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Hydraulic clutch

S

Shrinkdude

Member
Wanted to share what I am doing on mine.
I made a bracket out of 3/8" steel bar stock I had laying around my shop.
Pull type slave cylinder from Speedway motors
rod end I got from Grainger
Grade 8 bolts and nuts
Braided line to master

Question I have: Does the bore need to match the master vs slave or is there an offset?
I believe the slave is 3/4" and the master I have from a car I pulled it out in the junkyard is 5/8"
 
"Shrinkdude" said:
Wanted to share what I am doing on mine.
I made a bracket out of 3/8" steel bar stock I had laying around my shop.
Pull type slave cylinder from Speedway motors
rod end I got from Grainger
Grade 8 bolts and nuts
Braided line to master

Question I have: Does the bore need to match the master vs slave or is there an offset?
I believe the slave is 3/4" and the master I have from a car I pulled it out in the junkyard is 5/8"
Click to expand...

It depends on the stroke length of the master and how far you have to stroke the clutch to disengage it.

When I first did my conversion I used a Wilwood 3/4 master and a CNC 7/8 slave. The stroke on the master was 1.1 IIRC, and the slave needed to be stroked about 1.25 inches.

Because the slave bore was larger than the master bore, the slave was actually stroked less than the 1.1 stoke of the master. I think it was stroking around .8 inch.

I stepped up to a 7/8 master and solved my problem of the clutch not full disengaging.
 
Thanks for the info
After re-reading the specs of the slave cylinder I have it appears to be the 7/8" bore. I thought it was 3/4" at first and figured the 5/8" master I pulled from the junkyard months ago would work. I guess I will search out a 7/8" bore master before reworking the firewall for this 5/8" one I have.
 
This is the reason we desinged and build our Modern Driveline LF (Light Foot) series hydraulic kit for the 65-70 Mustangs. All the brackets are includeds with he proper linkage and firewall support. No need to guess on what size cylinders to purchase and if the clutch will release. If the cylinders sizing is off, the pedal effort is too high and will release or too soft and won't release completely.
 
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