Patent ID: 6948229
Filing Date: 2005-09-27
Classification: F02B,F02D,F02F,F02M,Y02T,Y10T

Abstract:
1. A manufacturing method of a variable tumble flow-generating intake port, which comprises the steps of: preparing an upper mold in which a space for forming a first passage of an intake port is provided; preparing a lower mold in which a space for forming a second passage of the intake port is provided; forming a stepped portion being capable of assembling with a metal plate, at a portion where the upper and lower molds are assembled with each other; assembling the metal plate serving as a bulkhead, with the stepped portion; assembling the upper mold with the lower mold and filling a molding sand into the resulting mold assembly; disassembling the mold disassembly so as to release an intake port core integral with the metal plate; and assembling and casting the intake port core with a mold in which a cylinder head is cast, and removing the casting sand from the intake port core such that the metal plate serving as the bulkhead remains in the intake port.