The variable camshaft timing has a variable · adjustment range of 0 - 40° kW. The valve

911 Engine 1 The variable camshaft timing has a variable adjustment range of 0 - 40° kW. The valve stroke control facilitates decreased or increased valve strokes. When idling or near idling, the engine control is optimised by switching the intake valve stroke to a small cam with 3.6 mm and an adjustment of the valve timing for minor valve overlap. This results in a frictional loss reduction owing to the small valve stroke, decreased charge-exchange losses by extremely decreased opening times and few exhaust fumes from previous combustion in the combustion chamber for an even and rapid combustion. These measures produce a clear reduction in consumption together with noticeably improved idling quality. 1_11_02 In full-load conditions, a high torque and high peak power output is achieved through low-loss charge exchange process and precision designed cam contour at an intake valve stroke of 11 mm. Furthermore, the opening and closing times of the valve lift are also adjusted towards advanced. 1_10_02 As the valve timing is variable, the decreased valve stroke can be maintained in the partial load range and the valve overlap can be optimised. 2002 Service Information 1 - 13