I replaced the 0.70 CMC with the 0.75 bore. There was a slight
difference in movement at the slave pushrod along with slightly increased
pedal effort. 7% seems about right although I don't know enough about
hydraulics to say the difference in bore linearly equates to the overall
displacement and pedal effort but it seems logical. 7% doesn't sound like
much difference but with the close tolerances of our clutch systems every
little bit helps. I also welded and redrilled both holes for the clevis pin
so I get smooth shifts with 3/4 pedal movement. The extra pedal effort isn't
really noticeable to me anymore.
As for sources, Irv is correct in that the TR4 MC won't work. Along with
the 250 and 69 to early 70 TR6s, other LBCs apparently use similar looking
ones but I have noticed ones where the pipe connection is perpendicular to
the bore as opposed to the stock 45 deg angle but you can always bend a
line. I found an exact fit on eBay from a racer guy having nothing to do
with LBCs so there are apparently other applications as well. The casting on
mine says Girling BS3. I left the plastic cap as it looks better next to the
brake MC plastic cap IMO.
All said, I wouldn't do the swap again unless doing all the other
mention repairs to the system still leaves your clutch action on the edge
but I needed a new MC anyway and the research is part of the fun. Now
researching the 4 piston Toyota caliper brake upgrade. I wonder if the
difference in caliper displacement will make for longer pedal travel and
softer pedal. I should have paid less attention to the women and more
attention to my fluid dynamics professor.
Russ Pagano
71 TR6
>>- -----Original Message-----
>>From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
>>Behalf Of Steve Cirimele
>>Sent: Tuesday, September 02, 2003 3:07 PM
>>To: 6pack@autox.team.net
>>Subject: .75" clutch master in an early TR6?
>>
>>Hey there Listers,
>>I'm thinking of purchasing a new Clutch Master Cylinder to help overcome
the infamous "difficulty of clutch disengagement" problem. The holes are
out of round >>on both my clutch pedal and also on the actuating arm of the
clutch master cylinder. ...
/// 6pack@autox.team.net mailing list
/// or try http://www.team.net/cgi-bin/majorcool
/// Archives at http://www.team.net/archive
|