![]() A valve seat supporting annular stepped surface( 14) is formed on an intake port outlet portion of a cylinder head ( 1), its inner peripheral edge is formed into a shape having an inner peripheral edge ( 4 a) of a valve stem ( 4)for serving as a base circle, and a extending portion ( 15) projecting toward a side of a valve stem ( 11) is provided on a radial intake port inlet side portion. ![]() ![]() An object of the present invention is to restrict a part of intake flow which is apt to flow in a direction opposite to a counter swirl flow after colliding against a valve stem, and to produce an intense swirl while controlling a worsening of flow coefficient.
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