[Healeys] Suspension bushings - tangent

Oudesluys coudesluijs at chello.nl
Fri Oct 23 04:32:50 MDT 2015 

I did not realise that the tie rod was orientated front/rear. In that 
case you are absolutely right.
These rods are more usually used to prevent torsional movement of the 
engine to keep clutch judder (amongst others) in control. I those cases 
I would go for rubber bushes.
Kees Oudesluijs



Op 23-10-2015 om 4:27 schreef WILLIAM B LAWRENCE:
> I think I disagree. The main purpose of the tie rod is to keep the 
> engine from shifting forward and damaging the radiator. It has very 
> little function as a shock absorber. Its orientation to the engine 
> center line means there is little vibration in that direction. On the 
> other hand the rubber bushings fail very quickly on exposure to oil 
> and water. if the bushings fail and allow the engine to move forward 
> under braking it can do some substantial damage. I think Austin 
> probably would have used a more durable material in that place if one 
> had been available (and economic). My car is not concours and never 
> will be so my emphasis is going to be on durability. I'm definitely 
> going to urethane for this application.
>
> Bill Lawrence
>
> > To: healeys at autox.team.net
> > From: coudesluijs at chello.nl
> > Date: Thu, 22 Oct 2015 12:14:23 +0200
> > Subject: Re: [Healeys] Suspension bushings - tangent
> >
> > 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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