Patent 7434564 was granted and assigned to AVL (engineering company) on October, 2008 by the United States Patent and Trademark Office.
A cylinder head for an internal combustion engine wherein intake openings to the cylinder are partly surrounded by a mask formed by a material projection of the top face of the combustion chamber, a contour of the mask having a flat main section of maximum height between an ascending and descending flank and being asymmetrical in a developed view.