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Message: [QUOTE="TooManyToys, post: 1521529, member: 30841"] It was good that you can't read it as I had to make a correction anyway. To the chart I added the Hertzian contact pressure. The box to the left are the force values against the cam, but the box to the right is (I hope) the compression between the roller and lobe. It seems to fit in line with Escobar's calculations. I used the site noted at the bottom of the page for the calculations. The contact is so narrow between the two curved surfaces. [ATTACH=full]176640[/ATTACH] One page example from the site. [ATTACH=full]176641[/ATTACH] An image from Escobar's paper showing a side view of a fracture pit, which is why the Depth of Stress is important. [ATTACH=full]176642[/ATTACH] Again, there can be many different reasons why there are the cam/lifter failures, this is just one hypothysis and may be wrong. [ATTACH=full]176643[/ATTACH] [/QUOTE]

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