math class needed on valve springs

[Myron Piatek]

Originally Posted by gmonde

what is the math formula for a known spring rate to calculate seat and open pressure ?

spring rate is 370lbs @ 1.00"

closed valve spring installed heigh1.780
open valve spring height 2.237

seat pressure ?
open pressure ?

thanks in advance

If you meant to say "open valve spring height 1.237" then the difference is .543"

370 rate x .543" lift = 200.91 lbs more than whatever you set/start with the installed height at.

You have to have a baseline height/pressure to calculate from, which the spring chart or actual test pressure will provide. That height is a variable based on valve stem length, +/std./- locks & retainers, spring seat machine work, depth of valve job seats.