2-valve, 2-plug, 2-intake lean burn engine with squish flow with about 2/3 the combustion chamber under the exhaust valve

Abstract

An ignition-engine system for internal combustion engines having two-valves per cylinder () with a larger intake valve () and a smaller exhaust valve () in a longitudinal layout with a single camshaft () operating bucketed valve stemsandthat are vertical, with the valves making up essentially the roof of the combustion chamber and having a volume essentially under the intake valve of approximately 35% of the combustion chamber and a volume under the exhaust valve of approximately 65%, and two spark plugs per cylinder with plugs () and () located at the edge of two opposite squish-zones () of a compact combustion chamber, wherein the air-flow near TC is channeled between the two large squish-lands () and () wherein the cross-section of the channel is approximately constant of average width 'W', resulting in a relatively more compact combustion chamber having squish-lands take up approximately ⅓ of the projected bore area of the cylinder and the more compact channel to be approximately ⅔ of the bore area, wherein as the piston approaches ignition it provides an approximately orthogonal-to-the-main-flow () through the action of the squish walls which have a clearance of only about 0.06 inches with the piston at top center for improving knocking by moving the spark-flame kernel toward the hotter exhaust valve.