Variable swirl intake system with cylinder head casting core

摘要

PPROBLEM TO BE SOLVED: To provide a core enabling to precisely cast a cylinder head including two intake ports opening to a combustion chamber of an internal combustion engine and two intake air branch flow passage communicating to each intake ports. PSOLUTION: This invention relates to compound core 141, 142 for casting the cylinder head 1 for an internal combustion engine including two intake air passages 22, 23 composed of the intake air branch flow passages 22a and 2b, 23a and 23b. The cores include a pair of cores for forming an intake air branch flow passage 122a and 122b, 123a and 123b, and inserts 131, 132 gripped by the both cores as one unit. PCOPYRIGHT: (C)2006,JPO&NCIPI