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What
are suspension bushes for anyway?
Suspension bushes are fitted to cars at all points where the vehicle
chassis is joined to a moving suspension component. They are fitted
to provide a noise and vibration absorbing barrier between the road
and you.
Why are they made of rubber?
Rubber acts as that sound barrier, damping out noise and vibration.
Without them cars would feel much harsher and noisier. Rubber is
also very very cheap.
Do racing cars have rubber bushes?
In general the answer is no. A lot of racing cars, especially single
seater track based cars use metal joints which do not provide any
noise absorbing. The life of these joints is measured in hours. They
are not suitable for road use. However a huge number of racing cars
still use rubber bushes. These are either production based cars
adapted for race use or rally cars where the forces on the
suspension can be so high that metal joints would break.
Can I fit POWERFLEX bushes to my racing
car?
If your race car has rubber bushes anywhere in the suspension then
fitting POWERFLEX bushes will improve all aspects of it's handling.
They will outlast rubber by a factor of ten. They will control the
geometry much more accurately during rapid suspension movements and
they will reduce tyre wear.
Why not Nylon bushes?
Nylon is probably the worst of all worlds. When a suspension arm
moves up and down it does not move only up and down but describes an
arc. This means that, for example an inner track control arm bush
will be required to flex in two dimensions at the same time. In this
example a metal bush will allow this movement as will a rubber or
POWERFLEX bush. However a nylon bush will allow up and down movement
but 100% of the arc loadings will be transferred into the arm and
the chassis. This causes arm flexing and can easily cause premature
arm failure! Of course nylon has no vibration absorbing
characteristics at all, so all vibration is transferred up the
already highly stressed arm.
If
POWERFLEX products are this good why do car manufacturers use rubber
and not polyurethane?
Cost, availability and marketing. Polyurethane, as a raw material is
about ten times the cost of rubber plus it is more expensive and
slower to process. Car manufacturers buy a lot of components. If
Ford decided to use polyurethane bushes in their range of cars they
would need to find a supplier capable of making literally millions
of bushes a year. There is no company in the world (even EPTG Ltd)
who could make those sort of quantities. Cars are all about
marketing. As long as the standard rubber bushes work without
serious failure for two or three years then the manufacturer is
happy. Would fitting of polyurethane bushes make you buy one car in
preference to another make? Probably not.
Why do I need them then?
POWERFLEX bushes improve your cars' road holding and chassis
performance by controlling the amount of unwanted flex in the
suspension. This means your suspension is doing what it is supposed
to. It means your tyres have greater contact with the road at all
times therefore improving safety and performance. Correctly
formulated polyurethane is as good if not better at noise, vibration
and harshness suppression when compared to rubber.
I only have a fairly basic saloon, why
do need high performance bushes?
For exactly the same reason as above but with a different emphasis.
If your tyres are in better contact with the road and your
suspension movements are being controlled more accurately then tyre
wear will be dramatically reduced. We have letters of recommendation
from customers who state that they have doubled the life of their
tyres on certain cars after fitting POWERFLEX bushes. We are not
claiming that you will get this but worn bushes are dangerous and
will be costing you money due to premature tyre wear. Have you ever
taken your car into a tyre shop with tyres which are worn out on the
inner or outer edges but perfectly legal everywhere else? You assume
the tracking is wrong, but when the shop checks, it is correct. This
is bush wear. When the car is stationary the tracking is correct but
as you move and the loads increase then the tracking goes out. Come
to a stop and the tracking is right again. Worn bushes.
I love my car, it is a classic...What
can they do for me?
Another major advantage of POWERFLEX bushes is life. Rubber is a
natural product and deteriorates with age, especially on cars which
are not being used regularly. The bushes will crack on the outer
surface and soften inside. POWERFLEX bushes are not affected by
ultra-violet, petrol, oil, battery acid, water or time. Prefect for
your loved one. (And the car.)
How
much do they cost?
Typically about 5 to 8 times the cost of a standard rubber bush.
However that is not the whole story. When you consider the cost of
fitting new bushes and the fact that POWERFLEX will be the last
bushes you every fit to your car things start to look a bit better.
Then consider tyre wear, a real cost saving here. Car manufacturers
have a habit of not supplying the bushes on their own, only
supplying them complete with suspension arms. Paying £70 for an arm
when a POWERFLEX bush might cost £15 is not a good idea. And finally
as cars get older manufacturers stop supplying certain parts.
Imagine your car was off the road because of a bush failure. You go
to the parts shop and the part is "no longer serviced"! POWERFLEX
makes a lot of sense then.
Are they easy to fit?
We design all the bushes so that they can be fitted without special
tools. However sometimes it is a lot harder to remove the old bushes
than fit the new ones. If you feel you have very little mechanical
knowledge, experience, talent or tools, either ask a friend or get
them professionally fitted.
Do I need to buy the whole car set?
No, but it depends on the car. Some cars benefit more than others.
But there is a fair amount of effort involved in changing bushes so
consider changing, for example a front set at one time, followed by
the rear ones if applicable. Best to change the whole set if you can
afford it though. (But we would say that wouldn't we!!)
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