Clutch Slave Cylinder Diameter
Posted: Tue Dec 15, 2015 2:36 pm
I have had a new slave cylinder picked up for a song lurking in my garage for some years, and as the one on the car had started leaking I thought I would fit it.
It turns out that when comparing the two, the new one is for a cortina and is 3/4 inch diameter, and my old one is 7/8 inch. All other important dimensions look the same.
If I fit this slave cylinder the effort to operate the clutch will go up, but by how much? Has anyone tried this setup? How does it feel?
As the clutch fluid is incompressible the slave pushrod will move further, at a ratio of radius1 squared/radius2 squared (the volume displaced in the slave is pi x radius squared x length).
That means that if the 7/8 inch pushrod moves, say 10mm, then the 3/4 inch pushrod will move 13.6mm.
This may be OK if the cortina used the same release arm, clutch spring diaphragm etc., otherwise I might do some damage.
Any thoughts?
Dave Chapman.
It turns out that when comparing the two, the new one is for a cortina and is 3/4 inch diameter, and my old one is 7/8 inch. All other important dimensions look the same.
If I fit this slave cylinder the effort to operate the clutch will go up, but by how much? Has anyone tried this setup? How does it feel?
As the clutch fluid is incompressible the slave pushrod will move further, at a ratio of radius1 squared/radius2 squared (the volume displaced in the slave is pi x radius squared x length).
That means that if the 7/8 inch pushrod moves, say 10mm, then the 3/4 inch pushrod will move 13.6mm.
This may be OK if the cortina used the same release arm, clutch spring diaphragm etc., otherwise I might do some damage.
Any thoughts?
Dave Chapman.