skidude88
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| posted on 12/5/08 at 10:28 AM |
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MC bore identification
Could anyone tell me how you determine the M\C bore size?
I've gone for a remote reservoir and got Wiwoods tandem cylinder, as it came with everything (1" bore)
I've no Idea what the original cylinder is off
posted before for pics :
http://locostbuilders.co.uk/viewthread.php?tid=75913
Part# on casting is 64676774. I've been told it looks like Escort\Capri, (reservoir is pushed in and screwed to the casing at the push rod
end)
With the new M\C in place there little to no brake pedal travel before the brakes are fully on, (Not sure how I'll get on with a binary
brake)
I knew the bore size would be wrong, a little out and took a flyer on it, but wasn't expecting this 
Would anyone have spec\info on old ford M\C and or any info how to determine its bore?
Regards
James.
Early MK de-Dion CBR1000 FJ-FP.
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02GF74
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| posted on 12/5/08 at 10:54 AM |
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can you not remove the dust cap if there is one and measure the bore?
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JAG
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| posted on 12/5/08 at 11:13 AM |
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quote:
I've gone for a remote reservoir ............... as it came with everything (1" bore)
I don't understand. You ask how you determine the bore size but it looks like you already know.
In your post you say it's 1" bore (25.4mm) and if that's right then I'm not surprised the brakes are fully on so quickly. Do
you have a servo/booster fitted?
You need a smaller diameter, 19.05mm (3/4" ) or 17.8mm (5/8" ) would be good choices. I'd probably go 17.8mm myself, especially if
you DON'T have a servo/booster.
[Edited on 12/5/08 by JAG]
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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skidude88
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| posted on 12/5/08 at 11:39 AM |
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I know the bore size of the new M\C but not the original.
I just wanted to determine how far out I was.
Early MK de-Dion CBR1000 FJ-FP.
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JAG
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| posted on 12/5/08 at 12:40 PM |
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Ok - now I understand.
The MkII Escort was a 19.05mm bore (3/4" ) for all models except the RS2000 and that was a 20.64mm.(13/16" )
This data taken from the Lucas (Girling) Aftermarket service parts manual 
I hope that helps.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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britishtrident
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| posted on 12/5/08 at 02:51 PM |
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1" inch bore is far to big you would have push about 300 pounds on the pedal to get a 1g stop
Small master cylinder bore = less pedal force required.
Ideally you want a 0.7" bore this was Westfield used (originally it came from the Triumph Spitfire 1500). This is available as a Westfield
part from the Westfield on line shop or from Brakes Int web site.
Most British cars of the 1970s which didn't have a servo use a 0.75" bore -- but they had much more pedal leverage than the Locost foot
well allows.
Most Fords with servo use a 0.81" bore (ie 13/16"
If you look up the Brakes Int web site you will find the bores of brakes cylinders in mm.
[Edited on 12/5/08 by britishtrident]
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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britishtrident
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| posted on 12/5/08 at 02:56 PM |
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Forgot to add it is the area of the piston that counts.
Eg 1" bore will require more than twice the pedal force of a 0.7" bore.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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skidude88
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| posted on 12/5/08 at 03:55 PM |
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Cheers,
Sigh!
"Standard tandem brake master cylinder" on westfield website doesn't list bore size
I've just given them a ring and the guy has no idea and cant help.
....Anyone??
Don't wanna assume its the .7 you've referred to.
I got the wilwood as it had the remote reservoir mount kit, figured it wouldn't be far out.
As for "other" ford\triumph MC, I need a quick fix to remote mount reservoirs.
Been a few posts on here, but all seem a bit hit and miss as far as getting the hose to fit connect to the cylinder.
If someone could say, this part# from here with this part# from here that would be great (the downside of locosts = no part#)
[Edited on 12/5/08 by skidude88]
Early MK de-Dion CBR1000 FJ-FP.
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