with less fuel. I can't confirm that for sure.
I might consider it in an application where I had a hesitation and traditional means to fix it weren't getting the job done. Or maybe in an effort to get maximum fuel economy. Never say never.