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12-08-2018, 12:30 AM
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#1 |
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Senior Member
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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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12-08-2018, 02:21 AM
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#2 |
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Re: math class needed on valve springs
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12-08-2018, 09:57 AM
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#3 | |
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Re: math class needed on valve springs
Quote:
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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LOCOMOTION Racing Last edited by Myron Piatek; 12-08-2018 at 10:03 AM. |
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12-08-2018, 11:00 AM
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#4 |
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Banned
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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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12-08-2018, 01:43 PM
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#5 |
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Re: math class needed on valve springs
What is the valve lift on the int. and exh.?. gsa612
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12-08-2018, 04:59 PM
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#6 |
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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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Dale Shearon 68 Mustang 6394 |
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12-08-2018, 06:08 PM
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#7 |
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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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12-09-2018, 12:29 AM
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#8 | |
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Re: math class needed on valve springs
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12-09-2018, 11:47 AM
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Re: math class needed on valve springs
Quote:
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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12-09-2018, 10:11 PM
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#10 | |
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Senior Member
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Re: math class needed on valve springs
Quote:
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Linear Mode
