Ducati Sporting Club UK > Model Specific - Discussion, Technical Problems and Help > General Motorcycles only > A T Corse slipper clutch - anybody got one?

[marchesini]

http://cgi.ebay.co.uk/ATCORSE-SLIPPE...QQcmdZViewItem

Was looking for a slipper clutch on ebay and came across this guy. I have spoken to him and he says that these are exactly the same as the Ducati Performance items but without the branded pressure plate. The one shown for £350 notes is the ball and ramp type which is made more for the street and track (he tells me). He also sells another lighter type with springs only for pure race use but is more expensive at £550.

He seems to know what he's talking about and assures me that they are Italian (made in Bologna) with italian instructions (as opposed to the East European copies). So, is this really a bargain or more likely a case of 'you get what you pay for'.

BTW, this is purely for track use only. Thanks for any help.

Best regards

simon

[FiscusFish]

I've bought stuff from Andrea Talo (A T) before although not a slipper clutch. Deal went perfectly and he was a great help if that's of any use.

Darren

[doogalman]

Yep i have one. Works a treat. Arrived in good time wellpacked. Fitted myself . All fitted spot on. I use carbon faced alluminium plates in mine from Pro-twins. Complete slipper with plates set me back 460.
I'm happy.

[marchesini]

Originally posted by doogalman
Yep i have one. Works a treat. Arrived in good time wellpacked. Fitted myself . All fitted spot on. I use carbon faced alluminium plates in mine from Pro-twins. Complete slipper with plates set me back 460.
I'm happy.

Is this on the track or road? I have a Sigma version on my 996 which is pretty grouchy on the road - you have to gently pull away or it will stall. Other than that I have never had the back lock-up on me. I have heard some of the cheaper slipper clutches (east european copies) can still lock up on aggressive down changes. I've been told that this is exactly the same as the Ducati Performance item - which is the same as whose? Bucci, STM, Sigma? How can you tell the difference?

Do you need to buy new plates or can you reuse the existing ones? Or is this generally not a good idea.

Thanks for any help.

BR simon

[nelly]

A slipper shouldn't affect pulling away. Under normal circumstances it should behave as a standard clutch. It only works as a slipper when it's supposed to................. preventing the rear wheel locking up.
If you're suffering graunching or bad take up, then it's likely to be the plates. Either dusty, incorrect pack thickness or maybe the addition of a dished plate into the pack would help.

The point at which the slipper slips can be adjusted by varying the pack width. There's a very good article on sigmas site.
There are also two ramp angles which also come into play. 45 and 35 degrees. The 35 tend to be race only.
The other difference is the use of ball bearings or plain ramps. The higher quality slippers tend to use ball bearing ramps as these are smoother.

Although not as cheap as the AT product, there are a few summer specials in the offing from STM. Quality is second to none and there will be a 48T option. Mail me if they could be of interest

[marchesini]

Originally posted by nelly
A slipper shouldn't affect pulling away. Under normal circumstances it should behave as a standard clutch. It only works as a slipper when it's supposed to................. preventing the rear wheel locking up.

I know it shouldn't do (in theory) but it does and it is a bugger to pull away if you are not used to it. I know Sigma are well regarded around here but the only advice that I received when mentioning the difficulty in pulling away was to put the standard clutch back in. It was sold as a race item and as such isn't designed for traffic lights and town riding - this was with a completely new basket and plates (supplied by Sigma). I have got used to it but I have had comments from at least three people saying 'bloody hell, what is it with your clutch - I don't know how you ride it like that!" This is from three completely independent people (two of which are Ducati Specialists) but as I don't have the time to get involved with going back and forth trying to sort something I've got used to, I've just let the matter go.

Originally posted by nelly
Although not as cheap as the AT product, there are a few summer specials in the offing from STM. Quality is second to none and there will be a 48T option. Mail me if they could be of interest

I'll look into this but my thinking at present is to possibly take a chance on the AT clutch for the 996 street bike and put the Sigma slipper into the 748 track bike - that way, the stop/start issues won't be a problem as it behaves perfectly when on the move.

My confusion occurs when everyone says something different. Ball and ramps I understand work are accepted the norm but .... A T was telling me that there are new Ducati Race items that do away with the ball bearings and using springs only. Apparently, there have been instances of the ball bearings getting stuck slightly which is not considered to be 100% reliable. I thought that the cheaper versions used springs only but he was telling me that these are race items only and are the way the slipper clutches are going. Again, I'm only relaying what he told me so I may (through my limited technical knowledge) have not fully understood everything.

For the moment, the ball and ramps versions seem to be the most reliable. I have heard that the cheaper versions are the spring only versions and don't work reliably under agressive downchanges - the rear wheel can still lock up which defeats the object of the slipper. My thinking was that if the A T Corse version is a ball and ramp type, then it 'should' be a pretty painless buy.

Thanks for the advice

simon

[sparkin]

I have a DP(Bucci) in mine and it`s one of the best mods I`ve ever done

[doogalman]

Never had any problems with my AT clutch. A suggestion for you would be to E-mail some of the buyers of the feedback page.

But as i say , i've had no problems. I tend to very lightly grease the ramps whenever i strip it , which i do after any trackday or a large no of hard road miles.

Out of interest where in the country are you Marchesini???

[Edited on 26-8-2005 by doogalman]

[marchesini]

Originally posted by doogalman
Never had any problems with my AT clutch. A suggestion for you would be to E-mail some of the buyers of the feedback page.[Edited on 26-8-2005 by doogalman]

I may just do that.

Originally posted by doogalman
Out of interest where in the country are you Marchesini???

SE London / Kent. Barnehurst/Bexleyheath to be more precise. I know your neck of the woods, Redhill from a few years ago as I used to go to school there - The Alexandra and Albert School, Gatton Park. Don't know if it still exists though.

Simon