30
Dec
07

EVR Slipper Clutch

img_0043.jpgnuovogruppofrizione.jpgEVR Slipper Clutch – MUST SEE!!!!!!!!!!!!


I went to EICMA with a goal of finding the best slipper clutch for my 1098 and to see the new 848 and 1098R. Some of you may have seen my thread asking about slippers already.Within the first hour I saw a slipper clutch that blew me away, and looked different than the others I had seen, and this is when I met Edo Vigna, who is the inventor of the slipper clutch! Like an idiot I had no idea who he was, but proceeded to ask him 100 questions and he was nice enough to show me the STM/Bucci designs he invented and compared them to his EVR slipper. I was blown away and this is what I found out:Who is Edo?:

Edo Vigna was Ducati engineer for their SBK race team about 15 years ago and is the inventor of the slipper clutch! He also developed the clutch for STM and Ducati’s Bucci. He also has a superstock team in Italy.

The EVR Slipper Clutch (I hope I explain this correctly, if you see something questionable please let me know):

According to Edo his new patented slipper is the next evolution of the slipper clutch. The old style slipper clutches (STM, Bucci, etc.), have a moving central hub that puts pressure on the ramps at different angles and cause friction between the clutch plates and the clutch drum causing excess friction and wear on the discs. The other issue he explained is that the bearings of the old style are made from steel and aluminum, which creates a mismatch in metals both from a fatigue standpoint and the simple fact that the two metals don’t work well together. (old clutch in pics)

This problem doesn’t happen with EVR slipper clutch because the clutch drum doesn’t move up and down, but is fixed. Only the cover of the hub moves. Also, there are no ball bearings or different metals coming into contact with each other.

Rather than relying on ramp angles, the control of the torque/slippage system can be adjusted by replacing the spring weights and/or adding and subtracting springs.

The CTS model for Ducati’s with a dry clutch includes all parts and mounting hardware for the slipper clutch system including the 1) inner clutch and steel sintered clutch plates (most kits force you to buy new plates!!), 2) the housing clutch with 48 hemispherical grooves, and 3) ventilated pressure plates (multiple colors), which also lower the function temperature by about 10%. I believe the only piece not provided is the larger diameter washer required for the 1098, but this is included for all other Ducati’s.Anyone have any experience with these? I spoke with a local mechanic with experience racing and he said they work great on the track, however the first versions were difficult when launching at the start. From what I understand this has been addressed by EVR with their new version.

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