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Need help with valve springs

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Need help with valve springs Empty Need help with valve springs

Post  lx545 August 19th 2009, 10:54 pm

i have a comp 312h hydraulic flat tappet and it recommends the comp 928 springs, my problem is they are 160#@1.8 something, well my installed height is 2.050 which i cannot find a spring with the like specs any help would be appreciated thanks-JJ

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Post  deliveredfast August 19th 2009, 11:12 pm

You may have to shim the springs to get the 1.8 installed height.
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Post  c.evans August 19th 2009, 11:23 pm

That would be a whole lot of shims, .250" worth. I'd suggest that you do some research on the Comp Cam site and see if there is a taller spring that is still a mild spring. Then if not, what about a set of shorter valves, or I'd say use minus .050" locks and then the shims, or big washers in your case! Very Happy

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Post  bbf-falcon August 19th 2009, 11:32 pm

Are you also using spring cups?

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Post  lx545 August 19th 2009, 11:39 pm

yes i'm using spring cups ive looked on comps site nothing really that tall thats mild enough if i stretch out the shorter springs they are under the reccomended seat pressure

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Post  IDT-572 August 20th 2009, 12:03 am

Be careful going with a tall spring and short lift, you will lose needed over the nose pressure.

A 927 comp spring would probably work, but you would need to break it in with the inner out, because the open pressure would be a little high. Install it at 2.025 @160# and at .600 lift 1.425 @close to 450lb. Spring rate is 498 per inch.

Just something to look at. Could be some more.
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Post  dfree383 August 20th 2009, 2:26 pm

What heads and parts are you running that you managed to get over 2"?
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Post  lx545 August 20th 2009, 4:50 pm

procomp heads manley spring cups doug herbert 10 deg retainers and pep 2.19 1.76 stainless valves, those comp 927 look pretty good imo

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Post  DanH August 20th 2009, 6:16 pm

i got a set that can be made to work. sent you a PM

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Post  lx545 August 20th 2009, 8:09 pm

pm sent and im getting my heads flowed tomorrow so i can get a better idea of what cam i might need thanks for your help guys-
jj

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Post  bruno August 20th 2009, 8:29 pm

hey JJ if you dont mind can you post your results ...that would be sweet Very Happy

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Post  lx545 August 20th 2009, 8:46 pm

i will definetly post results hopefully i wont be to ashamed of my results first set of heads of really ported with the help of you experts, its been 6.60's @120 in the 1/8th with 545ci pump gas motor with some problems so maybe they'll do ok for a amatuer, thanks bruno

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Post  rmcomprandy August 20th 2009, 8:58 pm

The ProComp head and your valve combination is the reason. Those heads use D3VE length valves which are shorter than D0VE's or CJ's.

A NASCAR counterwound double spring from P.S.I. is the only ones to go in that tall and have the pressures you want - that spring is expensive though.

The closest CompCams which will work for you is the #935

Personally, I can't imagine ANY hydraulic which calls for a spring with 160 pounds on the seat.

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Post  lx545 August 20th 2009, 9:15 pm

i thought it was kinda wierd myself and also that cam is kinda noisy ive heard its the grind, sounds almost like a solid but looked beautiful when i took it out so i dunno what the noise was about none of my rollers were noisy so anyway.

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Post  rmcomprandy August 20th 2009, 9:19 pm

lx545 wrote:i have a comp 312h hydraulic flat tappet and it recommends the comp 928 springs, my problem is they are 160#@1.8 something, well my installed height is 2.050 which i cannot find a spring with the like specs any help would be appreciated thanks-JJ

What Rollers ... ?
Your post says FLAT TAPPET.

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Post  lx545 August 20th 2009, 9:28 pm

sorry ive had two roller cams in the motor

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