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Old 03-24-2008, 08:32 AM   #1
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Default FIORONI SLIDING CLUTCH PROBLEM

i have the "turbo twin" setup for my mbx5r. i am running a v-spec engine and i cannot get the flywheel to tighten up. it seems the nut will not tighten up all the way. i have tried different collets and still nothing. i have verified that what i ordered is "supposed" to fit the mugen. any ideas? is it that the v-spec is just different? i can put some washers between flywheel and nut but would that hurt anything?
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Old 03-24-2008, 10:48 AM   #2
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If i recall the nut goes on a certain way. Try it the other way first to see if it tightens. If it doesnt, it sounds like you are running out of threads so put a shim or 2 behind the collet then try it again. Hope this helps.
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Old 03-24-2008, 11:18 AM   #3
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tried that....what kind of shim do i use?
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Old 03-24-2008, 02:45 PM   #4
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I used a ofna shim behind the collet and another shim under the nut,I had the same problem, used differnt collets and finally used shims to get it right. If you look closely at the nut, one side has an area where there are no threads, this side goes towards the flywheel, but it's not quite deep enough to let it tighten up, so I just shimmed it up so it will tighten, Pooldoc
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Old 03-24-2008, 03:49 PM   #5
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Its the collet being too long, you will have to shorten the collet by grinding or cutting it down, alot of ppl have had this problem.
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Old 03-24-2008, 05:02 PM   #6
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This may be a dumb question, but is the engine turning over when you tighten down the clutch nut, I also remember running the clutch and there is a certain way to put the nut on.
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Old 03-24-2008, 06:05 PM   #7
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yes the engine is turning over when i tighten it. i know the nut only goes on one way...was just wondering if it would hurt anything to shim the collet or the nut between it and the flywheel..
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Old 03-24-2008, 06:12 PM   #8
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I tried that and it was less than ideal, the top shoe stuck out alittle and i didnt even end up trying to run it like that, its 100% the collet to big, try find a smaller one or mod it to suit.
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Old 03-25-2008, 06:09 AM   #9
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Quote:
Originally Posted by buckeye34 View Post
i have the "turbo twin" setup for my mbx5r. i am running a v-spec engine and i cannot get the flywheel to tighten up. it seems the nut will not tighten up all the way. i have tried different collets and still nothing. i have verified that what i ordered is "supposed" to fit the mugen. any ideas? is it that the v-spec is just different? i can put some washers between flywheel and nut but would that hurt anything?
I have been running the Fioroni clutch for a little over a year on several engines. It seems most collets I have tried are too long. I have taken the small end of the collet to the grinder to solve the problem.

Shimming behind the flywheel will adjust the clutchbell "placement" on the spur gear. I wouldn't suggest shimming under the flywheel nut, since this will move your clutchbell out in relation to your clutch shoes. I also don't use the brass washer included with the clutch. I use the large hardened steel Mugen diff washer and a .05 mm shim between the large washer and bearing. Then shim the bolt that holds the clutchbell accordingly.

This set up works well for me, hope this helps.
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Old 03-25-2008, 07:08 AM   #10
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i think i'm gonna shim the nut like you said. i tried and it tightened up but just worried that it may damage something...
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Old 03-25-2008, 10:43 AM   #11
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i had the exact same problem on my ceo mod v spec and i had to grind down the collet, it was too long and wouldnt let the nut tighten down, just grind some of the collet off the small end and it will be sweet
good luck and enjoy the clutch

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Old 03-25-2008, 02:15 PM   #12
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I used a Losi collet for their gas truck (it's shorter).
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