Valve actuation system for engine and valve lifter and rocker arm for same

A valve lifter for a valve actuation system in an engine comprising:

• an elongate lifter body defining a longitudinal center axis and including an end section having a longitudinally extending pushrod bore formed therein, a pushrod seat centered on the longitudinal center axis within the longitudinally extending pushrod bore, a fork having an inboard leg and an outboard leg, and a middle section transitioning between the end section and the fork;
• the inboard leg is spaced from the outboard leg to form a roller pocket, and the inboard leg and the outboard leg forming coaxial pin bores structured to receive a roller pin for supporting a roller in the roller pocket;
• and
• a center plane is defined between the inboard leg and the outboard leg and is spaced an offset distance from the longitudinal center axis.

A rocker arm for a valve actuation system in an engine comprising:

• a rocker arm body including a rod end, a valve end, a center section, and each of a first lateral side and a second lateral side extending between the rod end and the valve end;
• the rocker arm body further having a pivot pin bore formed in the center section and extending horizontally through the rocker arm body between the first lateral side and the second lateral side and defining a pivot axis;
• a rocker arm center plane extends through a center point of the pivot axis and is located equidistant between the first lateral side and the second lateral side;
• the valve end further having a first bore formed therein and located symmetrically between the first lateral side and the second lateral side, such that the first bore is bisected by the rocker arm center plane;
• and
• the rod end further having a second bore formed therein and located asymmetrically between the first lateral side and the second lateral side, such that the second bore is offset relative to the rocker arm center plane and located relative closer to the first lateral side than to the second lateral side.