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  #1 (permalink)  
Old 08-22-2007, 04:10 PM
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9/16" clutch master cylinder bore?

I am going to use a Jaybrake Tranz Brake on my custom and I need a 9/16" clutch bore. I already have HD controls and was hoping to use a HD clutch master cylinder but they only make a 11/16". Does any one know of a company that makes the 9/16" that matches the HD controls, or do I need to get a complete new set of controls? Thanks TT
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Old 08-22-2007, 04:27 PM
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I would check with Jaybrake they should work with the larger m/c usaully too big will ok but too small wont fully disengage the clutch. Companies like PM and Brembo only offer 11/16 m/c too but they have adjustable stops on the levers to limit the travel maybe you could devise something like that if they say he 11/16 will push too much fluid for the hydraulic clutch
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Old 08-22-2007, 05:13 PM
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The diameter not only presents volume but also the amount of hydraulic pressure that can be developed per amount of hand pressure.

Hand levers produce a certain amount of throw and pressure at the M/C. A small M/C will produce a higher pressure for a given input, where a larger diameter M/C will produce a lower pressure and higher volume. Double check with JayBrake. They should have a solution.

All a matter of knowing what pressure/volume is needed at the slave and matching with a M/C that provides the needed volume/pressure.
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