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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