If, that pressure plate clamping force is 1800 lbfs (not PSI), then assuming the diaphram spring arms are 6:1, that would be 300 pounds at the TOB.
using your observed 300 PSI applied to the 1" bore slave would give (300 X 0.787 =) 236 lbFs at the release leaver and (236/0.725 =) 325 lbFs at the TOB
using the 300PSI applied to the 3/4" MC bore would give (300 X 0.443 = 132; 132/7 =) 19 lpf at the pedal
Thanks Jack, it is begining to make sense to me!
What makes your clutch unique?
To me, it looks like the clutch mfgs would provide the release stroke (I would think it would vary some my mfg) since nearly all clutch linkage are a set amount and not too adjustable
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