Hello peeps...
Having just made a nice shiny adaptor to fit a hydraulic clutch into my MT75 box I now need to size up a master cylinder. Thing is I don't know
the size of the Mondeo ST24 slave I'm using. I can't just measure the piston diameter cos a) it's a concentric clutch so it's a
ring shaped piston, and b) it's unaccessable anyway.
Anyone got any clever ways of finding out the volume in the piston?
Cheers,
Liam
Fill it with fluid, pour it out and measure it in a measuring jug or some of those cookery measuring spoons. Or if you can get one, a syringe.
Wow, this brings back memories.
My first ever real post on Locost builders ( as type 907, as I was then)
"I've fitted a Mondeo slave.... what master cylinder should I use"?
No bu**er answered it then. 
There's no way I'm going to admit what part solved my problem, or what car it came off.
but the door handles were used on Range Rovers.
Paul G
Just work on the principle that I use, guesswork!!!
Every hydraulic clutch that I have ever chucked together (well, that is three runners now, plus one awaiting!) has used a 3/4" master cyl to good
effect.
STOP PRESS - funnily enough, just looked on brakes international site, and sure enough my hunch was indeed correct, the mondeo master cyl is indeed
19mm!
nice the be right at 1:19 am!!
g'night!
The Girling cylinders that every old triumph and BMC car used should do the trick. Old Metro or Mini, Dolomite etc. should do it.
Yep, certainly the BL ones are 3/4" (slaves are 7/8"
, dunno on the others but I guess they are too.
[Edited on 15/2/06 by NS Dev]
Cheers fellas...
So any idea what the pedal ratio is on a Mondeo clutch pedal then?
Cheers
liam
.......shall I get the moon on a stick while I find out!!! LOL!!!
Sorry mate, no idea I'm afraid, but again using my really technical guessing system seems to have worked well in the past, just made it look
right!
I would "guess" that the average clutch needs around 18mm release mech movement in total allowing for wear, seeing as that's the stroke
of the average concentric cyl. If the master cyl is say 7/8" (mini one) then you'll need around 20mm of master cyl movement, so set the
pedal up to give you say 22-24mm of total m/cyl movement through an acceptable arc and you'll not go far wrong.
.............incidentally reminds me of a lovely agricultural solution we used on a buggy years ago!!!
We were building it on a chassis no too dissimilat to a locost in the transmission tunnel/bulkhead area, and consequently were short of room for the
clutch release arm.
The simple clutch release solution was to weld an extension onto the release arm, and use a very light spring to hold the arm against the clutch to
stop it rattling.
The clutch pedal was just the arm then!!! Push the arm with your foot and hey presto......don't get much simpler!!
quote:
Originally posted by Liam
Hello peeps...
Having just made a nice shiny adaptor to fit a hydraulic clutch into my MT75 box I now need to size up a master cylinder. Thing is I don't know the size of the Mondeo ST24 slave I'm using. I can't just measure the piston diameter cos a) it's a concentric clutch so it's a ring shaped piston, and b) it's unaccessable anyway.
Anyone got any clever ways of finding out the volume in the piston?
Cheers,
Liam