Ducati Monster Forum

I keep hearing the word "slipper clutch"...

Just wondering how many people are aware that the Ducatis they are referring to that have "slipper clutches" do not in fact have true slipper clutches.

A true slipper clutch works from much differently than the simple wet clutches that in fact Ducati uses in it's newer models. Motocross guys use a true mechanical slipper clutch to lessen 4 stroke torque hits and prevent wheel lockup on decleration....much, much different design than a simple wet clutch.



I guess since I'm talking clutches... Is anyone aware of an autoclutch available for the 696? I currently have a Rekluse pro autoclutch in my KTM dirtbike and love it. I don't see anything similar listed on their website.

most people know that.

thats why most call it a "slipper" clutch and not a slipper clutch.

its actually name is APTC Clutch. I remember reading that the clutch was designed to reduce effort at the lever to increase clutch life and had the added effect as being a "slipper" too.

Most people realize they don't have a real slipper clutch the first time they get the back wheel hop.

 [laugh]

OK... Just kept seeing it posted and when I was looking at buying my 696 I had a hell of a time convincing the the salesman that it wasn't a true slipper clutch.



Still would love to find an autoclutch for this bike... wonder if anyone is working on making one?

tell him ur going to drop 3 gears at 141mph and if the rearwheel hops u want a full refund for the pants your about to shit into.

 [thumbsup]

 [laugh] [laugh] [laugh]

The (wet) APTC clutches reduce the clamping force on the plates when the rear wheel is trying to turn the engine.

The dry slipper clutches do the same thing, but with a different mechanism.

How do you define a "true slipper clutch"?

I think the term slipper clutch relates to any clutch which allows the torque or engine braking to be reduced by allowing the clutch to "Slip" thus controlling rear wheel under heavy braking or sudden torque.

Yes, that is a true slipper clutch. They really perform well when braking in bad braking bumps.

Here is an example of one that fits by KTM...

http://www.ktm-parts.com/152-2105.html (http://www.ktm-parts.com/152-2105.html)




 [laugh] at He-mans suggestion...

the monster would have to be able to do 141mph first  [laugh]

No problem for the Capirex  ;)

Waddya mean?

 Mine will do 141mph.... all on a proper race track of course ;)

Well.... Actually a touch under 140mph (225kph) and then I ran out of road.... errr... umm... track ;)

have your bike modified by Dr Emmett Brown as he knows how to circumvent the need for roads! ;)

did you correct for the 8% speedo reading?

The Adler Power Torque Plate (APTC) is a type of slipper, but it also provides an easier clutch pull.

And yes, DP does offer a dry APTC.

http://www.store.commoto.com/ducatistorehypermotardclutchslipperclutches-adleraptcslipperclutchforducatidryclutch-p-29615.html (http://www.store.commoto.com/ducatistorehypermotardclutchslipperclutches-adleraptcslipperclutchforducatidryclutch-p-29615.html)

It's not a traditional slipper (antihoppingkupplung) which is preferred for racing, it's sort of a street style which allows for easier shifting and more forgiving when hard shifting.

so you're saying a racing slipper will completely absorb a wheel hop?

hell no, not all of them.

put enough torque into any slipper clutch at the wrong moment or when you're braking and that wheel can go up like a mule.

so technically they all are slipper just varying degrees of slippage.

i'd go with that.  the APTC type can handle less torque than the traditional slip type but they all function similarly. 

some people don't like how the APTC changes clutch lever feel.  the traditional antislip doesn't change it much

I swapped the APTC for a "regular" clutch and am much happier. 

i wonder how you'd like a traditional slipper..

I wouldn't mind trying it.  The thing that I disliked the most about the APTC (and didn't realize till I switched) was the less than positive location of the friction point.  I had the opportunity to ride the "regular" clutch and immediately jump on an APTC bike, and the difference in feel is significant.

I didn't find the touted slipper action of the APTC particularly effective at stopping tail wag (chirping the rear tire) on downshifts under hard braking.  I assume some of that is riding style and bad habits/lack of skill, but still.

if you're hard braking, i'd assume to be grabbing some clutch too.

the "less than positive" feel is exactly what the slipper does -- it lets the clutch slip a bit if the amount of torque increase exceeds the slipper's function (i.e. ball angle or spring pressure).  it basically is pushing back on your lever, if you will.

it does require soem getting used to.  when i ride my SS i have to give myself a few minutes to feel the clutch again.  my s2r's clutch has become sort of my standard now.

I did mention riding style... I use a lot of engine braking.  On my way home the speed limit drops from 65 to 55 maybe 200ft from my downhill, linked right hand turns (essentially one turn, although technically 2 with a 50-100 ft. straight in between) onto a privately maintained frontage road with no houses and another left turn about 1/4 mile away.  No houses for approximately a mile, straight line, excellent visibility through all corners.  And that's all I'll say about that.

More specifically, I didn't like the uncertainty when leaving from a stop or when attempting to do low speed parking lot stuff.  It is really difficult for me to feather the APTC at just the right point so I can feel comfortable making tight turns a la MSF stuff. 

For city driving the APTC is fine. Its keeps lever pressure down which in turn means less hand strain. I like it and ridden bike with and without slippers.