Quote:
Originally Posted by hancock
The valve operating mechanism in any 4 stroke engine is where special attention has to be made to protest 'sliding' surfaces. For instance the introduction of roller followers on cams.
So no hydrodynamic protection and wear protection will be based on the lubricant antiwear properties (ZDDP) and metalurgical considerations such as choice of material and surface treatment to the splines that move the 'collar mechanism' also how this movement interacts with the cams surfaces?.
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Don't know that VW has done so, but it isn't difficult from a design viewpoint to provide pressure lubrication to the splines. One only needs an oil galley through the center of the the camshaft. I suspect that VW would have seen spline lubrication as an issue early on.