bushes for trailingarm

Morten Blom · October 07, 2010, 10:09:55 AM

Hi

I need some new bushes for the rear trailingarms on my Murena, i kan buy them i Germany, but the price is 133 € + postage

My question are therefore; Does anybody know, if there is bushes, from an other car, that fits?

Best regards Morten Blom, Dk

Oskar · October 09, 2010, 01:27:40 PM

i believe you can have them machined in POM plastic for a much cheaper price. but it will be more suspension noise...

there no other car that shares these bushes as far as I can recal

Oetker · October 09, 2010, 03:53:28 PM

At carjoy they are € 25.- a piece ex tax, and I don't think that it is expencive.

Morten Blom · October 11, 2010, 07:29:55 AM

Hmm okay, I thought they had been used in other cars too ..
But then there is nothing else than to pay $:-\$

I can make them in POM, but I don't know if it will be good for the suspension..

Thanks for helping

Best regards Morten Blom

Anders Dinsen · October 11, 2010, 09:28:32 AM

Quote from: Morten Blom on October 11, 2010, 07:29:55 AM
I can make them in POM, but I don't know if it will be good for the suspension..

GP commented on alternative materials for these bushes here:

http://www.matrasport.dk/forum/index.php/topic,1882.msg15446.html#msg15446

Bart_Maztra · October 11, 2010, 07:29:27 PM

Make your own polyurethane bushes.

Anders Dinsen · October 12, 2010, 06:52:56 AM

Quote from: Bart_Maztra on October 11, 2010, 07:29:27 PM
Make your own polyurethane bushes.

GP advices you NOT to try it (quote from the thread I linked below):

QuoteI am using standard matra components all round on the suspension. I once fitted solid P.T.F.E. bushes in the rear trailing arms, but found these too stiff and the rear would snap away instantly. With the Matra bushes you can feel the rear end going into oversteer and it gives you more drivability.

Morten Blom · October 12, 2010, 07:56:25 AM

Hi again

I've found this compound, an I think it will be good to make the bushes!

Here is the datasheet:
http://www.cablejoints.co.uk/upload/3M_Scotchcast_Resin_2130.pdf

And a dealer with an okay price on the product

http://www.amronintl.com/products.cfm?pageID=6478

I have a lathe in my garage so I can make the steelparts on my own, so I think I can make new bushes for a good price

Out and over

Oskar · October 14, 2010, 07:17:30 PM

thats Acetal and its very hard. I dont know if its comon but one of the bushes inner ring is longer so it will allow the trailing arm to flex and steer. I guess its part of the geometry to give the arm more or less to-out when you turn to get a more safe rear end. But that is with original tires and suspension.
If everything get upgraded and lower rear end I think it wont apply anymore

Anders Dinsen · October 15, 2010, 04:01:35 AM

You are correct, Oskar.

I actually think that it becomes even more important to retain the original soft rubber components with modern low profile tyres with stiffer carcass.

I'm repeating myself (or rather Graham's advice): Don't try this, stick to the original rubber bushes, or you'll quickly find your car's rear end snapping away. Unless you're sticking to old-lady driving, but who would do that in a Murena?

Matra engineers knew what they were doing when they designed the Murena.

/Anders

Jon Weywadt · October 15, 2010, 10:54:44 AM

Quote from: Morten Blom on October 12, 2010, 07:56:25 AM
Hi again

I've found this compound, an I think it will be good to make the bushes!

Oops. Wrote my post below from my iPhone and I coud not scroll to the bottom so my text got inserted in the quote above. But now I have cut it out and pasted it below.

Unless the compound has the same "shore" value as the original, i would not use it.

A different value changes the stiffnes and range of flex, thus changing the geometry of the suspension under load.

As Anders say, it is not adviced.