Cylinder valve operating system

A cylinder valve operating system comprising:

• at least one cylinder valve;
• a camshaft with at least one set of cams including a first cam and a second cam;
• a rocker arm pivotable about a rocker arm axis,
• said rocker arm having at least one finger engageable with said at least one cylinder valve for actuating said cylinder valve as said rocker arm pivots about said rocker arm axis;
• a first free cam follower supported by said rocker arm for pivotable motion about a first free cam follower axis stationary relative to said rocker arm and driven by said first cam for pivotable motion relative to said rocker arm about said first free cam follower axis;
• a first lever supported by said rocker arm for rotatable motion about a first lever axis stationary relative to said rocker arm, said first lever having an engaged position wherein said first lever is in driving engagement with said first free cam follower at a portion radially spaced from said rocker arm axis to provide a positive motion connection between said first free cam follower and said rocker arm as said free cam follower pivots, and a disengaged position wherein said first lever is out of driving engagement with said first free cam follower to provide a lost motion between said first free cam follower and said rocker arm as said first free cam follower pivots;
• a second free cam follower supported by said rocker arm for pivotable motion about a second free cam follower axis and driven by said second cam for pivotable motion relative to said rocker arm about said second free cam follower axis;
• a second lever supported by said rocker arm for rotatable motion about a second lever axis stationary relative to said rocker arm, said second lever having an engaged position wherein said second lever is in driving engagement with said second free cam follower at a portion radially spaced from said rocker arm axis to provide a positive motion connection between said second free cam follower and said rocker arm as said second free cam follower pivots, and a disengaged position wherein said second lever is out of driving engagement with said second free cam follower to provide a lost motion between said second free cam follower and said rocker arm a said second free cam follower pivots;
• a first spring resilietly biasing said first lever toward said engaged position thereof;
• a second spring resiliently biasing said second lever toward said disengaged position thereof;
• and
• means for driving saint first lever toward said disengaged position thereof against said first spring and said second lever toward said engaged position thereof against said second spring.