Abstract: A twin jet carburetor includes a venturi having an elliptical cross section. Two needle jets and jet needles supply fuel to the airstream, allowing the system to operate as two carburetors in one body, but its overall size is much smaller. The elliptical shape venturi and pair of jets provide improved atomization and satisfy engine requirements at high rpm and wide-open throttle positions.

Abstract: Interchangeable venturi sleeves are removably positioned in open-ended bores of a carburetor center section. Each of the sleeves is colored a particular color corresponding to the physical parameters of the sleeve, for example, inner diameter and shape. Similarly, base plates and metering blocks of different capacities are provided such that the operating parameters of the carburetor can be changed. Like the venturi sleeves, the base plates and metering blocks are color-coded to indicate their physical parameters. With this color-coding, the observer can quickly and easily determine the physical characteristics of the carburetor.

Abstract: Venturi sleeves (24, 26, 28 and 30) are telescopically moved upwardly into the bores (14, 16, 18 and 20) of the carburetor body (12) until the annular shoulder (46) of each sleeve abuts a corresponding shoulder (36) of each bore. Booster venturis (74, 76, 78 and 80) are suspended coaxially with respect to the venturi sleeves (24-30) with the support conduit (86) extending through a notch (52) at the first edge of the venturi sleeve. Positioning cords (50) are formed in the lower outer cylindrical surface (44) of each venturi sleeve (24), so that the positioning cords (50) must face and abut each other when the venturi sleeves are properly inserted into the bores of the carburetor body, thus assuring that the sleeves are properly oriented in the carburetor body. Flow director surfaces (104, 106, 108 and 110) in the carburetor bowl (102) guide the air toward the venturi sleeves.

Abstract: A booster venturi (21) is removably mounted to the barrel (11) of a carburetor (10), with the venturi ring (26) concentrically located in the barrel. The support conduit (28) extending from the venturi ring (26) terminates in a threaded end that protrudes through a fuel port (50) in the sidewall of the carburetor. A connector nut (30) is threaded onto the threaded end of the support conduit (28), to seat the protrusion (40) about the support conduit (28) in the correspondingly shaped and sized recess (42) in the sidewall (46) of the carburetor. The connector tool (80) has a probe (84) that fits the internal passage (32) of the support conduit, and tool protrusions (86) that engage the tool bores (72) of the connector nut (30) so that the nut can be mounted first on the tool (80) and then the nut can be properly positioned in the fuel port (50) and rotated about the threaded end of the support conduit (28) to precisely and rigidly mount the venturi ring (26) concentrically in the barrel of the carburetor.

Abstract: A microbe propagation preventing apparatus and a microbe propagation preventing method are provided to prevent an ion from decreasing at a time of decomposing ozone generated by gaseous discharge or ionization so as to sufficiently generate air ion, and to sufficiently prevent propagation of microbes adhering to an object by using the air ion without secondary pollution. Further, in the apparatus and the method, a gas containing the ion is supplied into water so as to prevent the microbe propagation in the water. In the apparatus, an ozone decomposing chamber is mounted to be electrically insulated from an air duct. An electrode to remove a positive ion is mounted to obtain only a negative ion, and extend a lifetime of the obtained ion. An ion supplying portion is mounted to supply an ionized gas into a space housing the object in which microbes can be propagated, and return the ionized gas to an ionization chamber.

Abstract: A fuel to air admixture venturi nozzle having peripheral fuel distribution. A fixed air inlet having a convergent-divergent configuration has a booster cylinder disposed proximate the most narrow portion thereof. A peripheral venturi having a convergent-divergent cross-section is formed by cooperation of the booster cylinder with the walls of the air inlet. Fuel is delivered to the air inlet at the most narrow part of the peripheral venturi, achieving improved fuel atomization and distribution.

Abstract: A carburetor is disclosed as being formed by die casting and in the process employing two opposed juxtaposed casting cores to form the induction passage and main venturi therein with the result that a flashing of die case metal occurs as between the opposed juxtaposed cores generally transversely of the induction passage generally at the location of the throat of the venturi; after casting the carburetor, the carburetor is placed onto fixture means and a cutting and forming punch or tool is moved relative to the carburetor as to both cut through the said flashing and also seat against the metal of the upstream portion of the venturi in order to assure uniformity of contour thereof especially with respect to the venturi throat as cut and sized by the tool.