4.10.1 Schematic and Operation Jaguar XKR II facelift

The intake camshafts of the naturally aspirated engine have high lift and low lift modes of operation. This is achieved by providing two sets of cam lobes for each intake valve and splitting the tappets into two sections. Oil pressure operates on a pin in each tappet to engage high lift. The oil is controlled by a separate ECM commanded solenoid valve for each bank of cylinders. The transition from low to high lift happens at approximately 2,400 RPM.

Scheme 100