Patent ID: 7198026

Claim:
A divider plate for two or more inlet ports provided in a cylinder head of an internal-combustion engine comprising: at least two divider portions that divide an interior of the two or more inlet ports along an intake air flow; a side cast-in insert portion provided on at least one side portion of the divider plate located in a direction perpendicular to that of the intake air flow, that is enclosed by molten metal during casting of the cylinder head; an inner cast-in insert portion that is provided between adjacent divider portions, that is enclosed by the molten metal during the casting of the cylinder head; and an inner accelerator formed in the inner cast-in insert portion, that accelerates coagulation of the molten metal, wherein the inner accelerator has at least one of a plurality of holes, a concave portion, a convex portion, and a concave-convex portion, or a combination of a hole and a concave portion, a convex portion or a concave-convex portion.