Swirl chamber and spark plug assembly

摘要

A swirl chamber and spark plug assembly comprises a unitary generally cup-shaped cylindrical member having external threads for removably installing it in the spark plug receiving hole of an internal combustion engine and a reduced diameter lower portion at the opposite end. The interior of the swirl chamber member has a central bore with internal threads at the top end and a stepped cylindrical swirl chamber defined by a lower cylindrical chamber and an upper cylindrical chamber of larger diameter for swirling gas in relation thereto. A spark plug having elongated electrodes is threadedly received in the top end of the swirl chamber with the spark plug gap at the juncture between the upper and lower chambers. A series of circumferentially-spaced, small-diameter orifices at the bottom of the lower chamber extend angularly inward and upward through the side wall of the swirl chamber body tangent to the side wall of the lower chamber and a small diameter central orifice extends axially through the bottom wall for drawing a fuel-air mixture into the stepped swirl chamber and injecting flames from the swirl chamber interior into the engine combustion chamber. When received in the spark plug hole of the engine, the reduced diameter portion of the swirl chamber protrudes slightly into the engine combustion chamber to expose the orifices for maximum fuel-air mixture and flame communication with the engine combustion chamber.