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On 4 Sep 2003 at 8:22, Russ wolfe wrote: > I doubt if it is that much higher. You are going to a lot of extra work > to calculate it. Figure the square inches of the master cylinder and the > slave. Mine are 3/4" bore. The one in the ISP picture looks like they > are both the same bore.Use a bathroom scale to calculate the force > required to operate the pressure plate. Calculate the leverage length of > the release arm and the clutch pedal. Clamping force of the clutch has > nothing to do with it. It is pressure needed to release it. Now that you mention it, Russ, I have to agree with you (assuming that above you meant to say "Use a bathroom scale to calculate the force required to operate the pedal.") After that, you just have to figure your mechanical advantage like you say, including any hydraulic advantage, and you're pretty much done. The only drawback to this is that you have to have a working system to make the measurements on. It won't work for a new design; then you would need to work forwards from the pressure plate to see what was necessary and design in enough mech advantage that the average driver could manage it. BTW, did anyone else catch the thread on RAMVA a few weeks ago when John Connelly mentioned that VW used different length actuating arms in different years and they compensated for this by also using different length arms on the clutch pedal shaft? I had known about the tranny end change, but I had always thought that the pedal clusters were all alike. Knowing this, we can mix a late tranny case with an early pedal cluster and get an easier acting clutch. Apparently this is a combination that VW never did, but I accidentally did this a few years ago on one of my daily drivers. I THOUGHT it seemed unusually nice, but I thought this was just how they ALL were after the late tranny case was introduced. John confirms that this is a nice combo, especially with a heavier than stock clutch. Just switching to the late case with the long clutch arm also takes some load off the cable. -- Jim Adney jadney@vwtype3.org Madison, WI 53711-3054 USA ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org