hi

What kind of suspensionbushes
is everybody using on an locost;
(rubber)
from what car?
i want to use them as antivibration bushes on my bec indy


bye,
koen ( netherlands)

I think many use PU bushes. If you need rubber ones and size isnt important, start with any common ones and work from there. Triumph herald bushes are recommended in the book so these should be available fairly easily...

dont know how well they damp vibrations though in comparison to any other ones.

If you want the bushes to isolate feedback from the road, then Metalistic (rubber) bushes from the likes of said Triumph would do. Metalastic bushes were made for just about every conceivable vehicle at one time, so if the Triumph ones don't suit the tube that's available, search through old catalogues/motor factor for bushes that do fit.
PU is virtually indestructable, and will outlast any rubber ones by far. The type of PU most commonly used for these bushes, is normally 70 or 80 shore (harder than rubber), so therefore, wont absorb as much vibration.
Metalastic bushes can be a real pain in the 4rse to replace, once they become worn. They invariably bond themselves to the parent metal, and then need to be burnt out, destroying any painted finish on the wishbones.

How does the 'shore' rating system work, ie does a larger number indicate a more resistant material. Also is it possible to give a shore rating, (or an aproximation of) to a metalastic bush?

Mick

We are going to try to use the rubber bushes from Volvo 120 ('60) and early 140. They comes without any tubes and are wider and shorter than the Triumph bush. They are still easy to find here in Sweden and attractively priced, a set of 4 is a little over 3£

Cheers Leif.

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How does the 'shore' rating system work, ie does a larger number indicate a more resistant material. Also is it possible to give a shore rating, (or an aproximation of) to a metalastic bush?

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70 and 80 Shore-A are the most common grades used for road-going cars, so I would choose one or other of them. Obviously 80 shore would be more sport orientated. You could go as high as 100 if you bought some hollow rod and turned the bushes out of that, though they would be akin to Nylon, and would feel almost solid.


darren(SA)

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I made the mistake of making 60' rubber bushes for my susp

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We've got a rubber moulding company so they were moulded. I still have the moulds so I'll use them for the poly, (mix and pour )!

cheers
darren

I would like to use Spitfire rubber bushings for a good ride and low noise. The handling couldn't be too terrible for a road car, as the Spit was a sports car after all.

Rorty's comments are giving me pause, though. Going through all that every two or three years, plus a wheel alignment, would be a PITA, so I'm considering PU rated 75-80 duro.

Some manufacturers of insanely expensive PU bushes claim that their products deform like rubber, while the inferiors don't. I'm not sure how much of this is hype; if anyone knows for sure I'd like to hear about it.

DuPont has a Delrin (grade AF) that is 1/3 Teflon in composition so it never needs lubing, and is rated 83 duro. This is slightly hard for my taste, but probably perfect for someone who will race occasionally.

Pete

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How does the 'shore' rating system work, ie does a larger number indicate a more resistant material. Also is it possible to give a shore rating, (or an aproximation of) to a metalastic bush?

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pbura:

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DuPont has a Delrin (grade AF) that is 1/3 Teflon in composition so it never needs lubing, and is rated 83 duro. This is slightly hard for my taste, but probably perfect for someone who will race occasionally.

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I use quite a lot of Acetal, but bushes made from it have absolutely zero flex, so you'd need to be perfectly sure your wishbone pivots were on the same axis.
Think of it as metal.

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