Rocker Arm Oil Control Valve
Rear rocker arm oil control valve
Rocker arm oil control solenoid A (bank 1), solenoid B (bank 1), and the VTEC spool valve are integrated and installed on the rear rocker arm oil control valve. The solenoids are switched to ON and OFF by signals from the powertrain control module (PCM), and the direction of the hydraulic pressure acting onto the spool valve is changed accordingly. By doing this, the direction of the hydraulic pressure acting onto the VTEC switching pistons in the intake and exhaust rocker arms of each cylinder at the rear bank is also changed, and low lift, high lift, and cylinder stop are activated alternately.
Front rocker arm oil control valve
Rocker arm oil control solenoid A (bank 2) and the VTEC spool valve are integrated and installed on the front rocker arm oil control valve. The solenoids are switched to ON and OFF by signals from the PCM, and the direction of the hydraulic pressure acting onto the spool valve is changed. By doing this, the direction of the hydraulic pressure acting onto the VTEC switching pistons in the intake rocker arms of each cylinder of the front bank is changed, and low lift and high lift are reversed.