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Originally Posted by pneumo
If you want to make the difference between the master and the slave bigger, then why recomend the slave that's closest in size to the master? Wouldn't the smallest slave cylinder make the pedal effort harder? I would think a bigger slave would make the effort lighter.
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You are right in your thought the bigger slave would make the effort lighter. Here is my reason for recommending the smaller slave: I'm speculating that Starion will be running a high clamp load clutch. We all know how the pedal effort is with say a 2600. There is also the issue with the clutch pedal and pedal assy. It needs welded and yet it still has some flex issues. People start adding the longer pushrod or modifiying other parts to help with the disengagement. That only preloads the throw-out bearing and will cause excessive wear. (If you don't believe me, I've got pics. I've got over 50K on a 2600 on my 90 and it's got some interesting wear on the pressure plate fingers. )
With the 2600 overstressing the pedal assy, most of you will find you use the entire range of the pedal, just to make it work. As you push the pedal through it's throw, you are changing the effective pedal ratio. As you stroke the pedal forward the ratio decreases. Thus, as you hit the end of the pedal swing, it's ratio is at it's smallest point. This just further increases your pedal effort.
By using the smaller slave, you will be increaseing the output of the system. The release lever will travel through it's motion quicker than before. Moving back to the pedal, this means you will disengage sooner.
The inital pedal force might be greater with the 13/16 slave, but the pedal force at the end of stroke or disengagement point should be less, due to the pedal ratio at that point.
And you get to stear away from the longer pushrod type remedies and premature pressure plate wear.