I do not think so as this also has to work as a vibration damper and
rubber is better in that respect than PU. Perhaps you can fit a sleeve
around it to protect it from oil.
Kees Oudesluijs
Op 22-10-2015 om 12:04 schreef Bob Haskell:
> Larry and Michael,
>
> Would you use urethane bushings for the engine tie rod (lower/rear
> gearbox/OD mount)? Urethane doesn't deteriorate like rubber when oil
> soaked. But it doesn't absorb as much shock loading either.
>
> Cheers,
>
> Bob Haskell
> AHCA 3000 Mk I registrar
> http://www.ciahc.org/registry_3000mk1.php
>
> On 10/22/2015 04:04 AM, Larry Varley wrote:
>> Absolutely agree with Michael here, from past experience I would
>> completely avoid urethane for any car to replace original rubber bushes.
>> Its a pity that the correct rubber bushes are not made, but I would
>> still use the reproductions rather than urethane. From an engineering
>> standpoint urethane has a totally different way of operating to what the
>> car was originally designed for, stretching rubber fixed against steel
>> surfaces is not the same as rotating urethane on a pin. Has anyone ever
>> asked any of the urethane bush manufacturers if their products are
>> approved by current auto manufacturers, or if they will accept liability
>> for any damage they will cause? I would prefer to stay with a product
>> that is as close as possible to the original specification. In closing,
>> enlighten me, do any current auto manufacturers use urethane as their
>> standard suspension bush?
>> Cheers
>> Larry Varley
>>
>> On 22/10/2015 7:08 AM, Michael Salter wrote:
>>> Bob,
>>> I suspect that I'm not telling you anything that you don't already
>>> know here BUT:
>>> I think the critical point is that the original suspension bushes work
>>> in the same way that rubber engine mounts are designed to work. The
>>> steel mounting plates (or in the case of mounts steel tubes) are
>>> rigidly attached to parts that move relative to each other and that
>>> movement is accommodated by the flexing of the rubber medium bonded to
>>> each plate.
>>> The plastic bushes work more like bearings in that the rotational
>>> movement is accommodated by rotation of the bolt (shaft) within the
>>> bush (bearing). All very well while you are flying straight and level.
>>> The problem, as I see it, is that when angular displacement is
>>> required, as in body roll, the plastic bushes must distort and as the
>>> plastic is by necessity relatively rigid, when compared to the
>>> original rubber, the loads imparted to the mounting points will be
>>> substantially higher than that for which they were designed.
>>> Maybe you will get away with it, maybe you won't., I just don't want
>>> to be passing you in the opposite direction if you don't!!!!
>>> Michael S
>>> BN1 #174 (All rubber bushes :-))
>>>
>>
>>
>>
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