To overcome the inefficiency of the throttle plate, a variable area Venturi has been developed, patented, designed, and tested. The resulting design is a Venturi induction system, whereby the Venturi area is varied by an axial moving pintle. Engine throttling is accomplished by changing the area of the Venturi rather than imparting an unrecoverable pressure loss. Figure 1 shows a three-dimensional drawing of a PRV manifold for a four-cylinder engine. All pintles are withdrawn in parallel when the gas pedal is pressed. The pintle movement along the axis of the Venturi (refer to Figure 2) changes the flow area to provide throttle control of the engine. The pintle-regulated Venturi (PRV) induction system recovers pressure in the Venturi discharge, thereby reducing the work required for the engine to breathe.