Poly bushes

Interesting to note a certain landy after-market company in perth complete with poly equiped display chassis in the forecourt advised me to stick with OE rubber, and they specialise in the stuff! They did have some interesting wedge shaped dislocation "pads" rather than cones made of poly though.

One advantage of poly is the ability to put in into components easily as it often lacks a steel sleeve. But then it sounds like U'll be taking it out again sooner too!

Dave

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Originally Posted by PAT303

Grimace get to the point,I'm sick of your long winded post's. Pat

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:D sorry

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Originally Posted by camel_landy

IMO - Use OE bushes, not poly.

I'd much rather replace worn out rubber bushes than replace stress fractured suspension components.

My 2c

M

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I don't see any pivot points on your average rangy/disco/landy where polybushes could make the difference between stress cracks and none.
None of them transmit vertical suspension loads.

I did for a nanosecond have poly bushes on my front shocks, before realising how stupid it was. The concern there wasn't cracking the chassis, it was bending the mounting pins.

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Originally Posted by Dougal

I don't see any pivot points on your average rangy/disco/landy where polybushes could make the difference between stress cracks and none.
None of them transmit vertical suspension loads.

I did for a nanosecond have poly bushes on my front shocks, before realising how stupid it was. The concern there wasn't cracking the chassis, it was bending the mounting pins.

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Pin mounts into chassis would be the main one.
Secondly would be the radius arms as the less load taken up between the flex in the bushes on the front diff means more load transfered into the dif housing.

And yes most definately on shock mounts - NO GOOD.

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Originally Posted by BigJon

Landcruisers will crack on central Australian roads no matter what suspension they use.

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tell me about it, i did my fair share of welding on cruisers, axle casings, chassis, window frames, inner wings battery trays the list goes on, but still love the 4.2;), even if it doesn't match the fuel consumption of a 300tdi.

Richard

Funny how poly bushes upset the original configuration of vehs,
I have done a bit of front end work ,the past couple of months on the batmobile,
it is so hard to find rubber as replacements. did the upper control arm bushes and all i could find were poly ones, eventually I found rubber ones, same for the torsion bar rubbers, poly everywhere.
even the suspension blokes I tried told me, to use rubber unless I wanted the vehicle to feel like a brick bouncing on the road, they reckoned poly didn;t have the same 'give' as rubber.

my 5 cents worth.



john

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Originally Posted by JohnE

Funny how poly bushes upset the original configuration of vehs,
I have done a bit of front end work ,the past couple of months on the batmobile,
it is so hard to find rubber as replacements. did the upper control arm bushes and all i could find were poly ones, eventually I found rubber ones, same for the torsion bar rubbers, poly everywhere.
even the suspension blokes I tried told me, to use rubber unless I wanted the vehicle to feel like a brick bouncing on the road, they reckoned poly didn;t have the same 'give' as rubber.

my 5 cents worth.



john

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and again I say it depends on the durometer of the material.
Most poly bushes are designed for a 'sporty' or 'performance' feel, hence they are stiffer than stock and usually unsuitable for a 4WD.

Having talked a number of times to the engineers at Fulcrum/Super Pro, they are aware of how 4WD's are used and formulate the material accordingly. They then test them, and in the case of Land Rovers it is via a well known Land Rover workshop down the road that does everything from tourers to comp vehicles to rock crawlers.
I still maintain that the Super Pro lower rear trailing arm-chassis bush is the best available for an A frame coil rear end Landy. The design is so much better than OE in that it reduces bump steer while allowing better articulation.
I'll dig up a photo tonight.

Rick have you got them fitted to your truck?How much and were from?.I have noticed that the fender ''skittles'' across dirt roads where the disco that has rubber bushes is alot more stable.I'm starting to agree about the hardness of poly is upsetting the back end big time. Pat

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Originally Posted by Grimace

Pin mounts into chassis would be the main one.
Secondly would be the radius arms as the less load taken up between the flex in the bushes on the front diff means more load transfered into the dif housing.

And yes most definately on shock mounts - NO GOOD.

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By pin mounts you mean the front radius arms and rear lower arm mounts?
These don't take any significant vertical load. Horizontal the biggest ones are braking, unless you're driving into square edged ditches at speed.

If you're doing that then the difference in elasticity between rubber and poly isn't your biggest concern.

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Originally Posted by JohnE

Funny how poly bushes upset the original configuration of vehs,
I have done a bit of front end work ,the past couple of months on the batmobile,
it is so hard to find rubber as replacements. did the upper control arm bushes and all i could find were poly ones, eventually I found rubber ones, same for the torsion bar rubbers, poly everywhere.
even the suspension blokes I tried told me, to use rubber unless I wanted the vehicle to feel like a brick bouncing on the road, they reckoned poly didn;t have the same 'give' as rubber.

my 5 cents worth.



john

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Both my Kingswood utes have had aftermarket poly type bushes right through the suspnsion and I never thought the ride was too harsh or it was wearing / damaging components. Horses for courses I guess. My Rangie has all genuine LR rubber bushes.