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| Valve Springs 95 220 https://slantsix.org/forum/viewtopic.php?t=61533 |
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| Author: | BUCKET 636 [ Wed Aug 23, 2017 3:10 am ] |
| Post subject: | Valve Springs 95 220 |
I am getting a cam grind done at Clive Cams here in Australia and he has suggested a valve spring rate of 95 seated and 220 open or thereabouts . Does anyone know of any brands with a rate close enough to this ? Cheers, Greg |
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| Author: | Dart270 [ Wed Aug 23, 2017 3:39 am ] |
| Post subject: | |
Greg, Can you post the cam specs? It sounds like stock Mopar 340 V8 valve springs would drop right in and work for you. Lou |
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| Author: | BUCKET 636 [ Wed Aug 23, 2017 12:14 pm ] |
| Post subject: | |
Lou , I don't have the cam or cam card yet but he told me it is a 160 grind at 114 profile . I guess the 160 is his part number for a specific grind . It is to suit a supercharger running low PSI. |
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| Author: | BUCKET 636 [ Wed Aug 23, 2017 12:33 pm ] |
| Post subject: | |
I found these 2 part numbers at Rock Auto http://www.rockauto.com/en/moreinfo.php ... cc=1079647 http://www.rockauto.com/en/moreinfo.php ... 28&jsn=606 The pressures are close to what has been recommended , which one do you suggest ? |
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| Author: | Charrlie_S [ Wed Aug 23, 2017 4:03 pm ] |
| Post subject: | |
A valve spring for a boosted motor needs to be stiffer, then for a non boosted engine with similar cam specs. A 1.44 dia intake valve with 20 psi boost will have 32 lbs less effective seat pressure then the same spring with zero psi boost. |
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| Author: | Charrlie_S [ Wed Aug 23, 2017 4:18 pm ] |
| Post subject: | |
A valve spring for a boosted motor needs to be stiffer, then for a non boosted engine with similar cam specs. A 1.44 dia intake valve with 20 psi boost will have 32 lbs less effective seat pressure then the same spring with zero psi boost. A 1.5 intake valve will have 35 lbs less effective seat pressure, at 20 lbs boost. A 1.6 intake valve would be 40 lbs less at 20 lbs boost. The larger the valve, and the more the boost, the greater on seat pressure is needed. Just using some numbers to show effect. Find the area of the valve head, (radius squared, times pi (3.14)) minus area of the stem, times boost. |
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| Author: | Rick Covalt [ Wed Aug 23, 2017 5:07 pm ] |
| Post subject: | |
Quote: A valve spring for a boosted motor needs to be stiffer, then for a non boosted engine with similar cam specs
Well I'll be!!! I never thought of that but it makes perfect sense! Learn something new every day.Rick |
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| Author: | BUCKET 636 [ Thu Aug 24, 2017 12:27 pm ] |
| Post subject: | |
Thanks blokes , will see what i can come up with . |
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