[Healeys] Suspension bushings

Michael Salter michaelsalter at gmail.com
Wed Oct 21 14:08:48 MDT 2015


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 :-))

On Wed, Oct 21, 2015 at 2:49 PM, Bob Spidell <bspidell at comcast.net> wrote:

> Which reminds me of something I've wondered about:  Since the original,
> steel/rubber bushings were 'locked' in place and twisted with the A-arm
> movement should PU/nylon bushings be lubricated  (which would defeat the
> purpose of having the bushings twist with suspension travel?
>
> ------------------------------
>
>
> The standard PU bushes are fine. When fitting they have to be lubricated
> profusely. There should be no fear of cracking etc. They may be a bit
> harsher, but new rubber bushes would be as well. The harder varieties are
> more for track use and may be a bit to harsh for everyday use.
> If you are afraid of cracking fit softer PU or rubber bushes to the shock
> absorbers. Keep the PU bushes lubed regularly with silicone lubricant, that
> will keep the squeaking and groaning at bay.
> It will make the handling a bit sharper, but do not expect miracles.
>
> Kees Oudesluijs
>
>
>
> Op 21-10-2015 om 16:12 schreef Mitch:
>
> Hello list,
>
> I would like to hear the collective wisdom.............on suspension
> bushings
>
> About a year ago I bought all the bushes  (SuperPro brand) to rebuild my
> rear suspension........I am getting ready to install them soon...... I was
> also going to order my front suspension too from (SuperPro)   BUT, I did a
> little reading last night  ....Michael Salter's site,etc,etc.    Now I am
> not so sure about poly urethane bushes verses  rubber.......The SuperPro
> bushes I bought already were expensive...........but its a fair job to
> replace them....only to have a harse ride, sqeaks ,groans, cracked frame
> etc,etc,
> When I bought the SuperPro bushes ....someone do not remember who told me
> they were the best....so I bought them
> So what is the BEST bushes and who sells them??   will the SuperPro be
> alright for the rear? or not?
>
> Thanks for any help
> Mitchell
> 1966 BJ8
>
>
>
>
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-- 
*If you can't fix it with a hammer, you've got an electrical problem.*
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