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Author Topic: Poly bushes-what are the advantages?  (Read 7503 times)
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droptop
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« on: August 29, 2013, 09:02:18 AM »

I'm rebuilding a front subframe for my spider and when it comes to replacing the bushings, should I use poly bushes or standard rubber items?
I had to use race-spec bushings in the rear of my BMW 325 as it simply shredded the standard ones and consequently ate tyres for breakfast, but that car can be under severe pressure compared to the spider which while driven briskly, is not abused and covers less than 3k miles a year.
I'm sure the poly bushes are resistant to oil leaks and that's no bad thing on a 35 year-old car bur overall, would you or wouldn't you use them?
Also, and I know I'm in the wrong section, but the same question applies to silicone coolant hoses-yes or no?
 Huh?
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lanciamad
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Marcus Robinson


« Reply #1 on: August 29, 2013, 09:13:09 AM »

Both get a vote from me.
Once you've got them, there with you for life. Much better performance products, Mark was offering different spec bushes to suit different needs at one point. Everything seems to feels a lot tighter with poly bushes and makes suspension geometry and as a result, tyre wear a lot easier to deal with.
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MattNoVAT
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« Reply #2 on: August 29, 2013, 03:40:22 PM »

BMW 3 series were notorious for ripping through rear bushes, even the M3 had the same bushes fitted as the standard cars like 318's / 320's & 325's...... Mad !!

But I'd go Poly Bushes every time now, as long as they are a decent compound.  I recently saw some terrible poly's that someone bought off Fleabay.... Prob cheap Chinese fakes!!


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droptop
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« Reply #3 on: August 29, 2013, 04:59:35 PM »

Here's a loaded question-What about the LBP ones, hmmmmmmm?
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MattNoVAT
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« Reply #4 on: August 29, 2013, 06:00:45 PM »

No issues with LBP poly bushes, they are on both my cars and I'd recommend them in a heartbeat.


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lanciamad
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Marcus Robinson


« Reply #5 on: August 30, 2013, 09:58:56 AM »

Same, proved on road and track by quite a few now...
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1989 - Lancia Delta 16v integrale
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75coupe
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« Reply #6 on: August 30, 2013, 10:21:26 PM »

The Betaboyz poly bushes I fitted in my front wishbones were good to start with but have not lasted long at all, they have compressed and now have a lot of play in them. The car has only done around 2000km but more than half of that has been on the race track with sticky tyres so they have had a lot of abuse.

I am considering fitting the standard bushes back in for now until I find harder ones or modify the wish ones altogether for rose joints or similar.
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archigraphe
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« Reply #7 on: January 24, 2014, 04:14:49 PM »

Hi, I've fit poly bush  from Mark to the car, one year past...

today the tech car controller show me the anormal play from the wishbone..... Shocked 

I ask me if the original torque for wishbone bushes is good ??

Extra torque may compress harder the bush and fix the "play" problem..

Thank you for your thinking.....

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Neil-yaj396
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« Reply #8 on: January 25, 2014, 10:34:50 AM »

Hi, I've fit poly bush  from Mark to the car, one year past...

today the tech car controller show me the anormal play from the wishbone..... Shocked 

I ask me if the original torque for wishbone bushes is good ??

Extra torque may compress harder the bush and fix the "play" problem..

Thank you for your thinking.....



I take from this that Archie's car has failed it's 'MOT' with play in the wishbone only a year after fitting new poly bushes? Doesn't sound good does it? Could they have been fitted incorrectly?
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MattNoVAT
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« Reply #9 on: January 26, 2014, 09:08:45 AM »

Also, is this the car Archigraphe uses for time trials and how many competitions / Km's  he's covered?  Would be interesting to know to understand if these poly bushes are good for road use but not ideal for competition use.

When I ran my Integrale track car there were bushes available for different applications road or competition use.  The competition bushes were more expensive but could stand the increased abuse they got, the standard ones wouldn't last five minutes if used on track.


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WestonE
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« Reply #10 on: January 26, 2014, 09:54:15 AM »

I would fit LBP poly bushes for road use with normal tuning every time. However for competition use the wishbone design is very poor with little metal to support the bushes in situ. They also bend very easily giving odd geometry. This is why I will have custom wishbones made using poly bushes from a Nissan truck. I simply need to get the parts to a suitable fabricator.

Back in the day Barry Waterhouse machined nylon over sleeves to compress and pack the bushes in situ to try to remove the torque steer with tuned engines and I had these fitted (180 BHP GC engine).

Eric   
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archigraphe
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« Reply #11 on: January 27, 2014, 10:22:04 AM »

Hi..

As I indicate to Mark, from betaparts, the bush where fit with the car , wheel on ground, with 6mdaN, as the original torque for the wishbone...
I've doing near 5000 km, in one year. the usage is road, with TSD rally. And yes the condition was hard some time....

As the car is used for Road and TSD, I think the Nylon bushes (http://www.betagr4motorsport.fr/#/pieces-chassi/3785726) are very harder....

Maybe original bushes with the long metal support is the solution.

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archigraphe
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« Reply #12 on: January 29, 2014, 07:35:53 PM »

I refit torque to 10mdaN.

I test this solution in the TSD rally saturday.
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lukasdeopalenica
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« Reply #13 on: January 30, 2014, 10:17:43 AM »

Is it no easier to say 100Nm instead of 10mdaN? Wink
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« Reply #14 on: January 30, 2014, 06:44:15 PM »

Pah - it's all johnny foreigner rubbish Wink  Should be 75 lbs ft Smiley
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Ammy
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« Reply #15 on: January 30, 2014, 08:12:33 PM »

Agreed ! ! !
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archigraphe
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« Reply #16 on: February 15, 2014, 02:11:23 PM »

Rubbish....Huh?  Humm...


Ok so as you can see on this video  Ronde door Vlaanderen 2014

the TSD rally was dirty......oups...

With the new torque the steering seems better..........but this was only for 50 km ( 31 Miles to satisfy Hawke.....  ).

I think refitting original Silent Bloc to the wishbone......
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