VTEC System Description - Construction

VTEC is composed of the VTEC camshaft, the VTEC rocker arm, and the rocker arm oil control valve.

VTEC Camshaft 

The camshaft is structured so that each cylinder has an intake cam and an exhaust cam. The same cam lobe is used both in the normal valve control and the all-cylinder valve stop control.

Courtesy of HONDA, U.S.A., INC.

VTEC Rocker Arm 

Each rocker arm is divided into the intake primary rocker arm, the intake secondary rocker arm, the exhaust primary rocker arm and the exhaust secondary rocker arm. The inner side of the rocker arms have two VTEC switching pistons and a return spring.

Courtesy of HONDA, U.S.A., INC.

Rocker Arm Oil Control Valve 

Rocker arm oil pressure sensor A and rocker arm oil pressure sensor B are provided in the rocker arm oil control valve and monitor the hydraulic status and the statuses of the rocker arm oil control solenoid and the valve.

Courtesy of HONDA, U.S.A., INC.