Patent ID: 6832583
Filing Date: 2004-12-21
Classification: F02D,Y02T,Y10T

Abstract:
A valve train for an overhead cam piston engine including first and second intake valves and at least one exhaust valve per cylinder, the cylinders being disposed in at least one cylinder bank, and the valve train comprising:at least one overhead camshaft for each cylinder bank including high lift and reduced lift cams for each intake valve; a direct acting valve lifter for each intake valve, the valve lifters being selectively operable to actuate the intake valves of all cylinders in a high lift mode or to actuate the intake valves of at least some of the cylinders in a reduced lift mode; wherein, in the reduced lift mode, the intake valves of at least selected cylinders are actuated in a low valve lift mode in which the first intake valves have a low valve lift opening greater than the low valve lift opening of the second intake valves.