Joe Curry wrote:
> Someone (who is supposed to know these things) once told me that if you
> use a smaller wheel (or slave) cylinder, you will actually get a higher
> pressure than if you use a larger one.
The person who told you got it backwards. Basic hydraulics says that the
force exerted by the slave cylinder is the pressure in the fluid times the
area of its piston. The pressure in the fluid comes from the master
cylinder, and is the force exerted on the piston divided by the master
cylinder's area. Inotherwords, a smaller master cylinder means greater
pressure, but a smaller slave cylinder means less force at the business end.
The tradeoff is that the ratio of forces is inverse to the ratio of
displacements. A small master cylinder means your pedal moves further; a
smaller slave cylinder means your pedal moves less. This result is because
the volume moved at one end must equal the volume moved at the other.
Jim Muller
jimmuller@pop.rcn.com
'80 Spitfire (Percy)
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