Clutch master cylinder

[BassAddict]

Just a quick question - do the B18 / 16 hydro clutches work straigh off the mini clutch master or will I need a different master cylinder ?
Cheers,
Rich

[Mark D]

They do but i found 2 problems by using a standard mini type cylinder

1) the pedal was very heavy with a very small amount of travel between it being on and off, this made it difficult to use.

2) the travel of the release bearing was too much. It was catching the boss of the friction plate and pushing it back onto the flywheel causing drag and not allowing the gears to engage smoothly. It was ok if you only pressed the pedal halfway down.

I cured it by removeing the mini type cylinder and replaceing it with a girling .625 cyl from demon tweeks and a remote reservoir

Mark D

[BassAddict]

Cheers Mark - I'll look into that - I'm really hoping to get the engine in and running over winter ready for some summer racing !!!
Rich

[MattG]

Cheers Mark - I'll look into that - I'm really hoping to get the engine in and running over winter ready for some summer racing !!!
Rich

hmmm .. winter is nearly over rich ! :)

Matt

[BassAddict]

And that was 2003 :shock: :shock: :shock: !!! Blimey I'm a slacker !!!! Think the never ending bodywork is getting on my nerves !!!
Rich

[evolotion]

LMAO .. bodywork takes to long :(

[MattG]

did not even see the 03 !!!! LOL

Matt

[BassAddict]

Perhaps I shouldn't have pointed that out :roll: !!! Oh well - probably got another 3 or 4 weeks work on the loft then I'm allowed to the garage again ! :)
Rich

[DaveCoxon]

You can't get smallet than that i think...

Different slave? :?

[MattG]

long shot :

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=23013&item=7960181118&rd=1&ssPageName=WDVW

[Geehawk]

Make the pedal longer ?

[Vtec Steve]

I bought a willwood one from rally design.

Steve

[MattG]

http://www.wilwood.com/Products/006-MasterCylinders/004-CRRMC/index.asp

[MattG]

http://www.tecno2.co.uk/brakes_listing.htm

[Minimivic]

I'm using a wilwood .625 on my car.

It works OK but the clutch is still heavy. I've tried modding the pedal ( longer) changing the fulcrums and lever ratio's and still its not like I would like.
I'm sure the honda master should be able to be used. and if I did another vtec its what i would use.
I'm convinced that using as much as you can from the donor vehical is good, its far easier than tring different cylinders and still not being happy.

Just my 2 pence. :D

[Mark D]

I'm sure the honda master should be able to be used

Wouldnt make any difference as the original honda master cyl is also .625 diameter. would also be harder to fit/locate as it is originally fitted horizontally

Mark D

[Mark D]

would be easier to fit a remote servo to the clutch line

[Mark D]

The clutch is almost like an on/off switch

How do you work that out darren, when you put your foot on the clutch it will develope pressure until it equals the clutch release pressure. It then maintains this pressure due to the clutch moving, should it stop moving the pressure will continue to rise. It is not an on/off device, a brake system works in the same way, the pressure overcomes the free movement then the pressure rises cos there is no movement left.

I cant see any reason why a remote servo wont work

Mark D

[Geehawk]

The clutch is almost like an on/off switch

How do you work that out darren,Mark D

Think Darren meant "his clutch" is like an off/off switch 'cos its heavy and he cant release it very gently.

Darren, I have a remote brake servo you can borrow, to test the theory out if you like.

[Geehawk]

Behind passenger side of dash/glovebox, or up inside the wings ??

[Mark D]

And in the meantime if you do get an on/off switch you could use it on the ignition :lol: :lol: :lol:

[jevs]

Stock honda bore should be 5/8" for the master cylinder. If that's what you got it should work fine I would think. I just went through all the brake and clutch calculations with Tilton to figure out what front, rear, and clutch master cylinders I will need with my setup.

[Minimivic]

Stock honda bore should be 5/8" for the master cylinder. If that's what you got it should work fine I would think. I just went through all the brake and clutch calculations with Tilton to figure out what front, rear, and clutch master cylinders I will need with my setup.

Yeh your right it should be ok, what the problem is the leverage ratios, the honda has a lot better lever than the mini. On the honda the pivot is at the top then a little way down is the master cylinder actuator pivot then the pedal is the lever which is quite long.

[D]

someone here asked if the honda B-series had been fitted to the firewall..

http://www.sandmracing.com/images/m/MINI/08/DSCF1346.JPG

http://www.sandmracing.com/images/m/MINI/08/DSCF1347.JPG

i'll give you some feedback when it's running.... in like, 3 years or so. :wink:

[MiniMike]

Darren, what did you end up doing to reslove the clutch feel??

[MiniMike]

Any pictures of the installation? or more info on exactly what you ordered? Thanks

Watsons change the std master cylinder on my mini for there own because it gave better clutch control and a lighter action. :D

[ErikGG]

Is it that the Mini's cylinder puts out too much pressure?
Erik

[ErikGG]

If there is too much pressure wouldn't a Brake Proportional Valve be used to reduce the pressure?
ErikGG

[ErikGG]

According to description of the valve, it can adjust between 100 and 1,000 psi and can reduce pressure up to 57%.
I am looking at SUM-G3905 from www.SummitRacing.com
Erik

[Mark D]

Is it that the Mini's cylinder puts out too much pressure?


Me thinks someone has reverse thinking :imstupid: . The Mini master cylinder does not produce enouch pressue. It produces too little pressure and moves too much fluid. By using a smaller master cylinder you reduce the surface area of the piston thus enabling it to create more pressure and move less fluid so a limiting valve is a totally poo idea

So as Darren has said before, smaller is better. Not sure what he was talking about on that occasion tho :roll:

[marco gooyaers]

Would it have a long enough stroke, that smaller cilinder?

[PaulC]

Darren,

If i were to buy this cylinder, do you know if it is the same threads as a girling .625 cylinder? so would it be a straight swap?

Thanks

PaulC

[marco gooyaers]

Cool. ill get one Darren. Sometimes i cant even feel my leg anymore^^


@ Darren. After the visit to Steve the mini seems the run a lot hotter. What could cause that, altered ignition timing?

Cheers

M

[ErikGG]

Darren,
Any pics yet?
ErikGG

[Geehawk]

I'd like to see a picture too please.

[Geehawk]

I'd like to see a picture too please.

You sad lot :P

Its a master cylinder!!!....when I next go down to the mini, I will take a couple of pictures!!

Any particular angle...the rear shot or top shot or inside and upwards :shock:

Definitely from the rear :shock: :wink:

[Mark D]

Definitely from the rear

Is that cos your only used to being behind graham???

[PaulC]

Well that was worth the wait!!! :lol: :lol: :lol: :wink:

[PaulC]

:lol: :lol: :lol: :lol: