Wilwood Clutch Master Cylinders

[turbo90gsx]

I recently brought this up on a local board, and I'm wondering how this board feels/knows about possibly using a Wilwood Master Cylinder in our cars. I have been aiding in my friends LS1 RX-7 swap the past month and have seen that he will be using one of these master cylinders on his car (the RX-7). I'm not a fluid pressure/displacement genius but I do know that a larger piston will displace a larger volume. However I'm not sure how this would affair with the stock sized slave cylinder. The point of installing this would be aimed at a clutch like the ACT 3200 that requires a much higher pressure to disengage then say a 2600 witch is already a bear. Could the larger bore in the master cylinder aid in building that extra pressure while still keeping the pedal effort down? Also another added bonus to using this is the ability to run a -4 line from the master all the way to the slave for an added stainless line under the hood .




http://www.wilwood.com/Products/006-MasterCylinders/005-CSBMC/index.asp

 

[Elvenhome21]

for that type of clutch you want the smallest size possible that still provides enough throw.
The smaller the diameter of the master the more mechanical advantage you achieve, but the down side to this is you need to move the pedal more distance (possibly not enough) to disengage the clutch

this is an explaination of brake force which is the exact same for clutch force

PEDAL RATIOS / MECHANICAL LEVERAGE:

Pedal ratio, or mechanical leverage is the ratio calculated from the length from the pivot point of the pedal to the center of the foot pedal (A), divided by the length from the pivot point to the master cylinder pushrod (B). Refer to the figures below.

Mechanical leverage is simply a means of increasing the brake force without increasing your leg effort. As "A" gets longer and "B" gets shorter, the mechanical leverage increases brake force without pushing harder on the pedal. The disadvantage is that the pedal stroke also increases, requiring you to push the pedal further.

With a 1" master cylinder stroke, a 100 pound push on the pedal, and the pedal having a 4:1 ratio, the force is 4 x 100 = 400 pounds, and the stroke is 4 x 1 = 4 inches. With a 100 pound push on the pedal, and the pedal having a 6:1 ratio, the force is 6 x 100 = 600 pounds, and the stroke is 6 x 1 = 6 inches.

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