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Bilsteins - how do they lift ?

Discussion in 'Suspension' started by JoeN 267, Jul 6, 2010.

  1. Jul 6, 2010 at 6:39 PM
    #1
    JoeN 267

    JoeN 267 [OP] Active Member

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    OK, I have read as many posts as I can find and searched the Internet to no avail -

    Mechanically, how do the Bilsteins 5100's (front) actually raise the truck - I'm just having a "brain fart" and can not see how it works -
     
  2. Jul 6, 2010 at 7:32 PM
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    Randy0802

    Randy0802 Member

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    i think they are longer and have more travel.
     
  3. Jul 6, 2010 at 7:36 PM
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    KPT

    KPT sees what you did there.

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    Incorrect.

    They actually lift the truck by raising the spring perch. (the seat that the base of the spring sits on).

    The spring compresses the same amount, but it is physically higher on the shock, therefore the truck sits higher.
     
  4. Jul 7, 2010 at 9:54 AM
    #4
    JoeN 267

    JoeN 267 [OP] Active Member

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    Thank you KPT, I kinda thought that was what was happening -
     
  5. Jul 7, 2010 at 9:56 AM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    This is kinda right. The spring perch preloads the spring, giving it more rate, thus giving lift. So, The spring is compressed a bit more than stock, depending on the setting of the perch..
     
  6. Jul 7, 2010 at 10:18 AM
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    KPT

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    Chris I'm glad you commented on that. I have always had a hard time seeing how simply moving the spring up on the shock actually compresses the spring more, but everyone says it does.

    The weight of the truck is the same, and the weight is what compresses the spring, not the spring's position.

    It's kind of like saying that if I stand on a spring on the floor, it will compress a certain amount, but if I move that spring on top of a table, the stand on it, it will compress more?

    What am I missing?
     
  7. Jul 7, 2010 at 10:30 AM
    #7
    Ace83

    Ace83 Well-Known Member

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    I think the shock's lift is just secondary like just a help to the springs to support more weight.. but its main purpose is absorb shock/dampening but it does allow you to use longer springs w/ more travel compared to stock
     
  8. Jul 7, 2010 at 10:31 AM
    #8
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    The spring is compressed against the top plate. Being as it doesnt move, when you move the spring perch up, you are adding pre load to the spring, thus increasing the spring rate, and giving lift. The more pre load, the more lift. The trade off is, as you add more pre load to the spring, the ride gets more firm.
     
  9. Jul 7, 2010 at 10:33 AM
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    KPT

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    It is only actually compressed by the top plate if the shock is topped out though right? Otherwise it's the just resting against the top plate, with the spring extending the shock different amounts based on where the perch is.
     
  10. Jul 7, 2010 at 10:37 AM
    #10
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    Its compressed by the spring perch. The amount of pre load on the spring has no affect on the amount the shock extends.
     
  11. Jul 7, 2010 at 10:44 AM
    #11
    KPT

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    Alright I'm still having a hard time wrapping my mind around this....

    Springs are governed by Hooke's Law, one form of which is:

    x=F/-k

    x=how much the spring is deformed (or loaded in this case)
    F=Force (the weight of the vehicle in this case)
    -k=spring constant, which isn't going to change.

    The spring still has the exact same amount of weight on it (the weight of the truck) no matter the position of the perch, so x wouldn't change.

    Sorry, I'm just trying to figure out how I'm wrong, and learn something in the process.
     
  12. Jul 7, 2010 at 10:47 AM
    #12
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    The spring is captive in the assembly. If you take that assembly, and move the perch up, thus shortening/compressing the spring, and pre loading it, asentially, more weight is placed on the spring. This gives lift. Same with coilovers. You thread the adjuster down, giving preload, increasing the spring rate, and getting lift. Compressing the spring, makes it harder for the weight of the truck to puch it down, so the truck is lifted. Not sure how else to explain this.
     
  13. Jul 7, 2010 at 10:53 AM
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    KPT

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    Ohhh, I get it now. You know what my problem was? For some reason I was thinking that the shock valving was between the top plate and the spring perch (so once you move the spring perch, the shock would just extend out by the same amount you moved the perch), when in fact the shock valving is between the spring perch and the LCA. Thanks for your help.
     
  14. Jul 11, 2010 at 5:48 AM
    #14
    isu2014

    isu2014 RAT Products

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    Wouldn't it just be better to buy a longer strut, instead of an adjustable one? It you preload the spring, it's stiffer and ride quality suffers. If I bought a strut 2" longer than stock would it lift it 2+"? Looking to level the front but I don't need adjustability and stock CA's are fine.
     
  15. Jul 11, 2010 at 6:30 AM
    #15
    AeroCooper

    AeroCooper Half the strength of ten (microscopic men)

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    The struts do not provide any lift, they only control the bounce created by the springs, which are doing the lift.

    Now, if you were able to raise the perch of the spring AND get a strut/shock with a longer travel, that may provide a more stock ride as far as the stiffness is concerned, and have that combined with a lift. Makes sense to me, but I'll leave that debate to the experts here.
     
  16. Jul 11, 2010 at 6:53 AM
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    isu2014

    isu2014 RAT Products

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    I forgot to add that I would buy the strut and spring assembly. Such as a Rancho 9000 setup.
     
  17. Jul 11, 2010 at 7:18 AM
    #17
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    A longer strut/shock will cause the suspension to over extend, breaking ball joints, or the strut itself.
     
  18. Jul 11, 2010 at 7:27 AM
    #18
    isu2014

    isu2014 RAT Products

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    So help me get this straight... If I put a longer SPRING on my stock Strut, it would lift the truck and still have the proper travel needed? No need to get longer struts unless you go long travel?
     
  19. Jul 11, 2010 at 7:30 AM
    #19
    larryde09

    larryde09 Well-Known Member

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    When it's time to replace my shocks (which is fast approaching), I've been considering the blisteins. I was thinking of using the shocks the level the front. However, everything you guys are tallking about is a concern to me...I don't want to sacrifice ride quality. If I lift the truck via increased pre-load, the truck will rider stiffer. Is this change really bad? Can you feel road bumps, is it annoying, etc?

    Also, my friend warned against lifting it because it will work the ball joints harder. Do you guys have any experience with this? Have you broken or worn out parts?
     
  20. Jul 11, 2010 at 7:33 AM
    #20
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Thor

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    Correct.
     
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