,
 |
| RPS carbon twin disc clutch |
If you have a very powerful street car or are into drag racing where a gradual engagement is desired there are multi disc clutches that will work for these situations. Companies like ACT, Cusco, Exedy and OS Giken make multi disc clutches with concessions to streetabablity. All three make larger diameter discs with choices of less aggressive friction materials. All three have the option of sprung hubs. The only disadvantages that these clutches may have over the true racing multi disc are due to the features that help make them streetable. These are slower shifting due to the greater inertia of the heavier sprung hub discs and more gradual engagement ratios of the diaphragm springs.
 |
| This Cusco twin disc features pull type disengagement and a billet pressure plate. |
ACT, OS Giken, Exedy and Cusco have many interesting and innovative design features to make their clutches smoother and quieter. These clutches have features like a moveable fulcrum for the diaphragm spring to spread out the engagement travel. Some models have drive straps like a single disc clutch to prevent the pressure ring from rattling against the pressure plates drive lugs. The floater plate also has separator leaf springs to keep the floater plate from rattling as well. These features make these clutches quite good for street use, road racing and drag racing. They also have off the shelf applications for most popular import performance cars. If you have a 600 or greater hp street driven Supra, DSM, Z, EVO or WRX these might be your only practical and most streetable clutches that can hold your power without resorting to carbon friction material.
 |
| The floater plate on Cusco and Exedy Clutches use these separator leaf springs to keep the floater plate from banging around and making noise. The floater plate is also vented to help cool the clutch. Here the leaf spring is shown in place. As you can see the leaf spring keeps the floater plate loaded so that it can’t chatter around and make the typical multi disc chinging noise. |
