Re: Installing poly bushings
Posted: Mon Dec 31, 2012 10:57 pm
For optimum performance of urethane bushes, one of the most important
components is the stainless crush tube, this tube controls the amount
of pressure or "squeeze" applied to the inserted bushings.
The bushes are easy to insert (A light press fit) when made as top hat
sections IE, two halves inserted from each side, followed by the crush tube,
and yes insert using a good quality grease.
The crush tube is used to fine tune the fit and operation of the bush in
the suspension ferule, IE, the tube is machined so that it is just a few
thou wider then the bush, but the fit is kind of done by feel,
not to loose, not to tight, we use special bench tuning tools
to help to achieve that state.
Our S2 elan has been running urethane bushings through out the
car since 1985, and have only changed two bushes in the front
suspension during that period.
I don't think urethane bushes make the elan any harsher than
normal, if anything, urethane bushes make the handling sharper
and more responsive.
But if you intend to fit urethane or poly bushes as you guys call
them, be prepared to spend the time for correct fitting and fine
tuning, otherwise you might as well not do the conversion.
The shots below show urethane bushes inserted into outer
rear suspension.
The urethane bushes when inserted correctly rotate on the
stainless tube insert during the arc movement of the suspension,
they don't have torsional flex as per the original rubber bonded
metalastic bushes.
There is quite a lot of work involved in changing from the old rubber
bushings to urethane, but in my opinion, it is worth the effort, but
it wont suit everyone.
The bushings are not moulded but machined from solid rod,
and feel this method produces a more exact fit than moulded
bushes, it is an advantage to be able to do all of this work
in house, and not have to farm the work out.
Good luck.
components is the stainless crush tube, this tube controls the amount
of pressure or "squeeze" applied to the inserted bushings.
The bushes are easy to insert (A light press fit) when made as top hat
sections IE, two halves inserted from each side, followed by the crush tube,
and yes insert using a good quality grease.
The crush tube is used to fine tune the fit and operation of the bush in
the suspension ferule, IE, the tube is machined so that it is just a few
thou wider then the bush, but the fit is kind of done by feel,
not to loose, not to tight, we use special bench tuning tools
to help to achieve that state.
Our S2 elan has been running urethane bushings through out the
car since 1985, and have only changed two bushes in the front
suspension during that period.
I don't think urethane bushes make the elan any harsher than
normal, if anything, urethane bushes make the handling sharper
and more responsive.
But if you intend to fit urethane or poly bushes as you guys call
them, be prepared to spend the time for correct fitting and fine
tuning, otherwise you might as well not do the conversion.
The shots below show urethane bushes inserted into outer
rear suspension.
The urethane bushes when inserted correctly rotate on the
stainless tube insert during the arc movement of the suspension,
they don't have torsional flex as per the original rubber bonded
metalastic bushes.
There is quite a lot of work involved in changing from the old rubber
bushings to urethane, but in my opinion, it is worth the effort, but
it wont suit everyone.
The bushings are not moulded but machined from solid rod,
and feel this method produces a more exact fit than moulded
bushes, it is an advantage to be able to do all of this work
in house, and not have to farm the work out.
Good luck.