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Last year, I installed a Volvo throttle plate (that had this wedge) into the throttle body of the gasoline engine of my Dakota. The Volvo and the original throttle plates had the same diameters, but I had to drill out a couple of holes in the Volvo plate in order for it to bolt up to the Dakota throttle shaft.
The idea was to reduce throttling losses due to the fact that there was this really aerodynamically ugly obstruction in the intake airflow. I calculated that said airflow reached speeds of about 60 MPH at the point where it met the throttle plate. If I had a single larger throttle opening (as opposed to two tiny sliver openings), I figured that it might cut down on throttling losses.
However, I did not see anything definitive, either for or against. Maybe I'll try it again this summer.
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