Patent ID: 6842978
Filing Date: 2005-01-18
Classification: F02B,F02F,F05C,Y10T

Abstract:
1. A method of manufacturing a cylinder head for a small engine comprising the steps of casting a cylinder head having an as-cast cylinder chamber defined by a cylinder wall, an as-cast spark plug blind opening, cooling fins, an exhaust port extending from the cylinder chamber to a first face on an exhaust port flange, an intake port extending from said cylinder chamber to a second face on an intake port flange, fastener openings in said first and second faces, a foot flange having an as-cast mounting surface at an end of said cylinder chamber, and having as-cast fastening openings in said foot flange, wherein said as-cast spark-plug blind opening is formed without the use of a through core pin and the blind opening is entirely closed at one end by a thin web; machining said cylinder wall to a predetermined tolerance; removing said thin web of the blind opening to form a spark plug through aperture communicating with another end of the cylinder chamber; and tapping said spark plug through aperture.