VarioCam is an automobile variable valve timing technology developed by Porsche.
Porsche's more recent VarioCam Plus combines variable valve timing with two-stage lift on the intake side.
The two-stage valve-lift function is performed by electro-hydraulically operated switchable tappets.
For improved responsiveness on cold starts, VarioCam Plus raises the amount of lift and retards valve timing.
For maximum power and torque, the lift is raised and the timing is advanced.