Audi cylinder head with 5 valves and camshaft adjustment recognition of the arrangement of the five-valve technique operation of the valves by use of weaker springs recognition of the channels by varying colours Porsche camshaft adjustment can be operated description ordernumber 1288 see also: Common-rail high pressure pump with fuel-delivery regulation valve and injector Common rail injection pump from Delphi cylinder head, diesel direct injection, with four-valve technology cylinder head with prechamber