Cylinder head with integrated turbocharger

A cylinder head assembly for an internal combustion engine, the assembly comprising:

• a cast cylinder head;
• a turbocharger housing integrally cast with the cylinder head;
• a wastegate housing integrally cast with the cylinder head and the turbocharger housing;
• and
• a water jacket cast into the cylinder head and the integrally cast turbocharger housing and wastegate housing, the water jacket extending from a first end to an opposite second end and comprising:
• separate upper and lower turbocharger housing water jackets cast into the integrally cast turbocharger housing;
• separate upper and lower wastegate housing water jackets cast into the integrally cast wastegate housing;
• and
• separate upper and lower cylinder head water jackets cast into the cylinder head,
• wherein the upper cylinder head water jacket receives a first flow of coolant at the water jacket first end to cool exhaust gas flow in an exhaust manifold, and subsequently supplies the first flow of coolant to the upper turbocharger housing water jacket and the upper wastegate housing water jacket disposed at the water jacket second end,
• wherein the lower cylinder head water jacket receives a second flow of coolant at the water jacket first end to further cool the exhaust gas flow, and subsequently supplies the second flow of coolant to the lower turbocharger housing water jacket and the lower wastegate housing water jacket disposed at the water jacket second end,
• wherein the first and second flows of coolant are separated as they flow between the first and second ends of the water jacket.