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Old 12-08-2018, 12:30 AM   #1
gmonde
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Default 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
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Old 12-08-2018, 02:21 AM   #2
David Lee
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Default Re: math class needed on valve springs

this might help


https://help.summitracing.com/app/an...ve-spring-rate
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Old 12-08-2018, 09:57 AM   #3
Myron Piatek
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Post Re: math class needed on valve springs

Quote:
Originally Posted by gmonde View Post
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.
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Last edited by Myron Piatek; 12-08-2018 at 10:03 AM.
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Old 12-08-2018, 11:00 AM   #4
Chevy55
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Default Re: math class needed on valve springs

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



https://www.summitracing.com/parts/l...+5ba26a96cdb6b


Wish I had it years ago!
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Old 12-08-2018, 01:43 PM   #5
gsa612
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Default Re: math class needed on valve springs

What is the valve lift on the int. and exh.?. gsa612
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Old 12-08-2018, 04:59 PM   #6
FireSale
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Default 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.
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Old 12-08-2018, 06:08 PM   #7
ss3011
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Default 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 .

Last edited by ss3011; 12-08-2018 at 06:09 PM. Reason: Clarify
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Old 12-09-2018, 12:29 AM   #8
Eman
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Default Re: math class needed on valve springs

Quote:
Originally Posted by gmonde View Post
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
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?
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Old 12-09-2018, 11:47 AM   #9
Kevin Panzino
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Default Re: math class needed on valve springs

Quote:
Originally Posted by ss3011 View Post
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 .
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.
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Old 12-09-2018, 10:11 PM   #10
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Default Re: math class needed on valve springs

Quote:
Originally Posted by gsa612 View Post
What is the valve lift on the int. and exh.?. gsa612
.457
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