Reply to "Clutch master smaller diameter replacement"

quote:

Posted December 14, 2010 11:14 AM Hide Post
COMPRESSIBLE FLUID ?????? Never heard of that before ! I will have to tell my kids... they won't believe you.
Boss, can you give some details for a Belgian idiot ?
:>
Pat
Posts: 44 | Location: Brussels | Registered: August 21, 2005 IP

Ignored post by Candy2862 posted December 14, 2010 11:14 AM Show Post

Bosswrench
Posted December 15, 2010 11:55 AM Hide Post
I've been out of the chemical engineering game for a century, but my understanding is, silicone fluids used in hydraulic systems are made up almost entirely of twisty long-chain molecules with no carrier fluids, and under high pressures, the chains straighten and align, allowing the fluid volume to compress a few percent. This is enough to contribute to a mushy pedal, along with more shrinkage from compressing the entrained micro-air bubbles that CANNOT be bled out. Weird, but then all silicone chemistry is weird anyway, compared to carbon-based chemistry...
As an addendum to my post above, the stuff probably will work in a hydraulic clutch since we only see about 150 psi in a typical Pantera master/slave system- too low to cause the fluid to compress very much. But given the amount of trouble inherent in Pantera clutches anyway, I wouldn't use the stuff there myself.
Posts: 1342 | Location: Minden NV | Registered: December 22, 2002 IP

Ignored post by Bosswrench posted December 15, 2010 11:55 AM Show Post

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