Patent ID: 7891329

Claim:
An engine assembly comprising: a cylinder head at least partially forming a plurality of cylinders; first and second sets of one inner and two outer rocker arms, wherein the one inner and two outer rocker arms are configured to be selectively pinned for common pivoting; first and second sets of hydraulic lash adjusters operatively connected to first and second sets of said cylinders, respectively, and responsive to a variation in hydraulic fluid pressure to selectively pin the one inner and two outer rocker arms of the first and second sets of rocker arms and thereby cause a variation in lift of first and second sets of engine valves respectively operatively connected to said first and second sets of hydraulic lash adjusters; a first feed passage defined by said cylinder head, said first feed passage in fluid communication with said first set of hydraulic lash adjusters; and a second feed passage defined by said cylinder head, said second feed passage in fluid communication with said second set of hydraulic lash adjusters; wherein the valve lift of the first set of engine valves is independently variable by controlling the pressure of hydraulic fluid in the first feed passage, and the valve lift of the second set of engine valves is independently variable by controlling the pressure of hydraulic fluid in the second feed passage.