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Old 01-13-2009, 12:29 PM
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polyurethane vs delren

hey guys
have any of you used delrin for bushing material. on a four link? does any body have any input?

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Old 01-13-2009, 12:54 PM
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The polyurethane is fine to use in a 4 link if you are just going up and down. If you set the vehicle up for side movement as well, jeeps, offroad trucks, then delrin would be better suited. The delrin is a heavier duty use, but also stays smoother over the long run.
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Old 01-13-2009, 03:00 PM
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One of the things that can be a problem (even with soft rubber) is the lack of deflection. You can have negative side effects during articulation if the bushings can't give.

So it depends on the type of 4-link and the intended use. If you're just a 1/4 mile drag racer, then its not a big deal, but if you're looking for handling and ride quality, delrin and poly aren't the wisest choices.

OEMs design their 4-links with trailing arms that easily twist to compensate even with stock rubber bushings.

If you're going as far as Delrin and are willing to put up with the noise and harshness, consider spherical bushings (heim joints) which allow for full movement through the articulation.
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Old 01-13-2009, 03:08 PM
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I'm with Curtis on this. Delrin will bind up a suspension not allowing the body to roll or the axle to articulate. Poly isn't much better. For drag race only where you won't have any body roll it isn't a problem. For a street vehicle you want the suspension to move without binding. If that is the case go with big soft rubber bushings or something with a spherical pivot. If you want something spherical check out my posts in this thread.
heim joint or bushings ?
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Old 01-13-2009, 07:26 PM
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Quote:
Originally Posted by maninacoupe
hey guys
have any of you used delrin for bushing material. on a four link? does any body have any input?
4-link as in OEM triangulated, or as in 4-link equal length drag setups?
Daily driver street, or weekend warrior, or race? Be honest with yourself.

Each material has it's merits, let's not get ahead of ourselves.
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Old 01-13-2009, 09:38 PM
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Another important but often overlooked point on this situation is the actual design of the bushing itself and not the material it is made of.

And, as C-10 mentioned the type of four link is also an important factor in choosing the material and design.

So to make a long story short we need to know what type of four link you will be running
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Old 01-14-2009, 07:28 AM
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Thanks for the input guys. I am going with the triangular four link setup. There was a mention of heim joint. Was you saying this would be better? The only reason I was asking about the delrin was I have access to all I need for that best price.FREE. And it is machinable. But if there is problems, I don't need that either. So what would be best? poly,heim,delrin Oh this 31 truck is going to be a driver not a drag car. Thanks again guy. All input is appreciated
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Old 01-14-2009, 03:57 PM
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The only way to make that Delrin work would be to make spherical bushings out of it. Use it to make front A-arm bushings.

I'll stick to my prior recommendation
Quote:
go with big soft rubber bushings or something with a spherical pivot
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Old 01-14-2009, 08:23 PM
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thanks alot guys. you all have helped me once again make up my mind
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