Variable lost motion valve actuator and method

An engine valve actuation system comprising:

• a pivoting bridge including (1) a first end for contacting an adjustable tappet, (2) a second end for contacting a valve stem, and (3) a pivot point between the first and second ends;
• an adjustable tappet in contact with the first end;
• a valve stem in contact with the second end;
• a valve train element in contact with the pivot point;
• a trigger valve;
• means for providing hydraulic communication between the trigger valve and the adjustable tappet;
• and
• means for controlling the operation of the trigger valve to adjust the position of the adjustable tappet,
• wherein the means for providing hydraulic communication between the trigger valve and the adjustable tappet further comprises an accumulator tappet slidably disposed in an accumulator bore, said accumulator tappet being adapted to contact an end of the accumulator bore such that an amount of lost motion provided by the system is limited.