Gm Global Technolgoy Operations, Inc.

Kwok Y Ng

Rodney K Elnick

Glenn E Clever

Joel Cowgill

An engine assembly may include an engine block, a cylinder head, a fuel injector, and a fuel rail. The engine block may define a cylinder bore. The cylinder head may be coupled to the engine block and may define an intake port, an exhaust port, and a centrally located fuel injector opening between the intake port and the exhaust port. The fuel injector opening may be in direct communication with the cylinder bore. The fuel injector may be located within the fuel injector opening. The fuel rail may overlay the fuel injector opening and may be in communication with a fuel supply and the fuel injector.

Engine assembly including centrally located fuel rail

A two-step rocker arm assembly is provided having an arm member and a first roller assembly rotatably mounted with respect to the arm member and defining a generally C-shaped opening. A shaft member rotatably supports a second and a third roller assembly. The shaft member extends through the generally C-shaped opening and is selectively translatable therein to guide the second and third roller assemblies with respect to the arm member. A coupling lever is mounted with respect to the shaft member and is operable to selectively retain the shaft member with respect to the arm member for unitary movement therewith.

Two-step rocker arm assembly

A two step rocker assembly is provided having a lever body, a first roller assembly mounted to the lever body, and a center shaft extending through the first roller assembly. A second shaft extends through the lever body and defines a first pivot point. A coupling lever is pivotally connected to the second shaft and has an opening for receiving the center shaft. The coupling lever is rotatable about the first pivot point. A latch pin is mounted to the lever body. A second roller assembly is mounted on the center shaft. A spring lever is pivotally connected to the second shaft and is connected to the center shaft. The spring lever is rotatable about the first pivot point. A spring member is mounted on the lever body and engages the spring lever to bias the spring lever and the center shaft into the first position.

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Rochester Hills, MI, United States of America

Kwok Y Ng