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

mullinax95 said

My "street" engine sounds like a race engine....lol
However aren't there formulas that can be used to determine spring rate?

I noticed on IMM Engine website that they offer a spring upgrade kit for solid cams. They state that it's a double spring package..... so I doubt the single beehive spring (for hydraulic cams) is sufficient for solid lifters. Or is it?

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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.