Editing Variable valve timing (section)

===Cam switching===
This method uses two cam profiles, with an actuator to swap between the profiles (usually at a specific engine speed). Cam switching can also provide [[variable valve lift]] and variable duration, however the adjustment is discrete rather than continuous.

The first production use of this system was Honda's [[VTEC]] system. VTEC changes hydraulic pressure to actuate a pin that locks the high lift, high duration rocker arm to an adjacent low lift, low duration rocker arm(s).