Valve Spring Life Expectancy
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Valve Spring Life Expectancy

  1. #1
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    Default Valve Spring Life Expectancy

    Heres the story, i`m running a 496 chevy, JE pistons with BB2-plus cnc ported heads, one 1150 Barry Grant dominator carb. camshaft duration is 311/315, @ .050 is 280/284, lift is .757/.757 with a 7-4 firing order swap. springs are 1.635 O.D. 280# @2.00, 850# @1.150, bind 1.070. titaniun retainers with 10 deg. locks. i have about 50-60 passes on these springs. the boat runs consistent O`s in the 10 sec. class. now heres the problem, last week i was going to adjust the valve lash before going to the Poplar Bluff, Mo. race. i found a broken spring on the #4 intake. it probably broke on my last pass of 2007. these are double springs and both of them were broken. i replaced the spring and went to the race. on my first qualifying pass the boat stumbled at the starting line and it ran a 10.25 E.T. on the second pass i cut a .177 light and all was going well until it fell off about 3/4 track. this pass was a 11.40. after getting back to the pit and pulling the valve covers i found 5 more broken springs. the #6 intake valve had its keepers and retainer knocked completely off but the stem is still about 3/4 inch visible but frozen in its guide. i`m lucky it did`nt completely drop. hopefully the seat and guide is`nt screwed up too badly. i havent pulled the head yet. i`ve never loosened the spring pressure during the off season but i do bump the motor over about once a month. now my question is; how long is the life expectancy of these springs? what do you guys do during the off season? these are Manley springs and now i`m thinking maybe Comp. Any recommendations or questions? i`m all ears and thanks in advance. richard..........

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    IM Amatuer opinion, you are pushing the snot outta those springs and probably should replace them every year. How many seasons was "50-60 passes"?

    I think you have your answer. They'll last 50 to 60 passes before they start breaking.

    You got a warning with the ONE that broke, than ran it more. Hope nothing really bad got damaged.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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    Harmonics.....

    What's the open pressure you run is it 850#'s. Wow.

    What do you rev it to ?

    Try Isky Tool Room's or a Comp or Crower equivalent. http://www.performanceboats.com//sho...ring+harmonics

    Look at post #27



    Sleeper CP
    Last edited by Sleeper CP; 05-22-2008 at 06:41 PM.

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    Smokin, i think you`ve hit the nail on the head. i got my warning but did`nt take heed. Sleeper, i really never thought about harmonics. the motor is truning 6500 rpm at wot. the spring pressure is 850# @ 1.150 . i`m figuring with a .757 lift cam minus the .020 valve lash, its depressed to 1.263 so i really do`nt know what the spring pressure is at full lift. sure wish i had a pressure tester but those things are outta my reach price wise. looks like i`ve got some homework to do and will loosen those things off during the winter. thanks guys for the replies.

  7. #5
    gn7
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    these will prolly out last your boat
    http://www.iskycams.com/productdispl...=101&dealer=no
    3 seasons in a blown circle boat spinning more R's and have not more than 15 lbs ----killed a set of Manely Nexteks in 3 races



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    Quote Originally Posted by gn7 View Post
    these will prolly out last your boat
    http://www.iskycams.com/productdispl...=101&dealer=no
    3 seasons in a blown circle boat spinning more R's and have not more than 15 lbs ----killed a set of Manely Nexteks in 3 races
    I've said it before: There's a reason those springs cost so much....they are worth it.

    Unless you are running a 180 gram intake valve or something like that, those spring pressure's seem excessive for a 6,500 rpm engine Because that cam is not all that wild, I don't think ?

    I'm glad gn7 has had the same experience as I have had with the Isky Tool room line.

    Sleeper CP

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    Senior Member ol guy's Avatar
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    Quote Originally Posted by Richard Till View Post
    Heres the story, i`m running a 496 chevy, JE pistons with BB2-plus cnc ported heads, one 1150 Barry Grant dominator carb. camshaft duration is 311/315, @ .050 is 280/284, lift is .757/.757 with a 7-4 firing order swap. springs are 1.635 O.D. 280# @2.00, 850# @1.150, bind 1.070. titaniun retainers with 10 deg. locks. i have about 50-60 passes on these springs. the boat runs consistent O`s in the 10 sec. class. now heres the problem, last week i was going to adjust the valve lash before going to the Poplar Bluff, Mo. race. i found a broken spring on the #4 intake. it probably broke on my last pass of 2007. these are double springs and both of them were broken. i replaced the spring and went to the race. on my first qualifying pass the boat stumbled at the starting line and it ran a 10.25 E.T. on the second pass i cut a .177 light and all was going well until it fell off about 3/4 track. this pass was a 11.40. after getting back to the pit and pulling the valve covers i found 5 more broken springs. the #6 intake valve had its keepers and retainer knocked completely off but the stem is still about 3/4 inch visible but frozen in its guide. i`m lucky it did`nt completely drop. hopefully the seat and guide is`nt screwed up too badly. i havent pulled the head yet. i`ve never loosened the spring pressure during the off season but i do bump the motor over about once a month. now my question is; how long is the life expectancy of these springs? what do you guys do during the off season? these are Manley springs and now i`m thinking maybe Comp. Any recommendations or questions? i`m all ears and thanks in advance. richard..........
    Hey guys, Just an old guy here responding to a problem Iv'e heard many times in the past, take it for what it's worth!!!! Driver A takes boat for last romp of the year and has a great time. Boat b gets parked in garage and kissed good-night till it warms up. Driver A wakes boat up after a good long sleep and Boat B has valve train problem. Now comes the fun stuff. Boat A has sat and not turned a revolution for awhile. Meanwhile the valves have stayed adjusted and ready for your'e wake-up call! If you turn the motor over on occasion, great but did the motor warm-up to operating temp? In valve adjust you will have some open some closed and some in limbo. It maybe a pain in the a$$ for some,but if you back of the adjustment of the lifters, springs and valve train it will last alot longer!!! Just something to think about. M

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    Its been overdo for a while. Time to invest in a spring checker.

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    As much lift and spring pressure as you are running, un-loading them in the off-season would be a great thing to do.

    I don't do mine, BUT, I'm not running anywhere near the setup you are.

    If you know your closed pressure (on the seat), and know the per-inch spring rate, you can calculate close enough your wide open pressure.

    The "850# at 1.150" " is really pretty useless.

    As an example, I run 150# seated, 400#/inch Isky springs, .565" lift.

    Calculator says: aprox. 376 pounds full open.

    Whether this is worth a damn or not:
    From the 2" and 1.150" measurements,

    280# @ 2" height.
    850# @ 1.150" height.
    .850" spring stroke.
    570 pounds change in that .850" stroke.

    math says:
    670 pounds (and change) per inch spring compression.

    What is the installed height of the springs, and, if possible, the seated pressure?
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

  12. #10
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    the installed height is 2.00 and the spec. card says 280 lbs. they are/were manley nextek springs. i paid $240.00 for them in early 2005.

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    OK, 280# seated.
    670# per inch.
    787# at full lift (roughly).

    I'm thinking the Tool Room Spring advice is good. That's a mean setup in my world. Going to take pretty top-dollar springs to live long at that, and back the adjustment to zero in the off season and forget starting it.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
    H.L. Mencken

    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

  14. #12
    Senior Member ol guy's Avatar
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    Quote Originally Posted by Richard Till View Post
    Heres the story, i`m running a 496 chevy, JE pistons with BB2-plus cnc ported heads, one 1150 Barry Grant dominator carb. camshaft duration is 311/315, @ .050 is 280/284, lift is .757/.757 with a 7-4 firing order swap. springs are 1.635 O.D. 280# @2.00, 850# @1.150, bind 1.070. titaniun retainers with 10 deg. locks. i have about 50-60 passes on these springs. the boat runs consistent O`s in the 10 sec. class. now heres the problem, last week i was going to adjust the valve lash before going to the Poplar Bluff, Mo. race. i found a broken spring on the #4 intake. it probably broke on my last pass of 2007. these are double springs and both of them were broken. i replaced the spring and went to the race. on my first qualifying pass the boat stumbled at the starting line and it ran a 10.25 E.T. on the second pass i cut a .177 light and all was going well until it fell off about 3/4 track. this pass was a 11.40. after getting back to the pit and pulling the valve covers i found 5 more broken springs. the #6 intake valve had its keepers and retainer knocked completely off but the stem is still about 3/4 inch visible but frozen in its guide. i`m lucky it did`nt completely drop. hopefully the seat and guide is`nt screwed up too badly. i havent pulled the head yet. i`ve never loosened the spring pressure during the off season but i do bump the motor over about once a month. now my question is; how long is the life expectancy of these springs? what do you guys do during the off season? these are Manley springs and now i`m thinking maybe Comp. Any recommendations or questions? i`m all ears and thanks in advance. richard..........
    Hey R/T. just another brain fart, When the heads were set up was coil bind checked for that much lift???????????? M

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    ol guy, the spring specs said that the bind height was 1.070 i`m thinking with a .757 lift minus the .020 lash adjustment i am compressing to 1.263 leaving .193 before bind. i`ll definately never buy manley springs again. i had one spring broken from last year and replaced it but 5 more broken springs in two runs? the guy i bought them from was on vacation last week. we`ll have a serious talk in the morning. i`m now thinking isky springs since they are so highly recommended.

  16. #14
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    Default OK flame away.........

    In the PS89 boat we run an Engle cam, springs, retainers........Two years ago we replaced the springs...........AFTER 15 YEARS!!!!!!!!!........Engle did a test, one year, fully collapsed in a vice in the backyard.....NO difference. We ran Engle springs for two decades, dropped 300 rpm. For $100. Engle replaced the springs, newer version, 225 on the seat, Rs came right back.......I never back them off, maybe I should just to seal the engine, but never have. 2 decades of circle racing without a valvetrain failure, go figure!...........That says a lot for Engle Cams..........I'll never use anything else, even free.......Ray
    LOUD BOATS SAVE LIVES

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