MatraSport Forum

Does anyone supply polyurethane suspension bushes for the Murena and if so has any one tried them?

John

Simon has some for the lower bushes on the front shocks. Look here (scroll down at bit):
http://www.simon-auto.de/matra/englisch/mur_tuning.htm

Why are you considering PU bushes?

- Anders

there is an article in a german magazine about making your own poly bushes.  If you are interested, i can scan it and post it.

Hi Anders and Bart

I am just considering tightening the suspension setup but I do not want to change the spring rates.

I would be very interested to see the article on making your own PU bushes.

Thanks

John

I asked simon about the availability of Pu bushes for the murena (other then the ones he carry) and as far as he is aware no one make them for these cars.

Those for the shocks wont make much of a difference. I use them on my car (the old ones were too far gone) but i cant really tell that they are different.

as for Pu bushes in general... I'd say they are only for racing .. ..and good quality stock bushes should still make a HUGE difference over 20 year old worn out ones..

and as for making bushes yourself...... well......as long as you can still obtain normal ones.. Id risk a beer(cold.. of your choice) that it's not gonna be worth the effort ... though it would be an interesting project if one is so inclined  ;)

Thanks for the info Krede; looks like it will be standard bushes then.

I am still interested to know about how to make your your own PU bushes though.

John

Hmm...
not that I have any experience with DIY PU bushes, but I know that our plastics supplier can supply PU bars, I guess all you need is a leathe and a bit of time...

I have had rubber materials machined before, it's not the easiest material to work with, but it's possible  :-\

But as Krede mentioned, possible not worth the effort...  ;)
I probably have both the material and a leathe at work, and I still wouldn't be bothered if I can still get fairly cheap orig. rubber bushes...

The DIY pu is made by mixing two liquids, and pour it in a mould.
Give me a few days to do the scanning.

ive got them on the front and rear on my car . i kept spliting them on the front coil overs and the problem has now gone away, but you will not notice the difference when driving

It's a bit late, but here it is.

(http://i3.photobucket.com/albums/y96/matramurena/polybus.jpg)

Thanks for the information, if I can find the components I will give it a try.

John

Does anybody speak enough german to be able to translate this to english....?

This is the website:

http://www.heinrici-klassik.de/start.php (http://www.heinrici-klassik.de/start.php)

http://www.heinrici-klassik.de/start.php?d_2421_Urethan906.php (http://www.heinrici-klassik.de/start.php?d_2421_Urethan906.php)


A short translation:

You need to get an innertube, which is exactly the same as the original. Same lenghth and diameter and wallthicknes. You might have to make it on a lathe.
You also need an outher tube.  If the outhertube is part of the bush, it needs to be exactly the same as the original.  If the outher tube is not part of the bush, you need it anyway as a mold.  In that case the inner diameter is important. Apply some silicon spray on the inside, so the polyurethane will separate easily.

Use a magnetic plate to hold the tubes in position.

Mix the polyurathane and the hardener at a rate of 1 to 0,35. Mix it for 4 minutes slowly (to prevent incloser of air). Then you can apply it for 20 minutes.
Setting will take 4 hours, but it needs 8 days before it can be used!

One package contains 810 gram which cost about 50 euro. One bush needs about 15-20 gram so that will cost about 1,50 euro. Add the costs for the tubes.

Well.. it does sound tempting...
My concern would be the quality of the rubber... and how well it will adhere to the steel parts.

id do it if I could find any tubes in right diameter  ???

After going through this topic and seeing the condition of the bushes on my car I do not want to change them to PU bushes.
But the bushes of the anti roll bars, hmmm... I have to change them.
Has anyone tried something like this:

http://www.ebay.co.uk/itm/Universal-anti-roll-bar-ARB-poly-u-d-bushes-mounting-brackets-pair-19mm-ID-NEW-/360376930666?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item53e823916a

These will move the front anti roll bar forward and put extra pressure on the drop links and distort the bushes to much

They will be mounted lower and a bit more forward. And you will need to compensate for the fact that the front bushes are round not D shaped. You will probably also need to shorten the stack of rubber bushes. But it might work. Let me know how things workout i can use a few new once myself.

(http://i1139.photobucket.com/albums/n544/wobbe98/div/Stabilisatorstangrubberenbeugeljpg.jpg)

No, I thought it for the rear ARB which looks the same. As uberprutser mentioned the front bushes has different shape.
And of course I do not want to modify the suspension. Matra engineers were much more clever than me... :)

I only wanted to know if anyone has experience of PU bushes for the anti roll bars. Maybe those have longer life than rubber ones. Other bushes are in quite good condition on my car so I have to change the ARB bushes only. Before buying new ones I wanted to collect some info.

The problem with rubber bushings is that the vulcanizing process never quite stops causing them to harden over time. PU bushings are not subject to such a process as far as I know. On the other hand, some synthetic materials disintegrate over time and perhaps that could happen to PU bushings. Moral, keep an eye on the bushings and replace them if needed.  ;D

I would recommend the modifying the front brackets as shown in the picture below.
When you look a the bracket in my previous post you can see that it is a bit warped.
I hope that this reinforcement will prevent this from happening again.

(http://i1139.photobucket.com/albums/n544/wobbe98/div/Bracketmod.jpg)

Could anyone send me some photos of the front anti roll bar outer bushes? I found a photo on Carjoy's webpage, but I have totally different ones. Which is the original? How should it look?
I would be grateful for dimensions...
Thanks in advance.

Hmm, this is what my original ones looked like when I disassembled them this summer. I do not have a picture of the new ones I brought from Simon, but I do believe they were identical to the old ones.
(http://img198.imageshack.us/img198/9352/dsc1581j.jpg) (http://imageshack.us/photo/my-images/198/dsc1581j.jpg/)

Your old ones look more like a shock bushing....
http://www.matrasport.dk/forum/index.php/topic,898.msg18133.html#msg18133 (http://www.matrasport.dk/forum/index.php/topic,898.msg18133.html#msg18133)

Thanks for the photo.

Are there any other cars whiches use the same inner bushes for the anti roll bars?