High performance power valve for a carburetor

A power valve for a carburetor for an internal combustion engine, comprising:

• a substantially radially symmetric housing having a central axis and including a tubular aperture extending concentrically therethrough, an annular flange portion and one or more outlet apertures extending through said annular flange portion, and a threaded portion adapted for threading into a metering block of the carburetor, said tubular aperture having an inlet seat in fluid communication with a source of liquid fuel for the engine;
• a diaphragm having one side in fluid communication with the partial vacuum produced by the engine, said diaphragm being disposed in a first position when said vacuum is low and a second position when said vacuum is not low;
• a plunger operably coupled at a first end thereof to the other side of said diaphragm and being slidingly disposed within said tubular aperture, said plunger having an inlet end adapted to seat against said inlet seat of said tubular aperture and thereby substantially prevent the fuel from entering said tubular aperture when said plunger is in said second position, said inlet end of said plunger being adapted to be unseated from said inlet seat and thereby substantially permit the fuel to enter said tubular aperture when said plunger is in said first position, wherein an exterior surface of said annular flange portion through which said one or more apertures extend is curved with a radius about equal to or greater than the axial length of said threaded portion.

A power valve for a carburetor for an internal combustion engine, comprising:

• a substantially radially symmetric housing having a central axis and including a tubular aperture extending concentrically therethrough defining a substantially cylindrical body of said housing, an annular flange portion and one or more outlet apertures extending through said annular flange portion, and a threaded portion adapted for threading into a metering block of the carburetor, said tubular aperture having an inlet seat and an outlet end, said inlet seat being in fluid communication with a source of liquid fuel for the engine;
• a diaphragm having one side in fluid communication with the partial vacuum produced by the engine, said diaphragm being disposed in a first position when said vacuum is low and a second position when said vacuum is not low;
• a plunger operably coupled at a first end thereof to the other side of said diaphragm and being slidingly disposed within said tubular aperture, said plunger having an inlet end adapted to seat against said inlet seat of said tubular aperture and thereby substantially prevent the fuel from entering said tubular aperture when said plunger is in said second position, said inlet end of said plunger being adapted to be unseated from said inlet seat and thereby substantially permit the fuel to enter said tubular aperture when said plunger is in said first position, wherein said housing includes a plurality of substantially rectangular apertures therethrough, said apertures being in fluid communication with said outlet end of said tubular aperture, and wherein said outlet end of said tubular aperture is radiused a substantial amount as compared to the thickness of said body to provide a curved surface on the inside of said tubular aperture.