Cylinder Head and Camshaft Control

Cylinder Head and Camshaft Control







The requirements imposed on engine design in achieving high performance combined with good driving comfort, compliance with emission regulations and reduced fuel consumption lead to conflicting objectives in engine development.

The idea of creating a variable engine gave rise to the development of VarioCam Plus (premiered on the 911 Turbo 996). Such an engine is intended to provide peak performance in terms of torque and power output while also offering optimized emissions and fuel consumption in urban traffic or on country roads.







VarioCam Plus features vane adjuster and switchable hydraulic tappet control elements for adjusting the timing of the intake valves and switching the maximum valve lift of the intake valves between 3.6 mm and 11.0 mm on the basis of a programmed map. The vane adjuster, which is familiar from the 911 Carrera, has an adjustment range of 40°

The cylinder head and the camshaft timing system have been adopted from the 911 Carrera (997) for the purposes of implementing VarioCam Plus. The cylinder head consists of three parts - cylinder head base, flat-base tappet guide and cylinder head cover. Oil supply to the switch-able
hydraulic flat-base tappets is effected via integrated oil