GRiSO ghetto
Would you like to react to this message? Create an account in a few clicks or log in to continue.


12425 - Established June, 2013 - all GRiSO, all the time...
 
HomeRegisterLog in
 

 How much clutch lift?

Go down 
3 posters
AuthorMessage
lcjohnny
GRiSO Capo
GRiSO Capo
lcjohnny

Posts : 477
Join date : 2016-01-25
Age : 66

How much clutch lift? Empty
PostSubject: How much clutch lift?   How much clutch lift? Icon_minitime1Sat Jul 31, 2021 11:07 am

Hi does anyone know how much the clutch is actually lifted on a 2009 1200?

I need to get a clutch command piston machined down to fit inside the thrust cylinder bore.
So i need to understand
1) how much the piston moves for a full lever movement
2) how much extra to allow for clutch plate wear

Does anyone have those figures or is anyone able to guesstimate?
Back to top Go down
Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper

Posts : 8321
Join date : 2013-05-29
Age : 64

How much clutch lift? Empty
PostSubject: Re: How much clutch lift?   How much clutch lift? Icon_minitime1Sat Jul 31, 2021 11:50 am

Not very much at all. A memory two max id think. It should be easy enough to calculate. What is the sixe of the master? What is the size of the slave?

lcjohnny likes this post

Back to top Go down
lcjohnny
GRiSO Capo
GRiSO Capo
lcjohnny

Posts : 477
Join date : 2016-01-25
Age : 66

How much clutch lift? Empty
PostSubject: Re: How much clutch lift?   How much clutch lift? Icon_minitime1Sun Aug 01, 2021 2:44 pm

I cannot get at the master cylinder bore or piston to measure it without destroying the dust cover. and needing to rebuild it:(

From outside It looks like a 12mm bore (but that design could be 15mm) & the pump stroke is 12mm.

If it is a 12mm bore the clutch pump will move the standard 25mm "command cylinder" piston by 2.8mm. (& if is a 15mm bore it will move it by 4.3mm).

I cannot find the acceptable minimum for the clutch plate so i will assume 1mm total wear (0.5 on each side).

In that case i need to plan for up to 6mm of the command piston to enter the thrust cylinder bore.

If anyone spots an error im my understanding or calculation = please say
Back to top Go down
paulbrice
GRiSO Capo
GRiSO Capo
paulbrice

Posts : 1142
Join date : 2015-01-04
Age : 60

How much clutch lift? Empty
PostSubject: Re: How much clutch lift?   How much clutch lift? Icon_minitime1Sun Aug 01, 2021 3:11 pm

Couple of thoughts (no idea if any help), sadly I scrapped my old clutch master...:

1. The range of variation for the clutch control rods is up to 4.5mm (in the workshop manual)
2. V50 clutch limit is -1.5mm (new is 8mm, replace at below 6.5mm)
3. If you put the part number for GRiSO clutch mastercylinder (for mine at 2009  AP8106713; newer may be different) and trawl you can find stuff that says it is 12mm ....example below (at this link  Aprilia forum )

[You must be registered and logged in to see this image.]
Back to top Go down
lcjohnny
GRiSO Capo
GRiSO Capo
lcjohnny

Posts : 477
Join date : 2016-01-25
Age : 66

How much clutch lift? Empty
PostSubject: Re: How much clutch lift?   How much clutch lift? Icon_minitime1Sun Aug 01, 2021 4:24 pm

That is very useful Paul as it agrees with traces that i have found. For example i got a pdf of one page of the engineering schematic for Brembo PSC-12 10-7770-11 and it looks exactly like mine.
Happy to upload it if anyone else thinks it would help them

So 12mm bore means 2.8mm clutch lift as standard and 2mm with the larger Oberon slave cylinder.
And (if i can make it work) a 30% reduction if lever pressure.

Thanks


Last edited by lcjohnny on Mon Aug 02, 2021 6:28 am; edited 1 time in total
Back to top Go down
paulbrice
GRiSO Capo
GRiSO Capo
paulbrice

Posts : 1142
Join date : 2015-01-04
Age : 60

How much clutch lift? Empty
PostSubject: Re: How much clutch lift?   How much clutch lift? Icon_minitime1Mon Aug 02, 2021 1:43 am

The hopes of many left wrists go with you jon Wink

lcjohnny likes this post

Back to top Go down
 
How much clutch lift?
Back to top 
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
GRiSO ghetto :: The Ghetto :: GRiSOLOGY-
Jump to: