math class needed on valve springs
 

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

Re: math class needed on valve springs
 

this might help


https://help.summitracing.com/app/an...ve-spring-rate

Re: math class needed on valve springs
 

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.

Re: math class needed on valve springs
 

If you can afford it, this is the cats meow..............


https://static.summitracing.com/glob...-sm-600_ml.jpg
https://www.summitracing.com/parts/l...+5ba26a96cdb6b


Wish I had it years ago!

Re: math class needed on valve springs
 

What is the valve lift on the int. and exh.?. gsa612

Re: math class needed on valve springs
 

If you can find a comparable spring on the PAC Racing site, this link to their spring rate calculator might help.


https://www.racingsprings.com/index..../?sku=PAC-1224


Edit: Change the part number to your match.

Re: math class needed on valve springs
 

The basic formula is F=kX . F is the force , k is the rate , X is the difference in spring height from the length of the spring when it is not loaded .

Re: math class needed on valve springs
 

Is the spring rate 370lbs per inch? Is the installed height 1.780? Open height can't be more than closed, what is the free height of the spring?

Re: math class needed on valve springs
 

This is correct.

To add to above, the spring rate is stated as the force generated per unit of compression. Ex: 1,000 Lbf/Inch, 1,700 N/cm etc.


Also, its spring FORCE, not pressure. Spring pressure is a common misnomer racers seem to always use, and it just wont die. Its entirely wrong. Its not a pressure, Its a force.

Re: math class needed on valve springs
 

.457