ProjectLMP
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| posted on 3/2/04 at 04:29 PM |
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question about polyurethane suspension bushes
Am I right in thinking you usually use a metal sleeve over the bolt when using polyurethane suspension bushes? Do they work by the bush rotating on
the Sleeve or similar to a metalastic bush where the bush twists? Got to admit I am a bit ignorant in this area.
Home of the Astronomicalcost Mid engined LMP project
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rontyler
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| posted on 3/2/04 at 04:38 PM |
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"Am I right in thinking you usually use a metal sleeve over the bolt when using polyurethane suspension bushes?"
Yes.
"Do they work by the bush rotating on the Sleeve..."
Yes... Its always the smaller circumference that it pivots around... all things being equal, theres less friction due to the less surface area.
Regards, Ron Tyler
"Nothing is ever accomplished by a reasonable man."
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DaveFJ
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| posted on 3/2/04 at 04:54 PM |
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oh no please....
don't start this one again....
This has been 'extensively' discussed (argued about) on numerous occasions
Do a quick search and you'll soon find a lot of answers ( usually all contradictory!)
Dave
"In Support of Help the Heroes" - Always
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rontyler
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| posted on 3/2/04 at 05:03 PM |
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I AM RIGHT!!
LOL!!!!
Regards, Ron Tyler
"Nothing is ever accomplished by a reasonable man."
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sgraber
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| posted on 3/2/04 at 05:12 PM |
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I certainly HOPE youre right, because that's how mine work. The inner sleeve is pinched against the bracket by the bolt. The bushing is
lubricated with the goo that came in the package, There are little radial slits in the urethane next to the inner sleeve that hold the lube so that it
doesnt dry out and squeak.
Graber
And yes, it's been discussed ad-nauseum@! 
Steve Graber
http://www.grabercars.com/
"Quickness through lightness"
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rontyler
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| posted on 3/2/04 at 05:22 PM |
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Sorry for the tangent, but I'm curious... I am suprised that you are using poly in a car like yours (LMP)... What's the occasion?
Thanks.
Regards, Ron Tyler
"Nothing is ever accomplished by a reasonable man."
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ProjectLMP
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| posted on 3/2/04 at 05:52 PM |
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Thanks. I remember reading a humungus thread about metalastic bushes but couldn't remember if it covered poly bushes.
I was going with spherical all around but for cost and simplicity reasons may go with poly bushes on the inboard pickup points. Don't think it
will make a big difference to handling. Radical use them on all their cars so it can't be too bad.
Home of the Astronomicalcost Mid engined LMP project
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rontyler
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| posted on 3/2/04 at 08:44 PM |
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I know your not looking for advice so, please forgive me... Ever thought about using Delrin? Its really NICE stuff to machine, is tollerant of road
grimes, petroleum, etc, and is substatially stiffer than polly.
Regards, Ron Tyler
"Nothing is ever accomplished by a reasonable man."
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malcolmstoddart
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| posted on 3/2/04 at 08:51 PM |
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try "turkite" its a mix of phosphor bronze suspended in PTFE,self lubricating and super smooth...used in CNC machine tool parts...
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ProjectLMP
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| posted on 4/2/04 at 03:24 PM |
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Ron,
I am using Delrin for some bushes on my steering system. I agree its nice to machine. However, while it appears harder than Nylon it isn't
as hard wearing. The type of nylon they use for suspension bushes is also not the usual stuff you can buy from plastics stores. I've got a
source for cheap moulded bushes (around $1.5 each) so I can't be bothered to even machine some bushes myself.
Home of the Astronomicalcost Mid engined LMP project
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