Spring Pressures. Solid roller lifter on a hyd roller cam.

dart19666 said
I would not say formulas so mush as a combo if the Velocity of the lobe combined with the rocker ratio, and valve train weights. In simple terms a higher rocker arm ratio gives you a better mechanical advantage for the back side of the lobe. I have 1000's of lobe profiles that have been tested with different rocker arm ratios and different valve train weights. Believe me if I could make an Algorithm for this very thing it would be a game changer. You can in box me on my thoughts and I will be straight with you if it is good or a bad set up. I work with IMM engines and 90% of all the top engine builders in the world doing this very thing IE. Lobe profile to spring pressure set-up.

Does Crower have a spintron or do you rent time on one from time to time?

I've been screaming for years about guys letting spring pressures drop. It's a parts killer. I've seen valve locks cracked into mutineers pieces, fretting of the lock and retainer, lock grooves beat senseless, seats beat down, valve faces coined...you know what I'm say. And that's almost always traceable to low spring load.