Frequently Asked Questions:

General Questions:

Can I buy direct from Helix Autosport?

Helix Autosport uses a select network of distributors to sell our products within the EU, we do not have the resources to send individual items.
The teams in this distributor network order in bulk, making it very likely that they keep your parts in stock, meaning customers get their parts faster.

Find your local distributor on our Distributor’s page.

Do you Sell complete Clutch kits?

Helix Autosport manfacture 2 types of kit:

Uprated road car clutch kits 
Multi-plate racing clutch kits

Do you also supply individual Parts?

Yes, if it has a part number it can be ordered, this includes:

  • Flywheels
  • Drive plates, Cover Assembly’s, Release Bearings
  • Compelete clutch kits
  • Racing multi-plate parts

How do I know I am ordering the correct parts:

There is some basic information about the clutch next to the part numbers.
These are there to ensure that these are the correct parts for the vehicle.
Details include:

  • Clutch diameter
  • Spline size 
  • Year of manufacture

Also listed will be some details as to the exact model, these may include:

  • Engine code
  • Engine size
  • Specifications of model

Please check all of this information very carefully before continuing.

Can I please see some photographs of your clutch components?

We have uploaded pictures of the majority of our racing products, along with a brief description of the parts and a part number prefix, on our Racing Clutch page and you can click on any of the 3 different diameters available. We do not currently keep photographs of our Performance Road clutches, this is because we manufacture thousands of parts. However if you need a picture, please email us and we will try to help.

How much Horsepower can my clutch cope with?

BHP is not very relevant for transmission components, it is the torque output of the engine that is important.

In the back of our ‘Performance Road Clutch catalogue’ a torque capacity of the clutch, with either an organic drive plate or a paddle drive plate, is given against each part number.

 

Clutch Specific Questions:

What type of driven plate do I need?

Please look at the different types of plate which we sell and pick the one for the application which suits you.

Organic Drive Plate:

  • Best suited to road applications
  • Can be used for light competition / low torque engines
  • More comfort in engagement & better feel
  • Least prone to judder
  • Low inertia (Lightweight)
  • Available with rigid hub for aggressive driving
  • Available with sprung hub for progressive feel

Cerametallic Paddle Plate:

  • Available in both rigid and sprung centre formats
  • Primarily used for rally and track applications
  • These can be used for race applications
  • If a sprung centre is used, this plate can be driven on the road.
  • More resistance to high energy input
  • More prone to judder than Organic Plates
  • Less prone to judder than sintered material plates
  • Smoother engagement than sintered material plates
  • 4 Wheel Drive systems can have high wear rate on road
  • Option of 4 paddle plate (low inertia) or 6 paddle plate (increased wear resisitance)

Sintered ridged plate:

  • Used primarily in race applications
  • Compact dimensions
  • Very  low centre of inertia
  • Very light weight
  • Common used in multi-plate kits
  • Good thermal properties
  • Ideal for very high torque figures
  • Will withstand aggressive driving styles

What do the little springs in the drive plate do?

  • They create a small amount of rotational movement
  • As rotational movement increases so does its resistance.
  • This acts like a cushion within the transmission
  • Increases the feel of the clutch
  • Allowing the clutch to be driven in traffic

Disadvantages of the springs:

  • Increases the overall size and reciprocating mass of the plate
  • Cannot be used in a multi-plate race kit.
  • Springs weaken the structural integrity of the drive plate.
  • Should not be used in Rally / Autocross where the car can be airbourne.

What do the different part numbers mean?

Helix Autosport parts use a 6 digit number, the first 2 numbers are known as a 'prefix' and define the type of product:

Clutch Kit Part numbers:

  • 30-0000  = Organic clutch kit
  • 35-0000  = Organic clutch kit & flywheel
  • 90-0000  = Paddle clutch kit (sprung centre)
  • 91-0000  = Paddle clutch kit (rigid centre)
  • 95-0000  = Paddle clutch kit & flywheel

Drive plate Part Numbers:

O.E.M. Clutch sizes:

  • 70-0000 = Organic sprung centre
  • 71-0000 = Organic rigid centre
  • 76-0000 = 4 Paddle plate sprung centre
  • 77-0000 = 6 Paddle plate sprung centre
  • 78-0000 = Paddle rigid centre

Racing Clutch sizes:

  • 46-0000 = 215mm geared driven plates
  • 47-0000 = 200mm geared driven plates
  • 48-0000 = 184mm geared driven plates
  • 49-1000  = 184mm 6 paddle plates
  • 51-1000  = 184mm 3 paddle plates
  • 52-1000  = 184mm 4 paddle plates
  • 53-1000  = 184mm sintered discs
  • 54-1000  = 184mm sintered discs
  • 55-1000  = 184mm organic plates
  • 56-1000  = 184mm sprung paddle plates
  • 57-1000  = 184mm sprung organic plates
  • 58-1000  = 140mm sintered discs
  • 59-1000  = 140mm sintered discs
  • 70-1000 = 200mm organic drive plate
  • 70-2000 = 215mm organic drive plate
  • 71-1000 = 200mm organic drive plate
  • 71-2000 = 215mm organic drive plate
  • 77-1000 = 200mm paddle drive plate
  • 77-2000 = 215mm paddle drive plate
  • 78-1000 = 200mm paddle drive plate
  • 78-2000 = 215mm paddle drive plate

Flywheel Numbers:

  • RPF-0000 = Aluminium Alloy flywheel
  • HF- 9000 = light weight Steel flywheel.

Release Bearing Numbers:

  • 40-0000 = Mechanical Bearings
  • 41-0000 = Hydraulic Bearings.
  • 43-000 = Bepsoke Bearing conversion
  • 44-000 = Racing Bearing

Cover assembly:

  • 60-0000 = Uprated & strengthend cover assembly
  • 12-0000 = Stengthend road cover assembly. 
  • 63-000 = 184mm multi-plate race cover
  • 68-000 = 200mm multi-plate race cover
  • 69-000 = 215mm multi-plate race cover

An explanation of all our part number prefixes can be found in our 'Performance Road Clutch catalogue'.

Helix make push-type covers, but what about pull types?

Helix Autosport manufacture pull type clutches for road use and racing and these are very popular for:

  • Mitsubishi  Evos
  • Subaru Impreza
  • Porsche 911 / 962
  • Vauxhall Lotus Carlton

What are the advantages of a pull type clutch?

They have a very high torque capacity.

How often should the Release bearing get replaced?

Helix Autosport recommend that you replace the release bearing as a standard service item every time you replace the clutch. If you take the gearbox off to inspect the clutch, it is also worth inspecting the release bearing for any signs of wear or premature failure.

Does Helix Autosport sell hydraulic release bearings?

Yes, we do stock hydraulic release bearings and they are a very efficient, light weight and simple system, which can be a worthwhile conversion when installed correctly.

How long does a Helix Autosport Clutch last?

Life-span is influenced by many factors, including:

  • Driver style
  • Thermal input
  • Mass of the car
  • Torque of the engine
  • Car application

When is a driven plate behond repair?

The driven plate may need replacing if any of the following are applicable:

  • The plate is no longer flat.
  • The material has worn unevenly.
  • The splines a loose fit on the gearbox spline.
  • When you shake or tap it, it rattles.
  • There any cracks or scratches or significant marks on the plate.
  • The plate looks like it has ever been very hot (blue markings arcoss the majority of the plate.).
  • The plate is very old or a large number of miles.
  • It has been used in a very ‘enthusiastic’ driving style.
  • The friction material has been contaminated with oil.

What about thermal performance?

When the pedal engages and disengages the clutch there will be friction created whilst the two surfaces slip, this friction wears the clutch out, and a by-product of this wear is heat.

Heat is detrimental to the performance of the clutch, it can cause:

  • Damage to the friction material
  • Warping of the drive plate within the clutch.

Reducing slip on the clutch increases the life of the clutch and lowers the chance of damage. 

 

Racing Multi-plate clutch Questions:

An up-rated standard clutch instead of a purpose made multi-plate racing clutch?

Helix Autosport recommends that a performance clutch is used for the following applications:

  • All road applications
  • Until the torque capacity of an uprated road clutch is exceeded.
  • If the driver has a very agressive driving style

A multi-plate racing clutch is the alternative, the benefits of a racing clutch are:

  • Less rotating inertia, due to being light weight.
  • Stronger design than road clutches.
  • Better able to tailor torque capacity to the engine specifications.

What performance advantage does having less rotating interia give?

Multi-plate clutches are intended for ONLY for Racing, subsequently they are optimised for compact dimensions with associated low reciprocating inertia, this is because the weight of the clutch is very small, promoting improved engine response.

What are the benefits of a racing clutch?

The clutch cover is a Billet Aluminium Alloy of the Lug Drive Design type which includes the following benefits:

  • Low moment of inertia
  • Good heat dissipation
  • Designed to allow dust to escape.

I understand the benefits of reducing the clutch size, however are there any disadvantages?

Small racing clutches will feel very different to standard road clutch, as they are far more aggressive, with a very ON/OFF feel, this is as a result of:

  • The cover having an increased Clamp Load, and the smaller diameter diaphragm spring.
  • The drive plate not using damping springs in the drive plate centres and the increased friction coefficient of the material.  Thermal capacity also reduces with smaller clutch kits, due to less heat sink.

Do you supply Carbon Racing clutches?

Helix Autosport does not currently offer Carbon-Carbon clutch kits.

For the vast majority of motorsport applications Sintered or Paddle clutches are adequate.

The advantage of is its higher operating temperatures and offers the ultimate weight/inertia reduction.

However they are very expensive and only used in a limited number of motorsport applications.

How do I install a Multi-plate race clutch?

A specific flywheel must be used and this will have the correct dimensions and bolt hole mounting pattern.

The correct clutch release bearing must be used against the face of the cover assembly.

What is the best Multi-plate race clutch for my car?

Take a look through our racing clutch kits on the website and you will find different options of single twin and triple plate type clutches.

These will list the type of drive plates which they can be used with, how much torque the clutch is rated to and what the total kit weighs.

What type of release bearing is required on a racing Multi-plate clutch?

Most multi-plate clutches have a flat spring, and therefore require a release bearing with a radius contact face to roll against the spring as the clutch is operated.

Which Clutch Sizes available:

However we are currently unable to offer 140mm racing covers and only able to offer sintered discs for 140mm clutches. 

Which Assemblies are available:

  • Single plate kits
  • Twin plate kits
  • Triple plate kits 

Triple plates are only available as 184mm sintered discs. 
 

Which racing drive plates are available:

  • Organic (sprung center or ridged)
  • Cerametallic Paddle (sprung center or ridged)
  • 140mm & 184mm ridged Sintered disc

 

Flywheel Questions:

Can I keep / remove my dual mass flywheel?

Helix Autosport understands that in the motorsport world  heavy and delicate dual mass flywheels are not always preferable, so we currently do a number of clutch kits with the option of removing the dual mass flywheel.

If you are in a road car and want to keep your dual mass flywheel, it is not advisable to modify twin mass or dual mass flywheels. If there is no other option, these should not be used above 8000 rpm

Is it true that some of the clutch & flywheel kits have non-interchangable parts?

Sadly so, this is because it is not possible to increase the torque capacity of the standard clutch, so we have had to design a complete new kit. Please read descriptons carefully when buying clutch kits to ensure a flywheel is or is not needed. 

How are your flywheels made?

Our flywheels are drawn using Solidworks CAD software, this allows for the design to be optimised quickly and with low development costs. It also allows the mass of the flywheel to be calculated before it is produced.

From these technical drawings a CNC programme is created and the billet is turned on the CNC lathe, then drilling and tapping of screw threads along with any other machining is completed. Dowels are then added and a ring gear can either be pressed on, or if an integral ring gear is required, we can have it's gear cut locally.

The flywheels are then dynamically balanced at the factory.

Can you lighten and balence my current flywheel?

Helix Autosport is also able to lighten and balance standard flywheels, to find out more about our capabilities with flywheels look at our 'Bespoke products' page.

Do you also sell light weight flywheels?

Yes – Helix Autosport offer a growing range of CNC machined light weight steel and aluminium flywheels for both uprated road clutches as well as multi-plate racing clutches.

It also supplies standard original flywheels, including dual mass flywheels.

Please see our 'Flywheel' page or Contact Us.

I wish to use my old OEM Cast Iron flywheel – Is that OK?

These clutches can be fitted to existing cast iron O.E. flywheels but these should not be used above 9000rpm.

 

Other Questions:

Still have an unanswered question?

Please use our 'Contact us' page, and one of the team will try and help you.