| 摘要 |
A water-cooled internal combustion engine E is provided with a cylinder block water jacket Jb, a cylinder head water jacket Jh, and an exhaust manifold passage 38 in which exhaust gas discharged from combustion chambers 26 through exhaust ports 28 collects. The exhaust manifold passage 38 is formed only in a cylinder head 21. The exhaust gas that has collected in the exhaust manifold passage 38 is discharged through an exhaust outlet of the exhaust manifold passage 38 from a cylinder head 21 into an exhaust passage 39 formed in a cylinder block C. The exhaust manifold passage 38 is surrounded by the cylinder head water jacket Jh, the cylinder block water jacket Jb and a discharge water jacket 80 for carrying cooling water from the cylinder head water jacket Jh and the cylinder block water jacket Jb to the outside of the engine body. The engine E provided with the exhaust manifold passage 38 does not require any assembling work for sealing the exhaust manifold passage 38 and hence the cost of the combustion engine E can be reduced. A wall defining the exhaust manifold passage 38 can be efficiently cooled by the cooling water that flows through the water jackets.
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