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Clutch physics

G

gdp

Cruisin' Guzzisti
Joined
Jul 19, 2011
Messages
164
Location
Nashville, TN
If I remember correctly,....the larger the hydraulic piston/cylinder on the clutch-lever,... the greater the reduction in effort required, for the same result...At age 64, my clutch-hand is weaker,a deplorable fact...ANYONE...do you know of larger assemblies available, or solutions....I don't wanna ride a Mana...I LOVE this Stelvio...I mean, it's just hydraulic pressure that's required, there should be some kind of solution...GDP
 
Kevin.NZ said:
Hi gdp, I think if the piston size is doubled, the effort is halved but the piston travel is also halved.
cheers Kevin
Click to expand...

Close but exactly the opposite, halve the piston size & double its stroke to make it twice as easy, then you need really long fingers to make it all work. Larger bore slave piston could also be an option, there was one avalible for the Aprilia Mille Engine to make the clutch a bit less effort. you really need to make sure you get similar amount of fluid moved at the slave piston or the clutch will not fully disengage ...

cya
Scot.
 
Yup, half the leverage is twice the work or visa versa.

gdp, what year is your stelvio? I read another thread in which someone said that the new 2011euro (or 2010 can't remember) clutch is easier to actuate than the 08/09. The hydraulic part numbers are the same on the '09 and '11 the difference seems to be in the clutch assembly; that part is number has changed.
 
Hi Gdp,

Rafael and Scot are right.
When engaging your clutch is to heavy and you want to lighten it, use something with a smaller piston in your master cylinder, or a bigger piston in your slave cylinder (at the gearbox). ;)
The new(er) 8 valve engines have a lighter clutch, there are lighter springparts used.
But, unfortunality, you can't buy the parts separately. You have to buy a whole clutch...!! :S
I also had the problem of the heavy engagement of my clutch on my Griso 1200 (same engine).
I build radial master cylinders onto my Griso. B)
It is looking good and working, but not tried yet on the road because of our winterconditions.
Coming week I'm going to ride my Griso again, than I'll know if it's working in the way I want.
I wrote a topic in the "Chat and Tech info", "Carc": Heavy clutch 8V engines.
https://www.guzzitech.com/forum/196/7928.html
You can see pictures of my "solution". :idea:

Ad B
 
Hi Schimenator,

Guzzi calls them "the Belleville Springs" in their overhaul manual.

It are several spring parts which toghether form some kind of diafragme spring.
But not seperately available... damn... :evil:

Ad B
 

Attachments

  • Griso 1200 8V clutch.jpg
    Griso 1200 8V clutch.jpg
    93.6 KB · Views: 305
...truth is..because I'm 'cheating' a bit with my clutch hand, I'm slipping the clutch more than I would like, ergo, maybe I'll spring (no pun) for a new clutch this winter...Thanks, again,....You guys are amazing....
 
...to get a sense of a baseline force requirement, I dropped by my buddy's place and pulled the clutch lever on his 02(?)LeMans...damn! It was significantly easier 'clutch-pull'...He and I agree that I'm way over into 'old' Ducati territory for stiff clutch...Gonna clean system, lube pivots, do a rain dance,and price a clutch replacement...presumably, a new clutch will be the revised spring-rates... :
 
Ad B said:
Hi Schimenator,

Guzzi calls them "the Belleville Springs" in their overhaul manual.

It are several spring parts which toghether form some kind of diafragme spring.
But not seperately available... damn... :evil:

Ad B
Click to expand...

That looks downright automotive.
 
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