"Think about it this way: If the master and slave cylinders were the same
size, the force of your foot would be what is driving the clutch. As the
size of the slave is reduced and the master left alone, the resulting
pressure on the clutch would increase. Therefore, smaller creates more
pressure
in relation to the master. I can't find any fault with that argument."
Don't confuse pressure with force. The force generated on a piston is equal
to the hydraulic pressure times the area of the piston. Conversely, the
hydraulic pressure generated by the master cylinder is the input force on
the cylinder divided by the area of the cylinder acting on the hydraulic
fluid. Since the force created at the slave is equal to the hydraulic
pressure times the area of the piston, a smaller slave cylinder results in
less force exerted on the clutch for a given pressure. So, if a smaller
slave cylinder is used, more FORCE will be required at the clutch pedal to
exert the same amount of force at the clutch. The trade off is pedal travel.
If the cylinders are of equal area, piston travel will be equal. If the
slave cylinder area is smaller, it will exert less force for a given input
force at the master, but will travel farther.
Walt
TR6 wannabe
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