Master / Slave measurements
Thread Starter
Joined: Jun 2004
Posts: 221
Likes: 0
From: College Station, TX
Master / Slave measurements Howdy,
I'm trying to understand my problem with my hydraulics / clutch setup (not disengaging fully).
Decided to measure some things (took apart some old slave / masters).
OEM Master (3/4 in) - Un-installed, full stroke
Stroke 1.06 in *un-installed full range of travel
O.D. 0.75 in
Wet area 0.44 in2
Volume 0.47 in3
OEM Master (3/4 in) - installed stroke (doesn't bottom out in my car)
Stroke 0.75 in
O.D. 0.75 in
Wet area 0.44 in2
Volume 0.33 in3
OEM Slave
Range 0.96 in
O.D 1.86 in
I.D. 1.43 in
Wet area 1.11 in2
Volume 1.07 in3
Factory Master / Slave ratio 3.2 (3 strokes in car to fully move slave through travel.
So, why would a shim be needed? In my case i am at 0.29in installed and could shim it to make the gap smaller, but my problem is that the clutch is disengaging at the floor. I am not at the end of the trow out bearing. Shimming it would not increase the pedal stroke, so a larger stroke or larger master bore would be needed.
Unless someone can point out the error of my ways, i plan on ordering a Tick master on monday.
James
I'm trying to understand my problem with my hydraulics / clutch setup (not disengaging fully).
Decided to measure some things (took apart some old slave / masters).
OEM Master (3/4 in) - Un-installed, full stroke
Stroke 1.06 in *un-installed full range of travel
O.D. 0.75 in
Wet area 0.44 in2
Volume 0.47 in3
OEM Master (3/4 in) - installed stroke (doesn't bottom out in my car)
Stroke 0.75 in
O.D. 0.75 in
Wet area 0.44 in2
Volume 0.33 in3
OEM Slave
Range 0.96 in
O.D 1.86 in
I.D. 1.43 in
Wet area 1.11 in2
Volume 1.07 in3
Factory Master / Slave ratio 3.2 (3 strokes in car to fully move slave through travel.
So, why would a shim be needed? In my case i am at 0.29in installed and could shim it to make the gap smaller, but my problem is that the clutch is disengaging at the floor. I am not at the end of the trow out bearing. Shimming it would not increase the pedal stroke, so a larger stroke or larger master bore would be needed.
Unless someone can point out the error of my ways, i plan on ordering a Tick master on monday.
James
Old post but FWIW my F-body FSM claim you're supposed to have 0.43" (11 mm) of slave stroke. That alone could explain your lack of disengagement.
BTW, thanks for all the info... It helped a lot on a different clutch hydraulics issue.
BTW, thanks for all the info... It helped a lot on a different clutch hydraulics issue.
