Yeah, that was a pretty bad threadjack, but the subject was worthy. Well done Curly!
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I made sleeves for urethane bushings that actually pivot. I replaced all the 7/8” OD sleeves with 4340 ¾” OD Sleeves surrounded by ¾” ID 7/8” OD SAE oil/Teflon impregnated bronze bushings. Rear upper is a spherical.
Don’t have any time on them yet but they feel great I think they will work well. Now requires very little force to move the suspension up and down now. Removed like 40 lbs of static friction in the rear. Performs very close to an all Spherical setup and probably less likely to develop slop as the surface area transfering load of the bushings is much greater than that for a sperical. https://www.miataturbo.net/attachmen...ine=1424977730 |
Where do I place my order.... :)
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Originally Posted by NiklasFalk
(Post 1209994)
I've been shot down before for suggesting bronze bushing sleeves between the Poly/delrin and the center sleeve. But it would remove the binding issue and reduce the wear of the bushing material.
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Dang, Bob, that's awesome. Were they OTS parts from an industrial supply house or did you have to machine yourself?
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Originally Posted by hornetball
(Post 1210154)
Dang, Bob, that's awesome. Were they OTS parts from an industrial supply house or did you have to machine yourself?
For the cam bolt locations I have 4mm thick 7/8" OD washers made so as to better handle high clamp loads without squishing the subframe which was a conscern. |
Would you be willing to share dimensions, I may take this on as my next lathe project.
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That's awesome Bob. Aidan I will donate fundage to the effort, I want a set.
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Also just to make sure I understood it right, the sleeves have uerethane bushing inside them, which stop the binding issues, but create friction issues. By putting the sleeves inside brass bushings you are left with a bushing that doesn't bind laterally yet still can rotate freely?
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I have wanted these for as long as I saw them in Sean's rear knuckle sperical bearing thread.
Just keep in mind, I believe Bundy made this to work with his V8R control arms. You would have to make custom urethane bushings that are 7/8" ID and standard miata OD for these to work. Is this correct Bundy? |
Originally Posted by aidandj
(Post 1210163)
Also just to make sure I understood it right, the sleeves have uerethane bushing inside them, which stop the binding issues, but create friction issues. By putting the sleeves inside brass bushings you are left with a bushing that doesn't bind laterally yet still can rotate freely?
The bronze bushed inner sleeves in the urethane seems to cure the friction problem while retaining the advantages Urethane has over both bonded rubber and delrin solutions. |
Ok that makes sense. For some reason I thought the sleeves you made went around the urethane bushings. So these go inside the urethane and the copper bushing is what slides inside the bushing.
So the sleeve just needs to have the same ID as the normal sleeves in the urethane bushing kit, and then the OD needs to match the ID of the bronze bushings. What size bronze bushings are you using? Got any installed pictures? If the bronze bushing is the part sliding on the urethane bushing then why did you go for the $$$$ steel bar stock. Seems like any standard steel would work. |
i almost bought the isc offset uppers, then after researching, emilios past posts steered me away. i ended up taking his advice and make the front lower offset and couldn't be happier. with delrin in the front and rubber in the rear, binding isnt an issue
https://www.miataturbo.net/build-thr...9/#post1193050 i was going to make a thread a few weeks ago with all the dimensions of various bushings as i make them throughout the car, starting with the LCA front, but i couldnt find my napkin cad drawing in the garage. |
Originally Posted by aidandj
(Post 1210166)
If the bronze bushing is the part sliding on the urethane bushing then why did you go for the $$$$ steel bar stock. Seems like any standard steel would work. https://www.miataturbo.net/race-prep...cussion-82072/ |
I'll re-read all of that. It started to go over my head and I got bored at one point.
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Originally Posted by aidandj
(Post 1210171)
I'll re-read all of that. It started to go over my head and I got bored at one point.
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Originally Posted by hi_im_sean
(Post 1210172)
its very dry
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Bob, with the bronze bushings will lubing still be required? How long do you think these will last? Will the bronze wear at some point?
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Originally Posted by aidandj
(Post 1210166)
Ok that makes sense. For some reason I thought the sleeves you made went around the urethane bushings. So these go inside the urethane and the copper bushing is what slides inside the bushing.
So the sleeve just needs to have the same ID as the normal sleeves in the urethane bushing kit, and then the OD needs to match the ID of the bronze bushings. What size bronze bushings are you using? Got any installed pictures? If the bronze bushing is the part sliding on the urethane bushing then why did you go for the $$$$ steel bar stock. Seems like any standard steel would work. |
Ok so the sliding surface is the steel sleeve and bronze bushing, that makes more sense.
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