High Speed Operation
WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
The synchronizing pistons (1) move in the direction, as indicated, to mechanically connect the primary (4), secondary (2), and mid (3) rocker arms. The 3 rocker arms move as a single unit and are driven by the high range camshaft lobe (6). In this mode of operation, the valve timing and lift are set for high speed operation.
The oil is pulled from the oil sump through the screen (405). Oil pressure is generated in the oil pump (424) and is supplied through the oil filter (410) to the oil flow control module. The solenoid valve (412) is energized, moving the spool valve (414). Increased oil pressure is then supplied to the synchronizing pistons, which move to connect the primary, secondary, and mid rocker arms.