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: Petrol direct injection engine M 270 Mercedes Benz Mercedes-Benz A Class diesel engine with common rail technique pistons model case valve timing model case