A4 Fluid Clutch

[RALPHARAMA]

I want to make a fluid clutch for my A4 custom build. Ideally I want matching but not too modern master cylinders and ideally fairly invisible.

Venhill do a system that uses the original release mechanism, but the master cylinder is too modern for what I have in mind.

I used a GPZ900R set up on CB's 650 which worked well enough, but I want to hide the slave this time and not machine the shit out of the final drive cover if at all possible.

I also like the idea of making my own slave, but ideally could do with something to get ideas from.

Any thoughts?

[chrisu]

Ralph

Zrx or GSX1100 ones look too modern ?

Also the Falk slave cylinder sits behind the cover so you don't see it. Just get one of those....

[RALPHARAMA]

Rex ones should be fine.

Has anyone got any pictures and measurements of the how the Falk system works. It's not a meanness thing I would just really like to have a go at making my own slave cylinder. I reckon the only really hard bit will be cutting the seal groove, but I can make a tool to do that. I think that the secret is getting the size of the slave cylinder piston/bore correct to achieve the correct mechanical advantage.

[sanderz]

[quote="RALPHARAMA"]
Has anyone got any pictures and measurements of the how the Falk system works. /quote]

Ive no experience of the set up but found this post from some years back which has a decent photo from one of GBs builds
viewtopic.php?f=18&t=32851&p=279935&hilit=falk#p279935

[RALPHARAMA]

Thanks for all the help.

With the pix and useful research I can now make one.

I was toying with a ZRX master cylinder. I check with the wholesalers and discovered that the Rex repair kit is the same as the 900R, so I have ordered a pair of master cylinders from a second year 900R from DK.

The nearest bit o bar I had was 75mm so the first job was to turn it down to 65mm. I need to do a few drawings and get some more dimensions from a 900R slave piston or Rex one. It can be up to 40mm deep and still clear everything.

I don't suppose anyone has one they could take some pix of and let me have some dimensions ?

[chrisu]

you can look at my falk slave cylinder and take your own measurements

[RALPHARAMA]

I had a look at the cost of a new GPZ900R slave piston on Cradley Kwaka and given how reasonable it is I thought I'd buy one and save myself some time machining stainless.

I'm going to make it similar to the Falk one, but I'm going to machine off more 'unnecessary' material to make it lighter and more 'production'. I know no one but me will see it, but I'll know!

Does the Falk have a locating 'stub' on the back to mate with the hole for the original activator in the cover?

[chrisu]

see my reply above...