[V8Vairs] Travel] Hydraulic Clutch Question

[Sadek Charles H DLVA]

Correct-However, keep in mind the impact of the lever ratio of your clutch
arm, pedal arms, etc.  What Tom quotes, is exactly what Tilton says.  They
also admit (over the phone) they are not considering the clutch arm ratio
and possible resultant effort required to actuate a heavy clutch.  The quote
below also leaves out the required pedal stop, which limits MC travel, and
if the travel is within the slave cylinder travel limits, the resultant
throw out bearing travel IF too great, might over center some clutch
diaphragms. That is exactly what a pedal stop is for.

A Tilton 7.25 Diameter two-plate clutch assy, has .2" clearance before
contact, begins disengagement at .180" after contact, and complete
disengagement is spec'd at .220".  So, it doesn't take much to over-center
it.  Therefore, regardless of MC/slave ratio, the clutch arm travel at the
throwout bearing is critical and must be limited by a pedal stop.

Good Luck

Chuck S

-----Original Message-----
From: Thomas Robert R Civ 76 PMXG/MAEAPF
[mailto:Robert.Thomas at tinker.af.mil] 
Sent: Thursday, June 30, 2005 12:27 PM
To: v8vairs at corvair.org
Subject: RE: [V8Vairs] Hydraulic Clutch Question

"What bore size would be good for a slave cylinder of 15/16" ?"

15/16"....  "Nearly every clutch master cylinder is matched for size to its
connected slave cylinder for a 1-to-1 relationship. So, a 3/4" bore master
cylinder should only connect to a 3/4" slave cylinder. A 1" master should
have a 1" slave cylinder. A master cylinder that is larger will yield a
rather spectacularly blown out slave cylinder and a master cylinder that is
smaller will yield a rather disappointing lack of travel for your left
foot's efforts."
http://www.novak-adapt.com/knowledge/clutches_etc.htm