PRI 2006 - StreetFire.net does a technical intervi

Has anyone used a Carbotic or Kevlar single disk 8.5" to 9.5" clutch plate?

I nearly ordered a Ceramic plate tonight. Then I found some info on some more gentle engagement clutch materials that have similar power handling and also lower wear on pressure plates and flywheels.

From what I understand ceramic is going to eat the pressure plate and flywheel friction surfaces, chatter and have brutal engagement. It does not derate as it gets overheated.

Kevlar and carbotic clutches should be much more gentle according to this information.

I would really like to keep this my daily driver. Twin plate is not inside my budget and I am completely disinterested in buying a clutch that might rattle or chatter unless 100% necessary.

 

1680
IronMan Six Puck Sprung 1680 Series Disc
If you want the best the industry has to offer - Ask for IronMan. The CCI IronMan strip disc also uses our high torque internal assembly, but goes one step further in terms of friction. This disc uses an advanced hybrid iron and carbon combination delivering aggressive bite and increased thermal capacity. Uncharacteristic of the typical aggressive racing disc, the IronMan disc provides outstanding stability, smooth engagement, and less wear on opposing plates.

 

http://www.youtube.com/watch?v=y_ImDsveHpE

Ok I have decided upon a material.

 

because the rotary is so compact we are handicapped w a small flywheel and therefore small frictional area on the flywheel.

there is no free lunch.

clutch evaluation is all about area and coefficient of friction.

when you are above 475 or so you need at least 2600 pounds of spring pressure w a single disc.

since a double disc doubles frictional area spring pressure can work at 2000.

makes it easier on the clutch actuating arm and your leg.

i ran an Exedy Hyper Single (2640) cerametallic until it slipped around 465 rw and switched to an Exedy twin cerametallic (2200) which worked great at over 500.

when i switched to a Tremec T56 6 speed i worked w Quartermaster which offers a slightly larger (+18%) frictional area 8.5 inch clutch and was able to reduce the pressure to 2000.

anyway, once all the descriptive stuff (see above) is finished the real meat and potatoes is...

coefficient of friction (hot and cold)

all cerametallics, for example, are not the same but close/

Exedy is .48 hot or cold for their (patented) cerametallic

Exedy carbon/steel varies between .24 and .48 depending on temperature

of course carbon/carbon does not have the hot/cold variance (Tilton for instance) but is $$$.

any data on any clutches would be interesting.

howard

 

http://www.youtube.com/watch?v=mfyPZ9f1h3w

I just wanna make sure I'm headed in the right direction. A 215mm 4 puck unsprung ceramic is proven to hold 500+rwhp and last a couple of years of abuse.

I just want to see if I can get the power handling with a nicer engagement without shelling out for a rattly twin plate.

 

You make it sound like twin plates are not streetable (rattly) and not worth the money. Completely wrong on both counts. My Exedy cera-metallic twin disc was one of the best mods I've installed on my FD, and that's saying something

 

Exactly! The parts will cost 50% more and I will need to find an outlet that prides themselves in knowing what the 'state of the art' for single plate street drive able clutches is.


I've found a local shop who can manufacture exactly what I want. He can do the whole shebang.

Carbotic Plate
Custom Clamp Pressure
2 options of puck count (4 or 6)
Option for sprung or un-sprung hub.
Dowel pressure plate to flywheel and surface both faces.