Exhaust manifold integrated cylinder head with water jacket

摘要

An exhaust manifold-integrated cylinder head having a water jacket has intake ports through which outside air is supplied and exhaust ports through which exhaust gas is discharged. Inlet valve holes and exhaust valve holes open the inlets and outlets. Spark plug holes are formed on an upper surface of the cylinder head. A head water jacket is formed in the cylinder head to allow a coolant to flow from one end to another end. The head water jacket has exit port bridge coolant passages formed between the exit ports. Lower coolant guides protrude in the cylinder head so that the coolant flows upward from a bottom side of the cylinder head through the exhaust port bridge coolant passages.