Make Your Own Damn Motor Mount
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Northstar Engines and System Technical Discussion Discussion, Make Your Own Damn Motor Mount in Cadillac Engine Technical Discussion; Now, several of you have worked hard developing a custom motor mount so I don't want to trivialize your efforts, ...
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    kckranz's Avatar
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    Make Your Own Damn Motor Mount

    Now, several of you have worked hard developing a custom motor mount so I don't want to trivialize your efforts, but this article suggests you can make a half-decent mount yourself using basic tools and skills:

    http://www.nicoclub.com/articles.php?id=215490

    Tools:

    - Wire brush
    - Grinder or Dremel with cutting wheel

    Materials:

    - (2) plastic cups (the cheap kind)
    - (1) 1-lb container of Flexane 94 (order online)
    - (2) 4" 12x1.25 allthread rods (Ace Hardware has them)
    - (4) motor mount nuts (or any other 12x1.25 nuts)
    - (2) flat washers
    - Brake parts cleaner

    Procedure:

    First of all, take your 2 pieces of allthread and thread the nuts and washer onto them, making sure they're centered on the rod like so:



    Tighten the two bolts against each other with two wrenches. Then, take your grinding wheel or Dremel and cut some notches in the washers. Don't worry about neatness, you want them to be all jagged and nasty-looking:





    Next, break out the cheap plastic cups. The size of cup will determine the diameter of your motor mount, so choose wisely. Or, just grab the cheapest crap they have.



    Make a hole in the bottom center of each cup, slightly smaller than the allthread rod, and thread the rod through it from the inside:





    Make a mark on the cup the height that you want the motor mount to be. You can see my marks in the pics above.

    Find a "stand" to set the cups in, so the threaded rod can be suspended - I found that a spray paint can cap works perfect.

    Now it's time to mix the Flexane. The main ingredient is clear, and the catalyst, or hardening agent, is black. Follow the directions on the label, it's approximately a 3:1 (Flexane to hardener) ratio. Mix ONLY the amount you need, because you can't save the mixed product. It hardens.

    Once your mixing is done according to the instructions, pour the Flexane mixture into the cups. Try not to get it on the threads.







    Now, find a warm place to set the concoction. It doesn't really stink, so if you live someplace cold, you can set it in the house.

    It's best to let it sit 24 hours, or you can let it sit 12 hours and then put it in the oven at 150 degrees for 12 hours (which is what I did).

    Once it cools, you can tear away the plastic cup. The finished product is cool, functional, and cheap.







    Flexane has a resiliency somewhat near polyurethane, and you can experiment with different mixtures if you want it softer or harder. These should have great vibration dampening, while retaining the rigidity of a solid motor mount.

    But they're clearly superior to the OEM mounts, as they won't oxidize (like rubber) or deteriorate (like rubber).

    As far as strength, it has a hardness of 97A (Shore D scale) and a tensile strength of 2800 psi. Even at 400hp, these mounts won't see that kind of load.

    As far as heat resistance, OEM mounts begin to degrade at 160 degrees F. I added to heat shielding to mine, but I can't imagine them seeing 180 degrees consistently.

    At idle, it's a little rougher than the Nismo mounts were, but nowhere near as rough as solid mounts. The Flexane provides some nice (but firm) dampening.

    This project cost a grand total of $56, if you count the $50 for the Flexane.

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  3. #2
    Raze's Avatar
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    Re: Make Your Own Damn Motor Mount

    awesome

  4. #3
    Bonneville GXP is offline Cadillac Owners Member
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    Re: Make Your Own Damn Motor Mount

    Thanks for the info, I am going to try it, will let you guys know how it turns out.

  5. #4
    68Futura is offline Cadillac Owners Member
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    Re: Make Your Own Damn Motor Mount

    I like the idea, but i dont think you would really want to do this on a nice daily driver. I would think it would cause to much vibration

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    Re: Make Your Own Damn Motor Mount

    Very interesting. I like these kind of projects. Definitely keep us updated.

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    Krashed989's Avatar
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    Re: Make Your Own Damn Motor Mount

    With that design I don't see what the purpose of even putting rubber on it is for. It's technically a solid mount with no vibration dampening.

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    Re: Make Your Own Damn Motor Mount

    Quote Originally Posted by Krashed989 View Post
    With that design I don't see what the purpose of even putting rubber on it is for. It's technically a solid mount with no vibration dampening.
    That's not a solid mount...

  9. #8
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    Re: Make Your Own Damn Motor Mount

    I don't see it as solid either.

  10. #9
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    Submariner409 is offline If it won't run, install a sound system
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    Re: Make Your Own Damn Motor Mount

    With a pair of locknuts on top and on the bottom (not against the polymer), the engine rocks on the polymer cookie. Sort of a variation on the OEM liquid-damped arrangement. You punch it, the whole arrangement goes solid. Normal driving, the engine front rests on the cookie. BUT, more elegant would be a smooth hardened stud where the engine and frame mounts constantly rub, transitioning to the locknut threaded portion.........

  11. #10
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    Re: Make Your Own Damn Motor Mount

    Ah, I see what you are saying Sub. It would need another polymer disc on the other side of the cradle to sandwich the cradle. That would be pretty easy to make with this process.

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    Re: Make Your Own Damn Motor Mount

    Quote Originally Posted by Ranger View Post
    Ah, I see what you are saying Sub. It would need another polymer disc on the other side of the cradle to sandwich the cradle. That would be pretty easy to make with this process.
    I like where this is going and by the pictures it looks like there is enough polymer to make both (maybe more) cookies, though the write-up does not state this specifically.

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    Re: Make Your Own Damn Motor Mount

    What about cleaning and filling a ripped OEM mount with this stuff?

  14. #13
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    Re: Make Your Own Damn Motor Mount

    The use of 3M Window Weld ($11) for that exact application has been documented elsewhere. I believe a 1 lb container of the Flexane is the smallest size you can buy so you might as well go ahead and make a new mount (or two!).

    http://importnut.net/motormount.htm

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    Re: Make Your Own Damn Motor Mount

    Quote Originally Posted by STSS View Post
    What about cleaning and filling a ripped OEM mount with this stuff?
    Another good idea.

  16. #15
    STSS is offline Cadillac Owners Enthusiast
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    Re: Make Your Own Damn Motor Mount

    My current one is on its way out... maybe I'll give this a try... I've got some crazy strong epoxy I was going to use, but I am afraid it will be too hard and make it feel like a solid mount.

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