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AUDI has been producing advanced 8 cylinder engines since 1988. Their capacity has increased from 3.6 l to 4.2 l. The V8 engine in combination with Aluminium Space Frame technology was the technical basis for Audi s breakthrough into the luxury class. SSP217 048 Steps to enhance the value of the Audi A8 have included the redesign of the V8 engine. The new V8 5V engines are now also available for the Audi A6 model range. 2 Content Page Introduction Technical data .. 5 Engine Mechanics Crankgear 6 Engine mounting 9 Engine lubrication . 10 Cooling circuit .. 16 Cylinder head Five valve technology 19 Roller rocker 20 Camshaft adjuster .. 22 Toothed belt drive; cylinder head seal .. 24 Cylinder head cover seal . 25 Exhaust manifold . 26 Engine Motronic Subsystems Variable intake manifold 27 Secondary air system .. 32 Engine Management System overview . 36 Function diagram .. 38 Quick start functions Camshaft position sensor .. 40 Engine run down sensor . 41 Electronic throttle function . 42 CAN bus interfaces 44 Additional signals / interfaces .. 46 Service 49 New Caution The self study programme provides you with information Important concerning the engine s construction features and functions. The self study programme is not a repair manual When carrying out maintenance and repair work, it is essential to use the latest technical literature. 3 Introduction V8 5V Engines SSP213 073 Major modifications were made to the New features V8 engines during the course of further Five valve cylinder head with roller rocker development. Camshaft adjustment Emphasis was placed on the following 3 stage variable intake manifold development objectives Engine management system, Bosch ME 7.1 Electro hydraulic engine mounting compliance with future exhaust emission regulations Modifications reduction of fuel consumption to crankcase and crankgear increas