Valve Spring Maintenance
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Valve Spring Maintenance

  1. #1
    Senior Member VDRIVERACING's Avatar
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    Default Valve Spring Maintenance

    How does one check valve springs while on the engine? I presume that over time they start to shrink/collapse incrementally. How do you keep an eye on this process, and what is the tolerance at which point you replace?

    I have a full roller cam, about 650 lift range....

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  3. #2
    mo balls than $cents$ IMPATIENT 1's Avatar
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    this is what i use, just turn the motor till the rocker is fully backed off the valve, put on the tester, start pulling on it till the valve breaks open, look and see at what pressure it cracked over at(that's your seat pressure). then you can start doin the valve open pressure test, its all in the instructions

    http://store.summitracing.com/partde...5&autoview=sku

    i write down what the pressures are after i do my initial motor break in, then during the valve lash check, i check pressure , write that down to have #'s to compare against next time i check valve lash. once i get a spring that falls outta balance by more than 10-15lbs, i know its time for a new set. valve springs are the 1 of the most over looked performance item imo.
    Last edited by IMPATIENT 1; 02-06-2009 at 12:40 PM.

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    steelcomp was here
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    Pretty much ditto what Impatient says. Those checkers may not be exactly accurate as far as actual pressure, but they will show you a trend of losing pressure. If you have new springs, you can use one of those and make a note of what the installed pressures are and what the tool reads...then you'll always know where you stand. You're more looking for change than anything. Most "good" springs will settle in with about 10-15lbs loss. IMO, after that more than 10-15% and it's time to start thinking about replacement.
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  6. #4
    gn7
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    OR you can run em until one breaks, kicks the keepers, drops the valve, takes out the rod on the stroke AFTER the one that took out the piston, and split the cylinder wall, and hopefully the crank survives When this happens, it's a pretty good intication that you should probably toss the remaining 15.



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  8. #6
    Senior Member VDRIVERACING's Avatar
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    Quote Originally Posted by gn7 View Post
    OR you can run em until one breaks, kicks the keepers, drops the valve, takes out the rod on the stroke AFTER the one that took out the piston, and split the cylinder wall, and hopefully the crank survives When this happens, it's a pretty good intication that you should probably toss the remaining 15.
    This is a definitive method!

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