Accord V6-3.0L Hybrid (2005)
Variable Valve Timing Solenoid: Description and Operation
Variable Cylinder Management (VCM) System
The i-VTEC (intelligent variable valve timing and lift electric control system) adopts a cylinder pause VTEC (variable cylinder system). The cylinder
pause VTEC system pauses the intake and exhaust valves on the rear bank under certain conditions such as cruise and fuel cut (see illustration). Since the
valves on the rear bank are closed, the frictional losses from valve spring compression and pumping are reduced because no air is compressed in the rear
bank. This reduces engine drag.
Operation
During 6 Cylinder Mode (Intake valve side)
The VTEC spool valve switches oil pressure. Oil pressure then enters primary rocker arm A from the oil passage in the intake rocker shaft, and it moves
the VTEC switching piston in the rocker arm. This causes the VTEC switching piston to slide into primary rocker arm B, locking primary rocker arms A
and B together. Primary rocker arms A and B are then actuated by the secondary rocker arm.
