Abstract: A valve actuation system comprises a first arm having a first arm contact surface and operatively connected to a valve actuation motion. A second arm having a second arm contact surface is operatively connected to the at least one engine valve. A discrete lost motion device is provided that is controllable between a first, motion conveying state and a second, motion absorbing state. The discrete lost motion devices comprises a plunger contact surface and a housing contact surface. The housing contact surface is configured to engage one of the first or second arm contact surfaces, and the plunger contact surface is configured to engage another of the first and the second arm contact surfaces. The first and second arm contact surfaces, the housing contact surface and the first plunger contact surface are configured to support the discrete lost motion device between the first arm and the second arm.

Abstract: This disclosure provides a cast cylinder head includes two cooling jackets for use with an internal combustion engine, a method of fabricating a cylinder head, and a casting core assembly for fabricating a cylinder head. The cast cylinder head includes at least one cast-in orifice, which fluidly connects the two cooling jackets and is formed during a casting process of the cylinder head. The method of fabricating a cylinder head includes utilizing an assembly including an upper cooling jacket core and a lower cooling jacket core for forming respective upper and lower cooling jackets and at least one cast-in orifice fluidly connecting the cooling jackets.

Abstract: This disclosure provides a cylinder head having a structure allowing for more uniform lateral coolant flow, and an internal combustion engine including such a cylinder head. The cylinder head includes a lower water jacket cavity, an upper water jacket cavity in fluid communication with the lower water jacket cavity through plural orifices formed in cylinder head material between the lower and upper jacket cavities, and a coolant outlet passage extending from the upper water jacket cavity to a lateral side of the cylinder head. A rail cavity is provided in the cylinder head, extends in a longitudinal direction of the cylinder head, and is in fluid communication with the coolant outlet passage. A lateral passage is provided in the cylinder head upstream from the coolant outlet passage with a portion of the rail cavity therebetween.