Posted by Keith in Washington on Thursday, August 26, 2004 at 12:44PM :
In Reply to: Eddie posted by Paul(in NY) on Tuesday, August 24, 2004 at 7:50PM :
The amount of throw is determined by the relation in bore diameters between the clutch master and clutch slave cylinder. If the bore are identical in diameter the piston movement in both will be the same. If the master is larger in diameter the slave piston movement (throw) will be greater than the master. I had the opposite situation my master was too small for my slave and I was not getting the throw at the slave that I needed. I ended up changing both the master and slave to get the needed throw to disengage the clutch. It is common for the same slave or master cylinder casings to have different bores. They look the same on the outside but are different. It is common to see brake master cylinders with differing bores. I currently have two identical master cylinders (from outward appearance) but the bores are 1" and 1.25".
You also need to match the bores to the load being moved. You need a larger bore for truck applications or the peddle pressure would be too much as you are pushing against much beefier springs in the clutch plate.
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