Mantic Clutch Information

Mantic Clutches

We are proud to welcome Mantic Clutches to our growing list of premium LSX parts suppliers.  Some people may have never heard of Mantic or their amazingly high quality clutches – so here is a little about them and their products.

You can shop the full line of Mantic products by clicking here.

Who Is Mantic?

Mantic performance clutches are fully engineered and manufactured in Australia by engineers with full research and test facilities at their disposal.

Mantic performance clutches feature truly unique design and engineering innovations that set them apart from any other performance clutch manufacturer.

Mantic Clutch Features:

    • Patented Pressure Plate ER² design
    • Increased clutch disc Mean Effective Radius
    • High torque capacity with light pedal effort
    • Cerametallic/Organic dual material clutch disc
    • Lower MOI (Moment of Inertia)
    • Single and Twin Disc modular configurations

Twin Disc vs. Single Disc Clutches

Mantic manufactures Twin Disc and Single Disc clutches for GM LSx powered vehicles.
Twin Disc: Mantic 9000 Series, 1,010 ft-lb Torque Rating (at the wheels)
Single Disc: Mantic Street with ER², 550 ft-lb Torque Rating (at the wheels)

Mantic 9000 Series (Twin Disc)

Mantic TwinMantic 9000 Series clutches are twin disc, 9” (225mm) diameter modular clutches that are designed for high performance cars or track use.  Mantic 9000 series are low MOI (Moment of Inertia) twin disc clutches that offer a level of performance not only superior to a single disc unit, but also allow you to select options that best suit you.

The key to the 9000 Series is the street drivability of the Sprung Street Cerametallic discs.  These suit high performance engines and enthusiastic driving styles, while allowing excellent drivability when needed. Light pedal effort is another bonus from the 9000 Series.


    • High torque capacity
      • The 9000 Series offer up to 1,010 ft-lb of torque drive capability (at the wheels)
    • Light pedal effort
      • Smaller diaphragms used in multi disc clutches require less pedal effort
      • OEM pedal effort is 10 lbs, the Mantic 9000 Series w/ Standard Pressure Plate is 11lbs, HD Pressure Plate is 14lbs.
      • Drives almost like stock
    • Decreased Weight
      • The complete 9000 Series kit weighs only 33.8lbs.
    • Decreased M.O.I (Moment of Inertia)
      • Lower weight means less inertia has to be overcome to spin the clutch. This means less engine power is needed to turn the clutch. The net effect is the vehicle is able to accelerate faster. Reducing the Moment of Inertia of the Clutch Kit has the same effect as adding power to the engine, enabling it to accelerate more quickly.
    • Quiet Operation
      • Noise is a common problem on twin disc clutches when used in street applications. The Mantic 9000 Series feature a unique spring clip system on the intermediate plate to remove noise from the clutch.

Mantic Street with ER² (Single Disc)

Mantic SingleThe Mantic Street with ER² is a Clutch Kit specifically designed for the LSx Performance Market.

The Mantic Street Single is capable of transmitting greater than 60% more torque than a standard Clutch Kit making it suitable for high performance LSx powered vehicles.  The overall torque capacity increase has been achieved by higher clamp loads, increased Mean Effective Radius of the friction area, better cooling of the pressure plate and higher coefficient of friction materials on the clutch disc.  These design innovations directly equate to higher torque capacity.


    • High Torque Capacity with light pedal effort
      • The Mantic Street Single offers up to 550 ft-lb of torque drive capability (at the wheels)
      • OEM pedal effort is 10 lbs, the Mantic Street Single pedal effort is 15 lbs.
      • Drives almost like stock
    • Patented Pressure Plate ER² design
      • Increases the Torque Capacity of the Cover Assembly by up to 8%
      • Assists with cooling, which in-turn enables the friction material to operate at lower temperatures and therefore at a higher coefficient of friction, enhancing the torque capacity of the clutch.
    • Increased clamp load
      • By altering the pivot point of the pressure plate, higher clamp loads have been achieved. This directly equates to higher torque capacity.
    • Dual material Clutch disc
      • The Clutch disc has a standard organic facing ring in contact with the ER2 Pressure Plate and a segmented cerametallic facing on the Flywheel side. The Cerametallic material has a higher coefficient of friction. This increases the Torque capacity of the clutch.
    • Increased Clutch disc Torque Capacity
      • The Clutch disc has been “Up Sprung” to increase its Torque Capacity. Heavier duty Damper springs have replaced the standard springs so that the increased Torque Capacity of the Cover Assembly can be transmitted through the Clutch disc without the springs bottoming out.
    • Clutch Disc and Pressure Plate designed as a matched pair
      • Mantic Clutch discs and Pressure Plates are designed and manufactured to the optimum set up position to obtain the highest clamp load through the life of the clutch.

ER2 Design Concept Explained

er2picCover Assemblies with the ER2 Groove Design feature have a unique groove pattern CNC machined on the friction face of the Pressure Plate.  The groove has been specifically designed to increase the Mean Effective Radius of the pressure plate and assist in heat removal.  The increase in the Mean Effective Radius of the Cover Assembly gives an increase in Torque Capacity by up to 8%.  Mean Effective Radius is directly proportional to Torque capacity.

By adding the groove to the Pressure Plate, the inside radius of the friction face has effectively been increased.  The first 5/16 inches of the pressure plate has all but been removed and added to this, there is progressively less material removed as the radius increases.  The net effect of this is to move the effective inside radius further out.  When comparing the Mean Effective Radius (RM) of the ER2 version to the non ER2 version you can see the ER2 version is further out.  This increases the Torque Capacity of the clutch.  Torque Capacity is directly related to Rm.

Advantages of Low “M.O.I” Explained

The advantage of decreased weight is that you will achieve an incremental improvement in your vehicles power to weight ratio.  The smaller diameter clutch is lighter even though an intermediate plate and extra clutch disc is added. This is because the effect of the weight decreases dramatically as the diameter gets smaller. i.e. the weight is proportional to the radius squared. If the radius is halved the weight is decreased 4 times.

The advantages of lowering the Moment of Inertia of a clutch assembly is two fold. Firstly there is less inertia required to spin the clutch assembly therefore requiring less of the engine power to spin up to speed. The net effect is the vehicle is able to accelerate faster. The second is that the clutch discs will not continue to spin on for as long and therefore enable gear changes to happen quicker. The net result again is faster acceleration and less time when there is no power being transmitted to the wheels.

The Moment of Inertia is a measure of an object’s resistance to changes in its rotation rate. The symbol ‘I’ is used to refer to the Moment of Inertia.

The Moment of Inertia is of particular interest with clutches and Flywheels because to accelerate a vehicle we need to overcome the vehicles resistance to acceleration or its Moment of Inertia. Reducing the Moment of Inertia of the Clutch Kit has the same effect as adding power to the engine, enabling it to accelerate more quickly.  It is important to note that the Moment of Inertia is proportional to the Radius squared.  So a small change in the Radius or Diameter of a clutch has a dramatic effect on the Moment of Inertia.  For example an increase in Diameter of 40% i.e. from 200mm to 280mm approximately equates to a doubling of in the Moment of Inertia or a doubling of the resistance to changing the rotation rate or a doubling of the power required to accelerate this clutch.

All Mantic products ship FREE with coupon code: Mantic

Corvette applications:

Camaro applications:

Pontiac GTO applications:

Pontiac G8 GXP applications: