6 cylinder high lift mode
The PCM switches rocker arm oil control solenoid A (bank 1) to ON, solenoid B (bank 1) to OFF, and solenoid A (bank 2) to ON. On the rear bank side, the pressurized oil from the oil pump passes through the VTEC spool valve and flows into the rear rocker arm. On the intake side, the hydraulic pressure is applied to the right side of synchronizing piston D in the figure, and the hydraulic pressure moves stopper piston C and synchronizing piston D to the left in the figure. By doing this, the intake primary rocker arm and the intake secondary H rocker arm are synchronized and joined and high lift drive is done by the cams with large valve lift. On the exhaust side, the hydraulic pressure is applied to the spring side of exhaust synchronizing piston, and by using the spring force and the hydraulic pressure to move synchronizing piston B and exhaust synchronizing piston in the direction of the arrow in the figure, the exhaust primary rocker arm and the exhaust secondary rocker arm are synchronized, causing them to move as one. On the front bank side, the hydraulic pressure from the oil pump is applied to the left side of the rocker arm piston, as the solenoid is ON and the spool valve is pushed to the lower side by the hydraulic pressure, so that the rocker arm piston is pushed to the right in the figure. The intake primary rocker arm and the intake secondary H rocker arm are synchronized and joined, and high lift movement is done by the cams with a large valve lift.