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--001a11405a0a4a851f0522a2f21f
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@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.*
--001a11405a0a4a851f0522a2f21f
Content-Transfer-Encoding: quoted-printable
<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:comic sa=
ns ms,sans-serif;font-size:small">Bob, <br>I suspect that I'm not telli=
ng you anything that you don't already know here BUT:<br>I think the cr=
itical point is that the original suspension bushes work in the same way th=
at 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.<br></div><div class=3D"gmail_defau=
lt" style=3D"font-family:comic sans ms,sans-serif;font-size:small">The plas=
tic bushes work more like bearings in that the rotational movement is accom=
modated by rotation of the bolt (shaft) within the bush (bearing). All very=
well while you are flying straight and level.<br></div><div class=3D"gmail=
_default" style=3D"font-family:comic sans ms,sans-serif;font-size:small">Th=
e problem, as I see it, is that when angular displacement is required, as i=
n body roll, the plastic bushes must distort and as the plastic is by neces=
sity relatively rigid, when compared to the original rubber, the loads impa=
rted to the mounting points will be substantially higher than that for whic=
h they were designed. <br></div><div class=3D"gmail_default" style=3D"font-=
family:comic sans ms,sans-serif;font-size:small">Maybe you will get away wi=
th it, maybe you won't., I just don't want to be passing you in the=
opposite direction if you don't!!!!<br></div><div class=3D"gmail_defau=
lt" style=3D"font-family:comic sans ms,sans-serif;font-size:small">Michael =
S<br></div><div class=3D"gmail_default" style=3D"font-family:comic sans ms,=
sans-serif;font-size:small">BN1 #174 (All rubber bushes :-))<br></div></div=
><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Wed, Oct 21, =
2015 at 2:49 PM, Bob Spidell <span dir=3D"ltr"><<a href=3D"mailto:bspide=
ll@comcast.net" target=3D"_blank">bspidell@comcast.net</a>></span> wrote=
:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex"><div><div style=3D"font-family:Arial;fo=
nt-size:12pt;color:#000000"><div>Which reminds me of something I've won=
dered about:=C2=A0 Since the original, steel/rubber bushings were 'lock=
ed' in place and twisted with the A-arm movement should PU/nylon bushin=
gs be lubricated=C2=A0 (which would defeat the purpose of having the bushin=
gs twist with suspension travel?<br></div><div><br></div><hr><span class=3D=
""><div style=3D"color:#000;font-weight:normal;font-style:normal;text-decor=
ation:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt"><br><div>=
<br></div><div>The standard PU bushes are fine. When fitting they have to b=
e lubricated profusely. There should be no fear of cracking etc. They may b=
e a bit harsher, but new rubber bushes would be as well. The harder varieti=
es are more for track use and may be a bit to harsh for everyday use.<br> I=
f you are afraid of cracking fit softer PU or rubber bushes to the shock ab=
sorbers. Keep the PU bushes lubed regularly with silicone lubricant, that w=
ill keep the squeaking and groaning at bay.<br> It will make the handling a=
bit sharper, but do not expect miracles.<br> <br> Kees Oudesluijs<br> <br>=
<br> <br> Op 21-10-2015 om 16:12 schreef Mitch:<br></div><blockquote><div>=
<div>Hello list,<br></div><div>=C2=A0</div><div>I would like to hear the co=
llective wisdom.............on suspension bushings</div><div>=C2=A0</div><d=
iv>About a year ago I bought all the bushes=C2=A0 (SuperPro brand)=C2=A0to =
rebuild my rear suspension........I am getting ready to install them soon..=
.... I was also going to order my front suspension too from (SuperPro)=C2=
=A0=C2=A0 BUT, I did a little reading last night=C2=A0 ....Michael Salter&#=
39;s site,etc,etc.=C2=A0=C2=A0=C2=A0 Now I am not so sure about poly uretha=
ne bushes verses=C2=A0 rubber.......The SuperPro bushes I bought already we=
re expensive...........but its a fair job to replace them....only to have a=
harse ride, sqeaks ,groans, cracked frame etc,etc,=C2=A0=C2=A0</div><div>W=
hen I bought the SuperPro bushes ....someone do not remember who told me th=
ey were the best....so I bought them</div><div>So what is the BEST bushes a=
nd who sells them??=C2=A0=C2=A0 will the SuperPro be alright for the rear? =
or not?</div><div>=C2=A0</div><div>Thanks for any help</div><div>Mitchell</=
div><div>1966 BJ8</div><br></div></blockquote><div><br></div></div><div><br=
></div></span></div></div><br>_____________________________________________=
__<br>
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<br></blockquote></div><br><br clear=3D"all"><br>-- <br><div class=3D"gmail=
_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><i><font size=3D"2"><spa=
n style=3D"color:black">If you can't fix it with a hammer, you've g=
ot an electrical problem.</span></font></i><br><br><div></div><div></div><d=
iv></div></div></div></div></div>
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