Suspension Bush Material.

Author
Discussion

BogBeast

Original Poster:

1,136 posts

262 months

Monday 27th June 2016
quotequote all
I am going to try my hand at making a set of top hat suspension bushes for my bottom chassis>wishbone mount

I am googling around and have come up with a choice of:

NYLATRON
NYLATRON GS
NYLATRON GSM
Delrin
Delrin AF (although I cant seem to get this online)

There also seems to be a choice of cast or extruded rod - not sure if there is a benefit with either type.

Are there any materials I need to steer clear of? Or does anyone one have a recomendations for which of the above to use (or anything that is not on the list...)

Ta!


PhillipM

6,515 posts

188 months

Monday 27th June 2016
quotequote all
What's it for?

They're all very hard for a bush - in fact you're more of a bearing than a bush...

Nylatron is a good choice if you do want a hard bearing, but you're more likely to find Oilon stocked in places around the UK than Nylatron.

BogBeast

Original Poster:

1,136 posts

262 months

Monday 27th June 2016
quotequote all
Thanks for the reply.

Its for my Ultima - the bottom rear bush seems to suffer alot, It has eaten 2 poly bush's and I want to try something else. Comfort is not a major issue smile

I found some NYLATRON GSM Rod,on ebay, cheap enoough to have an experiment with

Dave Brand

928 posts

267 months

Thursday 30th June 2016
quotequote all
Picking up on PhillipM's comment that they are more of a bearing than a bush, with a bush there should be no movement between the bush & the metal parts on either side - movement is taken up by deformation of the bush material. If you use a hard material there will be movement between the bush & the metal parts, which are not designed to work in this way & may be subject to wear, as they are relatively soft.

PhillipM

6,515 posts

188 months

Thursday 30th June 2016
quotequote all
I would run a soft polybush with either a roller bearing or a GX sleeve inserted.

010101

1,305 posts

147 months

Thursday 30th June 2016
quotequote all
With movement inbetween the parts, wet dirt from road use gets in and acts like grinding paste.

Evoluzione

10,345 posts

242 months

Thursday 30th June 2016
quotequote all
I tried doing what you are proposing and they failed in a few thousand miles. I would be having a good look at why your existing bushes are failing or trying to get a roller bearing in there perhaps.

BogBeast

Original Poster:

1,136 posts

262 months

Friday 1st July 2016
quotequote all
Ok, thanks.

I can see that superflex do Polyurethane round bar that I should be able to turn up into a bush.

The ultima did have the option of a full rose jointed solution, so I am reasonably confident that the mounts will take any additional stress from a nylatron bearing.

(and I have just looked at the web site and they seem to offer a nylatron option now as well)

Mr2Mike

20,143 posts

254 months

Friday 8th July 2016
quotequote all
Dave Brand said:
Picking up on PhillipM's comment that they are more of a bearing than a bush, with a bush there should be no movement between the bush & the metal parts on either side - movement is taken up by deformation of the bush material.
Unless it's a polyurethane bush in which case there is movement between the crush tube and the polyurethane. They are more like a soft bearing than a metalistic bush. They are also pretty crap IME, the claims made about longevity are massively exaggerated and they have an annoying tendency to squeak.

Andy_mr2sc

1,223 posts

175 months

Wednesday 10th August 2016
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I made some bushes for my Tuscan from acetal with a S/S sleeve. It's harder than poly but not as hard or brittle as nylon. I must admit they do feel hard after the standard rubber type with more NVH but I found I could back my dampers off a click when using them. You will struggle to wear them out either. I am debating going to Poly for the above negative reasons and I do do a fair few road miles in my car but the acetal would be awesome for something more track biased.

Andy