Flat faced follower will also side load the lifter into the block!
Nothing to the extremes of the roller follower combination though…. But worth looking into IMO.
Look up the force diagrams from Nortons book.
Extreme SFT combinations can double or triple that load through their much higher Normal force, the lever arm is always the same (lifter radius).
With that in mind.. put a safety factor from PMD engineers at 2-3 on their lifter valley design and you’re knocking at the gate … (in extreme appl. btw)
Kris.
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