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914World.com _ 914World Garage _ Clutch Surface Question

Posted by: Mblizzard Jan 24 2014, 07:47 PM

Ok I have been looking at clutches to install after I complete the Dr. Evil tranny rebuild. Won't bore you with the part numbers but in the 6 spring configuration I have noticed two different types of surfaces on the clutches. One completely smooth and a light cold

Attached Image

And another much darker with groves

Anyone have any ideas about what the differences are between the two? One better than the other?

Posted by: McMark Jan 24 2014, 08:48 PM

The lower one is typical Sachs OE clutch. I've never seen or used the top one.

Posted by: tomeric914 Jan 24 2014, 08:58 PM

The top is more like the VW/Porsche clutch discs from the 60's and 70's. I had a NOS one somewhere.

The bottom one is a "modern day" clutch disc.

Posted by: Mblizzard Jan 25 2014, 09:10 PM

Ok I think I have this figured out. The first clutch is referred to as an "organic" material. And the second more modern version is a ceramic mix material.

Supposedly the organic material is better for standard driving and the others are a little more performances oriented.