Liam
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| posted on 14/2/06 at 11:10 PM |
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Hydraulic clutch piston measuring...
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
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nitram38
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| posted on 15/2/06 at 12:05 AM |
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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.
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907
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| posted on 15/2/06 at 12:49 AM |
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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
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NS Dev
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| posted on 15/2/06 at 01:19 AM |
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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!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Peteff
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| posted on 15/2/06 at 11:03 AM |
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The Girling cylinders that every old triumph and BMC car used should do the trick. Old Metro or Mini, Dolomite etc. should do it.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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NS Dev
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| posted on 15/2/06 at 11:04 AM |
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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]
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Liam
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| posted on 15/2/06 at 11:38 AM |
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Cheers fellas...
So any idea what the pedal ratio is on a Mondeo clutch pedal then?
Cheers
liam
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NS Dev
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| posted on 15/2/06 at 11:46 AM |
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.......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.
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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NS Dev
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| posted on 15/2/06 at 11:56 AM |
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.............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!!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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geordielad
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| posted on 31/1/12 at 05:42 PM |
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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
i know its a very old post but do you have any photos of the adapter you made and how it was fitted
thanks in advance
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