EXHAUST PORT STRUCTURE OF INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide an exhaust port structure of a internal combustion engine capable of suppressing the thermal propagation to a cylinder head body from an exhaust port liner to the utmost. SOLUTION: A cylinder head 7 has the cylinder head body 9 and the cylindrical exhaust port liner 10 The exhaust port liner 10 is supported on the cylinder head body 9 at a plurality of portions partially, and a heat insulating layer 13 is arranged around the exhaust port liner 10.