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Clutch disc information

 

We will very easily go through some types of clutch discs that are available on the market. This is to be able to decide afterwards which one is suitable for a specific area of use.

Adressed subjects

- Number of disks
- Diameter
- Material
With the help of these three choices, you can configure a clutch disc that suits you needs.

 

Number of clutch discs

A clutch disc can be offered in options from 1-4 discs. Standard car clutches usually use a one disc clutch. On motorsport applications, you often see 1-3 disc clutches, these are also called multi disc clutch.

More clutch discs can handle more friction and thus more transferable torque. With more numbers of discs, even more heat can be stored.

A two disc clutch can theoretically handle twice the torque compared to a single disc clutch.

Diameter

There are many different diameters of discs, but you can generally divide them into two groups.

-Original and Motorsport

Original is usually 215mm or more. Examples of sizes are 215mm, 228mm, 240mm and 250mm.

Motorsport is usually up to 200mm. Examples of sizes are 115mm, 140mm, 184mm and 200mm.

A larger diameter means more friction and thus can handle more transferable torque. a smaller diameter means less moments of inertia as the mass is moved towards the center. This means less mass that must be accelerated and thus a faster engine.

A larger clutch can absorb more heat before it risks overheating. A smaller clutch can not absorb as much heat and that is one of the reasons why you use several discs instead.

Clutch disc material

3 different types of clutch discs

Although the diameter and number of discs largely determine the properties of the clutch, the material in the clutch discs is a third factor that is of great importance for how the clutch behaves and what it is used for.

In addition to Organic, Sinter and Sinter coatings, Carbon is available as clutch disc material. Carbon is the most temperature resistant, lightest and also the most expensive of the various alternatives.

 

1. Organic clutch disc

 

Organic clutch disc are used in OEM and aftermarket. It is the softest and most gentle material for the gearbox. This material is well suited for street driving because of the soft engagement where you are allowed to slip on the clutch.

However, this material is not very temperature resistant and is not used in competition contexts or if many quick starts are to be made where higher temperature is generated.

This clutch disc behaves like an original clutch and is the easiest to drive if you do not need temperature resistance like a sinter.

 

2. Sinter pad clutch disc

Sinter pad clutc disc have sintered pads riveted to a plate. These can withstand significantly higher temperatures than organic clutch discs. -Many times twice as high temp!

Since there is a sinter pad riveted on each side of the disc, a certain amount of wear is allowed before you need to change the disc. This property makes the disc well suited where you have to slip on the clutch and much wear occur.

When a disc with sinter pads begins to wear out, you can only replace it and keep the other clutch wear surfaces if they have not been damaged.

This type of clutch disc is very flexible due to its temperature resistance together with acceptable service needs and operating costs.

 

3. Sinter clutch disc

Sinter clutch disc is a very light construction that can withstand high temperatures and is used in track racing and in formula vehicles. A sinter has very little room for wear. When a sinter is worn, both the disc and the friction surfaces around it are replaced.

This type of clutch disc is light and compact but also a little more extreme due to its higher need for service.