About Suspension Bushes

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What are Suspension Bushes?
A bush or rubber bushing is a type of vibration isolator between two parts, damping the energy transmitted through the bushing.

What are Suspension Bushes made of?
Bushes are either made of rubber or, more often, synthetic rubber or polyurethane.

What do Suspension Bushes do?
Suspension Bushes separate the faces of two metal objects while allowing a certain amount of movement. This movement allows the suspension parts to move freely, for example, when travelling over a large bump, while minimizing transmission of noise and small vibrations through to the chassis of the vehicle. A rubber bushing may also be described as a flexible mounting or anti-vibration mounting.


Advantages of Bushes
The main advantage of a Polyurethane bushing, as compared to a solid connection, is less noise and vibration is transmitted. Another advantage is that they require little to no lubrication.

Disadvantages of Rubber Bushes
Rubber bushes can deteriorate quickly in the presence of oils (e.g., motor oil, mineral oil) and extreme heat and cold.
The flexibility of rubber also introduces an element of play in the suspension system. This may result in camber, caster, or toe changes in the wheels of the vehicle during high-load conditions (cornering and braking), adversely affecting the vehicle's handling.


Why are polyurethane bushes better than the standard rubber bushes?
Popular aftermarket performance upgrade is the replacement of rubber suspension bushes with bushes made of more rigid materials, such as polyurethane. Polyurethane bushes are also available for many vehicles with the same characteristics as the manufacturers' original bushes, but with greatly increased durability. This is useful on vehicles that have a reputation for wearing out standard rubber bushes, but for which harder bushes with increased harshness of ride are not wanted.


In vehicles:
Sway bar links and mountings
Shock absorber mountings
Double wishbone suspension assemblies
In skateboards, bushes limit the motion of the trucks.
In fastening, bushes are also used to transfer loads from a fastening to a much larger area in the underlying structure, the object being to reduce the strain on individual fibers within the underlying structure.

Who are some of the manufacturers of Polyurethane Suspension Bushes?
There are many companies which manufacture suspension bushes using polyurethane including Polybush, SuperFlex, SuperPro & Powerflex.


An extract from Polybush's website gives more information about the company and the advantages of using their products.
"Polybush are the world leaders in Polyurethane Suspension Bushes and Components.


Why Fit Polybush?
Impressive and Confident Ride
Excellent Noise Damping
Sharper Turn in - Predictable
Controlled Suspension Movement
Reduced Body Roll
Designed & Engineered to Exact Specifications
Pure Materials, Immense Flexibility & Resilience
Fit & Forget - Excellent Longevity"

Polybush offers Suspension Bushes, Anti Roll Bar Mounting Bushes for 4x4's including Land Rover, Mitsubishi, Nissan, Suziki & Toyota. Moreover, Polybush manufactures bushes for Alexander Dennis, Mercedes, Leyland, Volvo, Scania, DAF, Optare, Bedford, AEC, IVECO, LDB, DAF 45, Ford, Dennis Eagle Man, Fiat & ERF.
Additionally, Polybush caters for a full range of classic cars such as Aston Martin, Austin Healey, Ford, Jaguar, Lotus, Mazda, Morris, MG, Triumph & Mini 1959-2001.
Likewise, Polybush has a complete range of bushes to suit all modern cars including Alfa Romeo, Aston Martin, Audi, Citroen, Ford, Honda, Jaguar, Mazda, MG, Mitsubishi, Peugeot, Porsche, Rover, Seat, Skoda, Subaru, Toyota, TVR & Volkswagen.

Polybush further offers specialised Bushwakas for Landrover Leaf Sprung, Landrover Coil Sprung, Landrover Steering Drop Arm Puller, Landrover Crankshaft Pulley Remover, Landrover Steering Wheel Puller, Landrover Drop Arm Ball Joint, Uper Seating Extractor.
Source: http://www.polybush.co.uk/ as of May 2011.

SuperFlex (3 year road warranty)
The following text taken from Superflex's website describes their products in more detail>

"Instigators in Europe of the development and sales of a wide range of Top Quality Polyurethane Suspension Bushes - Primarily for the upgrade of performance and classic cars.


- Since 1993.
SuperFlex polyurethane suspension bushes are not mere copies of the original rubber bushes. They are individually designed to take full advantage of the special characteristics of polyurethane - its durability, and exceptional friction-absorbing capability not hitherto attainable with rubber. Critical crush, pre-load, and location factors are calculated to achieve positive, responsive driver feedback, which complements a vehicle's roadholding capability - coupled with ride refinement. The four manufactured formulations of firmness (70, 80, 90, & 95 Shore-A) enable us to match the needs of each individual application. The superior finish of SuperFlex polyurethane bushes - machine-finished where appropriate - is not purely cosmetic either. It ensures a precise fit – an important part of the optimum crush, pre-load, and location equation. Sophisticated casting techniques maintain the consistency and accuracy that put SuperFlex polyurethane suspension bushes - and the resultant quality of handling that you will experience - in a class of their own. The SuperFlex experience comes only when you fit genuine SuperFlex polyurethane bushes. So be certain that is exactly what you get"


SuperFlex produces a wide range of polyurethane suspension bushes for many vehicles including Alfa Romeo, Amphicar, Armstrong Siddeley, Audi, BMC, BMW, Chrysler, Daihatsu, Daimler, DeLorean, Fairway, Ferrari, Fiat, Ford, Ginetta, GM/Vauxhall/Opel, Honda, Hyndai, ISO, Jaguar, Jensen, Lancia, Lexus, Lotus, Marcos, Mazda, Mercedes, Mitsubishi, Nissan, Panther, Peugeot, Pontiac, Porsche, Porton, Reliant, Renault, Rolls Royce, Rootes Group, Rover & MG Rover, Saab, Seat, Skoda, Subaru, Suzuki, Toyota, Triumph, TVR, SuperFlex Universal, Volkswagen & Volvo.
Source: http://www.superflex.co.uk/ as of May 2011.

SuperPro (3 Year / 36,000-Mile Guarantee)
SuperPro carries the slogan, "DEVELOPED FOR THE ROAD...PROVEN ON THE TRACK" by delivering a host of innovative bushes.
According to their corporate website, "SuperPro bushes are tried, tested and proven in motorsport, which means they deliver outstanding performance. Their innovative design and superior materials offer dramatic improvements in handling and give a more precise feel through the corners. Unlike some polyurethane bushes, with SuperPro products there is no increase in vibration or ride harshness, an attribute that makes them an ideal choice for cars that are used for both normal road driving and track days."


Improved handling and stability
Long life, low maintenance
Precision engineered for an exact fit
Increased tyre and suspension life
No increase in vibration and road noise
3 Year / 30,000-Mile Guarantee"

Source: http://www.superpro.eu.com/ as of May 2011

SuperPro manufactures polyurethane suspension bushes for AC, Acura, Alfa Romeo, Asia, Audi, Austin, BMW, Chevrolet, Chrysler, Commer, Daewoo, Daihatsu, Daimler, Datsun, Delorean, Dodge, Eunos, Ferrari, Fiat, Ford, GMC, Hillman, Hino, Holden (GMH Australia) Honda, Humber, Hyundai, Infiniti, International, Isuzu, Jaguar, Jeep, Jensen, Kia, Lancia, Land Rover, Lexus, Leyland, London CAB, Lotus, Mahindra, Marcos, Maserati, Mazda, Mercedes, Mercury, MG, Mini, Mitsubishi, Morris, Nissan, Opel, Perodua, Peugeot, Plymouth, Pontiac, Porsche, Proton, Reliant, Renault, Rover, Saab, Scion, Seat, Singer, Ssangyong, Subaru, Sunbeam, Suzuki, TATA, Toyota, Triumph, TVR, Universal Parts, Vauxhall, Volkswagen, Volvo, Westfield & Wolseley.


Powerflex (Lifetime Warranty)
The UK based company with a global presence boasts to be producers of the "No.1 Suspension Bushes in Europe" and perhaps with good reason too.

A few paragraphs from their company website give an insight in to Powerflex and their products.
"EPTG Ltd (European Polyurethane Technologies Group) was formed in the UK in 1996 to take advantage of the significant advances made in the development of polyurethane in recent years.

The company has wide experience of automotive suspension and chassis system and combining these design skills with advanced polyurethane manufacturing techniques led to the development of the wide range of high performance automotive polyurethane components now known the world over by the product name POWERFLEX.


Special Manufacturing
The special type of polyurethane Powerflex use is an advanced material which has unique properties. Powerflex products have the ability to offer high performance without vibration or noise but with exceptionally long life.


In addition to Powerflex "standard" range of bushes, which Powerflex publish, Powerflex also manufacture many special components for original equipment car companies and also industrial applications.


Because of Powerflex manufacturing facility and wide experience with suspension components Powerflex can design and manufacture very quickly bushes and other parts, specially for you.


Powerflex manufacture special parts for a number of non automotive industries. These include marine parts for corrosion protection, shock absorber mounting bushes, sound absorbing mounting pads, train door mechanisms, rollers, mounting blocks etc.


The materials Powerflex use can be modified to offer different properties. Hardness levels offered can be in the range Shore A 35 to 95. Powerflex can manufacture in any colour. Powerflex can even arrange to package products using your packaging and designs.
These are the common problems associated with soft, ageing, or failing rubber compound suspension bushes. POWERFLEX products offer the cure.
Prolonged tyre life
Improved performance
Increase safety
Greater cost-effectiveness"


Source: http://www.powerflex.co.uk as of May 2011.