Patent Number: 7,784,442

Title: Turbocharged engine cylinder head internal cooling

Abstract: An engine cylinder head has an exhaust manifold cast in the cylinder head. A turbocharger with a turbine body is adapted to mount directly to an exhaust outlet mounting face of the exhaust manifold. A dual level water jacket within the cylinder head has separate coolant feeds for upper and lower cooling jackets. The cooling jackets extend above and below the exhaust outlet and are connected inward of the exhaust mounting face to reduce metal temperatures of the mounting face below those of the turbocharger exhaust inlet flange. Separate cores for the upper and lower jackets are connected at coolant inlet and outlet locations at opposite ends. Intermediate core print connectors form controlled flow passages between the upper and lower jackets and exhaust ports in the cylinder head and integrated manifold. The improved cooling in these areas lowers operating temperatures in the cylinder head and obviates the need for a separate exhaust manifold.

Inventors: Lester; Dominique T. (Oxford, MI), Ostrowski; Douglas (Farmington Hills, MI)

Assignee: GM Global Technology Operations, Inc.

International Classification: F01P 3/14 (20060101)

Expiration Date: 8/31/12018