valve springs for roller cam

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valve springs for roller cam

Post  hbstang on July 26th 2017, 6:55 pm

i am going to be running this cam with a429 cobra jet aluminum heads,what springs should i be using for it?
The M-6250-A514 cam and tappet kit features an induction hardened steel mechanical roller cam with the following specs:
Feature
Max lift
Duration @ .050" lift Centerline
Lobe separation Events @ .050" open
close
Intake .647" 254° 107°
20° BTC 54°ABC .020" .014"
112°
Exhaust .647" 258° 117°
66° BBC 12°ATC .020" .014"
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Re: valve springs for roller cam

Post  BOSS 429 on July 26th 2017, 8:18 pm

what installed height do you have to work with?
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Post  hbstang on July 27th 2017, 12:07 am

they check 1.970 .i was told the heads came from you,from a 545 in colorado.


Last edited by hbstang on July 27th 2017, 9:10 am; edited 1 time in total
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Re: valve springs for roller cam

Post  BOSS 429 on July 27th 2017, 8:24 am

hbstang wrote:they check .970 .i was told the heads came from you,from a 545 in colorado.


You must mean 1.970, look at 947-16 comp cams


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Re: valve springs for roller cam

Post  BOSS 429 on July 27th 2017, 8:27 am

Hi-Tech Triple Valve Springs
O.D.: 1.645"
I.D.: .635"
Seat Load: 338 lbs/in @ 2.000
Open Load: 849 lbs/in @1.250
Coil Bind: 1.145"
Rate: 681 lbs/in.
16/pkg.



save you the trouble of looking

I have used these a LOT
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Re: valve springs for roller cam

Post  dfree383 on July 27th 2017, 9:20 am

That's way to much spring for that combo
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Re: valve springs for roller cam

Post  rmcomprandy on July 27th 2017, 9:29 am

No where in there does it explain anything about the aggressiveness of those lobes and therefore to much spring is better than not enough but, asking the camshaft manufacturer what pressures are needed would be best.

After knowing what pressures are necessary ... then you can find a spring which fits into your package.

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Post  hbstang on July 27th 2017, 9:34 am

what springs did ford use in the 521M-6007-521FT crate engine with this cam?this will never see 6500 rpm.crate engine peaked at 5750 and that was with the scj heads.is there a part number for the springs?
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Re: valve springs for roller cam

Post  dfree383 on July 27th 2017, 10:48 am

rmcomprandy wrote:No where in there does it explain anything about the aggressiveness of those lobes and therefore to much spring is better than not enough but, asking the camshaft manufacturer what pressures are needed would be best.

After knowing what pressures are necessary ... then you can find a spring which fits into your package.

It's a Ford racing crate motor cam..... the didn't use a big drag triple in the crate motor , no real reason to way over spring it now.
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Re: valve springs for roller cam

Post  dfree383 on July 27th 2017, 10:51 am

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Re: valve springs for roller cam

Post  hbstang on July 27th 2017, 11:46 am

this is the specs on the scj heads as they come from ford.
Assembled with solid roller springs: Closed seat pressure 240# @ 1.900"; Open seat pressure 625# @ 1.200"; Max lift .650"
comp cams has a spring p/n 954 that may work.
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Re: valve springs for roller cam

Post  dfree383 on July 27th 2017, 11:52 am

954 will work, but imo they are a little light, it you use them make sure to get Titanium retainers and keep it below 6500
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Re: valve springs for roller cam

Post  Lem Evans on July 27th 2017, 1:50 pm

PAC 1243.........same unit that's on the current SCJB package. Very good spring.

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Re: valve springs for roller cam

Post  BOSS 429 on July 27th 2017, 1:53 pm

rmcomprandy wrote:No where in there does it explain anything about the aggressiveness of those lobes and therefore to much spring is better than not enough but, asking the camshaft manufacturer what pressures are needed would be best.




After knowing what pressures are necessary ... then you can find a spring which fits into your package.

right

I would hope his head guy would know how to set these up, these will be around 290/300 and 700 open with that lift +LASH , they will loose about 30lbs
after run in


6500 OR 5000 RPM DOESNT MATTER bounce iS bounce, this is the very reason i see so many broken lifters on these boards, too light of presser, and these spring will last  quite a while with this cam


Last edited by BOSS 429 on July 27th 2017, 8:45 pm; edited 2 times in total
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Re: valve springs for roller cam

Post  supervel45 on July 27th 2017, 5:34 pm

https://www.summitracing.com/parts/cca-953-16

WoW Comp Cams only wants a 953 spring on a XR292 solid roller which is bigger then the SVO cam. I agree with with others that's too light and am not suggesting them., besides the installed height is wrong for the OP. The old book shows them at 475 at 1.280". Something in the 600lb range would seem better to me.

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Re: valve springs for roller cam

Post  dfree383 on July 27th 2017, 5:43 pm

supervel45 wrote:https://www.summitracing.com/parts/cca-953-16

WoW Comp Cams only wants a 953 spring on a XR292 solid roller which is bigger then the SVO cam. I agree with with others that's too light and am not suggesting them., besides the installed height is wrong for the OP. The old book shows them at 475 at 1.280". Something in the 600lb range would seem better to me.

For what it's worth ive used the 954-16 on XR 292 cams in the past and they worked fine and didn't break anything but floated at 6800-6900, flame suit on.....
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Re: valve springs for roller cam

Post  supervel45 on July 27th 2017, 5:47 pm

http://www.competitionproducts.com/PAC-Roller-Valve-Springs-1550-OD-240-1900-625-1200/productinfo/PAC-1243/

Here's the spec.s on the PAC 1243's. Too Light you Bounce Too Heavy you Stress Other Stuff, no winning it seems, sometimes. Suspect

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Re: valve springs for roller cam

Post  dfree383 on July 27th 2017, 5:51 pm

The PAC springs would be a good choice imo, the triple ones are way overkill for the mild crane grind that was used in the crate engines, plus that cam isn't going to make any power over 7000 anyway.


Last edited by dfree383 on July 27th 2017, 5:53 pm; edited 1 time in total
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Re: valve springs for roller cam

Post  supervel45 on July 27th 2017, 5:53 pm

dfree383 wrote:
supervel45 wrote:https://www.summitracing.com/parts/cca-953-16

WoW Comp Cams only wants a 953 spring on a XR292 solid roller which is bigger then the SVO cam. I agree with with others that's too light and am not suggesting them., besides the installed height is wrong for the OP. The old book shows them at 475 at 1.280". Something in the 600lb range would seem better to me.

For what it's worth ive  used the 954-16 on XR 292 cams in the past and they worked fine and didn't break anything but floated at 6800-6900, flame suit on.....

I think Comp's pushing that 953 for the stock lenght valves? The 954 seems like a step in the right direction.

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Re: valve springs for roller cam

Post  supervel45 on July 27th 2017, 5:57 pm

dfree383 wrote:The PAC springs would be a good choice imo, the triple ones are way overkill for the mild crane grind that was  used in the crate engines, plus that cam isn't going to make any power over 7000 anyway.

I agree. If it was an all out race engine and going into a high winding 429, sure more spring pressure, a 545 street deal not so much.

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Re: valve springs for roller cam

Post  BOSS 429 on July 27th 2017, 8:47 pm

dfree383 wrote:
supervel45 wrote:https://www.summitracing.com/parts/cca-953-16

WoW Comp Cams only wants a 953 spring on a XR292 solid roller which is bigger then the SVO cam. I agree with with others that's too light and am not suggesting them., besides the installed height is wrong for the OP. The old book shows them at 475 at 1.280". Something in the 600lb range would seem better to me.

For what it's worth ive  used the 954-16 on XR 292 cams in the past and they worked fine and didn't break anything but floated at 6800-6900, flame suit on.....


floating is bouncing
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Re: valve springs for roller cam

Post  rmcomprandy on July 27th 2017, 8:59 pm

Comp Cams has their version of the PAC 1243 spring - #943.

EDIT: I looked it up in the archives today ... The required minimum spring pressures for 7,000 rpm using A429 valve train weight with a crate motor cam, (from Crane, who designed it), is 225 on the seat 535 open; (at 640" valve lift).
That's 484 lb/in rate


Last edited by rmcomprandy on July 27th 2017, 9:21 pm; edited 2 times in total (Reason for editing : Spelling and addition)

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Re: valve springs for roller cam

Post  dfree383 on July 27th 2017, 9:11 pm

BOSS 429 wrote:
dfree383 wrote:
supervel45 wrote:https://www.summitracing.com/parts/cca-953-16

WoW Comp Cams only wants a 953 spring on a XR292 solid roller which is bigger then the SVO cam. I agree with with others that's too light and am not suggesting them., besides the installed height is wrong for the OP. The old book shows them at 475 at 1.280". Something in the 600lb range would seem better to me.

For what it's worth ive  used the 954-16 on XR 292 cams in the past and they worked fine and didn't break anything but floated at 6800-6900, flame suit on.....


floating  is bouncing

Really.......
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Re: valve springs for roller cam

Post  Lem Evans on July 28th 2017, 10:38 am

The PAC-1243 are a circle track spring and are more durable a typical drag race spring.

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Re: valve springs for roller cam

Post  Lem Evans on July 28th 2017, 10:39 am

If a guy wanted to get right down to it......the valves bounce and the springs float.

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