Originally Posted by ccrcraceway

I too have looked for the answer to what is the difference between btw 2d and 3d clutch . and not finding the answer to the question i went on doing my own tests to figure out the difference . so my answer is based on physic and some of it based on experience .

physic's say the less the moving part the better and strong the system is.

3d clutch has 3 weight hence when they push outward to engage the clutch its not necessary that all the weight have the same amount of G force working on them so there is a bit of lack in consistence in engagement hence a bit more slippage . i believe the 3d clutch runs a bit more hotter than the 2d .causing more stress on the bearing and all the internals . The 3d fly wheel material wore out easily.

2d clutch has 2 weight which are opposite to one another and so evenly push out under load . and hence has more consistence in engagement. the fly wheel is coated so the inside doesnt wear like the 3d clutch hence again a better smoother throw . 2d clutch was devolved for the new age high revin engines to provide a smoother feel and convert more rev's to forward motion .
now this what i have learned and btw these two system 2d is my choice.


now the Grey shoe is made of softer material causing a bit more slippage then the red shoe , clutch system normally gets a bit hotter compared to red shoe . grey shoe good in low traction small tracks . they have a softer engagement .
red shoe made of a harder material which provides strong engagement with less slip, which reduces heat to provide consistent performance from start to finish. they are good on big track (like moorebank )

so this is based on my experience and it could be totally opposite to what the book's say.
cheers
Alex Siddique