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cllutch Master cylinder 0.70 or 0.750

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hondo402000

hondo402000

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I am thinking about replacing the clutch MC, currently its a 0.70, I was thinking about going to a 0.750, I read on one post going to a larger bore will cause the peddle to have a stiffer feel, It that right I would have though it would be softer with a larger bore?
 
Your thoughts are correct Hondo.---Keoke- /ubbthreads/images/graemlins/yesnod.gif
 
I've got one of each -- can't tell the difference.

All other things being equal (& perhaps they are not)... would the .75 give you slightly more travel at the slave cylinder?
 
It depends on whether there is any extra travel available in the slave cylinder. The volume of fluid displaced in the master cylinder is equal to the volume of fluid displaced in the slave cylinder. (provided your fluid line doesn't expand too much) A larger bore in the master cylinder means more fluid is displaced for each increment of distance the MC shaft moves. If the SC inner diameter remains the same. The SC shaft should move slightly more per increment of distance the MC shaft moves using a .75 ID MC than it did with the .70 MC. I think this translates into a slightly stiffer pedal. Without calculating the volumes I can't say for sure how much, but I think it is less than 10%, which is hardly noticeble. (I sure hope I remembered all that correctly!)
 
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I've got one of each -- can't tell the difference.

All other things being equal (& perhaps they are not)... would the .75 give you slightly more travel at the slave cylinder?

[/ QUOTE ]

With such a small difference in the bores of these cylinders to the user very little change would be apparent. However, we must realise that as the piston size gets larger the pressure per unit area goes down.--Fwiw---Keoke
 
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