> You won't do it with air, I'd bet. The difference between air and fluif
> is that one is compressible, the other is not (for our purposes). You can
> put air pressure in until the cows come home, and I wouldn't think you
> could move the arm enough to see anything.
I disagree - you could certainly do it with air, if you have enough
pressure. The relative compressibility of the two fluids is immaterial -
pressure is pressure. The problem is, your home air compressor will
probably produce not more than 125 psig and this will not be enough.
> If you do the arithmetic...I guess it takes about 300 pounds to compress
> the springs on the pressure plate. I guess the piston in the slave
> cylinder is about 3/4" in diameter, making the area somewhere around 0.44
> square inches. There may be some mechanical advantage in the fork lever,
> but I don't think it's a lot. So you're looking at maybe 600 pounds per
> square inch in the pipe, delivered from your pedal. Can that be right?
> (The pedal, of course, has a huge mechanical advantage.) Don't forget the
> losses due to friction!
Yes, I would guess it is in the 300-600 psig range - I came at it from the
opposite direction, however. I assume that the effort required to operate
the clutch pedal is about 50#, the mechanical advantage has got to be 4 or 5
to 1, so, if the clutch piston is .44 sq ins then the pressure in the
hydraulic system would be 400-500 psig.
Mike
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