| 摘要 |
A method of manufacturing a cylinder for an internal combustion engine, which is manufactured by a process wherein a raw cylinder body having an insert core left remained therein is obtained using an insert core comprising a cylindrical body having almost the same outer diameter as the diameter of bore of the cylinder, and a scavenging port-forming portion projecting radially outward from the cylindrical body and having almost the same cross-sectional configuration as that of the scavenging port, the cylinder bore of the raw cylinder body thus obtained is then subjected to a boring to remove the cylindrical portion of the insert core, and the scavenging port-forming portion of the insert core which is left remained in the raw cylinder body is removed by making use of a press.
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