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This paper deals with the design, development and supply of complete camshaft chain packages with particular reference to the whole system approach. The whole system embraces the timing chain, tightside guide, cam to cam guide, slack side pivot blade, tensioner assembly and cam and crank sprockets - also included are associated oil pump and accessory chain drives often complete with engine front cover assemblies. With the rising demands for quality and cost savings, the relationship between vehicle engine makers and component suppliers has entered a new era of profound change which is transforming the automobile component industry. The demands now placed on cam chain components resulting from multi cam and multi valve systems are discussed together with the requirements of a more dedicated and detailed technical approach to all associated camdrive items.

The paper deals with wear performance of roller chain camshaft drives, with particular reference to engine condition and its effect on lubricating qualities of automotive oils and the consequences concerning chain wear. Serious lube oil contamination is a feature frequently encountered in diesel engines and can also arise in gasoline units brought on by certain aspects of engine design, service intervals and the type of vehicle usage. The development story of a special Extra Life Roller Chain is dealt with in detail, involving engine and rig evaluation together with comparative chain wear tests on used automotive oils in various stages of contamination from a variety of known applicational duties. The work culminates in the development of a chromised pin chain giving exceptional extra life, combating the effect of lube oil contamination.