SUPPORT OUR SPONSOR

Go Back   Club Cobra > Club Cobra Tech Areas > Shop Talk

Welcome to Club Cobra!  The World's largest non biased Shelby Cobra related site!

  •  » Representation from nearly all Cobra/Daytona/GT40 manufacturers
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and nearly 1 million posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

Midwest Classic Insurance
Nevada Classics
Shell Valley Companies
Main Menu
Nevada Classics
Nevada Classics
Win With A Cobra
Advertise at CC
Banner Ad Rates
Trigo Wheels
Win With A Cobra
October 2014
S M T W T F S
      1 2 3 4
5 6 7 8 9 10 11
12 13 14 15 16 17 18
19 20 21 22 23 24 25
26 27 28 29 30 31  
  #1 (permalink)  
Old 09-13-2006, 05:21 PM
Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 2000
Location: Sunnyvale, ca
Cobra Make, Engine: Everett-Morrison,428SCJ
Posts: 354
Not Ranked     
Default Clutch Master /Slave Problem

Well, after 10 years it finally runs. Now if I could just get it drivable.....

I can't get enough stroke to disengage the clutch....I've got a 3/4" Wilwood compact master cylinder(the largest they build), and a late 50's stock Ford truck slave cylinder. The slave looks like it has a 1" bore. What I need is a 3/4" bore slave. I've got a lathe and I've been thinking that maybe I could sleeve it down to 3/4, but that would probably be a big waste of time since it would most likely leak like crazy.........

Does anyone know of a 3/4 inch bore PUSH style slave cylinder that can be adapted to work on a Cobra with an FE? ERA uses a BMW part, but it's "Special Order" at the local parts store, and I can't find any specs on it. I don't want another $100 paper weight!

Thanks,
Jon
Reply With Quote
Sponsored Links
Sponsored Links
  #2 (permalink)  
Old 09-13-2006, 06:06 PM
pgermond's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 2003
Location: Roseville, CA
Cobra Make, Engine: 427 Unique Roadster, Southern Automotive FE, Top Loader, 3:31 Jag
Posts: 1,352
Not Ranked     
Default

NAPA, part#33721, 1" bore, $55. I have the Wilwood 3/4" m/c mated with this slave.

http://www.napaonline.com/MasterPage...Slave+Cylinder
__________________
Phil

CA SPCN 2004-040 complete and legal

http://www.uniquecobra.com/
Reply With Quote
  #3 (permalink)  
Old 09-13-2006, 06:59 PM
Registered User
Visit my Photo Gallery

 
Join Date: Sep 2006
Location: Pittsburgh, PA
Cobra Make, Engine: Kirkham, 427 pond, twm 8 stack
Posts: 32
Not Ranked     
Default

Speedway motors has a 7/8" push style for $49.95, part #91025605. I used it with the Wilwood master.
http://www.speedwaymotors.com/xq/asp...qx/Product.htm
Reply With Quote
  #4 (permalink)  
Old 09-13-2006, 07:54 PM
Registered User
Visit my Photo Gallery

 
Join Date: Oct 2004
Location: Stacy, MN
Cobra Make, Engine: FFR 390FE
Posts: 32
Not Ranked     
Default

I have the same clutch slave as you 1" bore. I use to have a 7/8" master,but now just switch to a 1" willwood master with remote reservoir.It works very well. I have the wilwood 6 to 1 pedal ratio flour mount setup.
Reply With Quote
  #5 (permalink)  
Old 09-13-2006, 09:05 PM
Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 2000
Location: Sunnyvale, ca
Cobra Make, Engine: Everett-Morrison,428SCJ
Posts: 354
Not Ranked     
Default

Thanks Guys,
The only master that will work with my Super Custom Home Made Frame/Floor Mount Pedal Assembly is Wilwood's compact master which does not come any bigger than 3/4". I only get 1" travel at the master, and as I understand it, I need 1" travel at the slave to get things to work right. A quick check of the physics of things leads me to believe that I can only get this done with a 3/4", or smaller slave.

The 7/8" may work.....or I may end up with another high dollar paper wieght.

I can bump up the travel at the master to a max of 1.44", but that would not be much fun.....Think lots of cutting and welding followed by much brake bleeding.

Thanks,
Jon
Reply With Quote
  #6 (permalink)  
Old 09-13-2006, 09:47 PM
Registered User
Visit my Photo Gallery

 
Join Date: Oct 2004
Location: Stacy, MN
Cobra Make, Engine: FFR 390FE
Posts: 32
Not Ranked     
Default

With the 7/8" master I had barely moved the slave fare enough to relase the clutch. The 1" master is the one you want. Wilwood part#260-3378 this one comes in a kit with the resivors. It will bolt up the same as the master you already have.
I don't no if you no ,but the 1959 ford truck that uses the slave has 1-1/8" master.
Reply With Quote
  #7 (permalink)  
Old 09-14-2006, 07:47 AM
Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 2000
Location: Sunnyvale, ca
Cobra Make, Engine: Everett-Morrison,428SCJ
Posts: 354
Not Ranked     
Default

The Wilwood COMPACT master only goes up to 3/4". It's not the same as their REMOTE master, available in bigger bores, which is too long to fit in my car......

I could not get a good measurement on my slave, but if it is 1 1/8" then just maybe the 7/8" slave would work if I increase the stroke of the master(see "cutting and welding" above)....time for a little math.

Does anybody know what the bore of the BMW slave that ERA uses is?

Thanks!
Jon

Last edited by Jon Miller; 09-14-2006 at 07:50 AM..
Reply With Quote
  #8 (permalink)  
Old 09-14-2006, 08:53 AM
John Annie's Avatar
Registered User
Visit my Photo Gallery

 
Join Date: Jul 2002
Location: Charleston, WV
Cobra Make, Engine: ERA #661 with a 428CJ, Richmond 5 speed
Posts: 28
Not Ranked     
Default

Jon,
This may get you started as you'll probably have to contact a BMW parts department for additional information. But my ERA manual lists the following BMW part numbers:
Clutch master cyl.(Fits 72-76 2002)BMW 1252 1104 510 or Tilton 74-875 (special)

Clutch slave cylinder: BMW 21521104269

Hope this helps.

The more I get into building my car the more impressed I am with ERA and the excellent job they've done with the car and their manual. Thanks Bob!!

John Annie
Reply With Quote
  #9 (permalink)  
Old 09-14-2006, 12:24 PM
Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 2000
Location: Sunnyvale, ca
Cobra Make, Engine: Everett-Morrison,428SCJ
Posts: 354
Not Ranked     
Default

The best single purchase I made during the construction of my Everett-Morrison was the manual from ERA....

Thanks,
Jon
Reply With Quote
  #10 (permalink)  
Old 09-14-2006, 01:24 PM
CC Member
Visit my Photo Gallery

 
Join Date: Jul 2002
Cobra Make, Engine: KMP329 w/KC489 Shelby
Posts: 392
Not Ranked     
Default

I had the same problem as you. I had my slave resleeved to .75" by White Post Restorations. They are expensive, but guarantee the slave for life. My set up works great, so I'm happy.
Reply With Quote
  #11 (permalink)  
Old 09-14-2006, 04:31 PM
pgermond's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 2003
Location: Roseville, CA
Cobra Make, Engine: 427 Unique Roadster, Southern Automotive FE, Top Loader, 3:31 Jag
Posts: 1,352
Not Ranked     
Default

Quote:
Originally Posted by Jon Miller
The best single purchase I made during the construction of my Everett-Morrison was the manual from ERA....

Thanks,
Jon
Yep, me too - when I built my Unique.
__________________
Phil

CA SPCN 2004-040 complete and legal

http://www.uniquecobra.com/
Reply With Quote
  #12 (permalink)  
Old 09-14-2006, 05:46 PM
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jul 2003
Location: Santa Fe, NM
Cobra Make, Engine: Cardiac, 428 FE
Posts: 301
Not Ranked     
Default

Have you looked at Tilton? www.tiltonracing.com

I have their top hung setup and after finding that my Tilton Hydraulic T/O bearing needed replacing, I ended up also replacing the master cylinder so the two matched. The clutch works flawlessly now. I didn't think I would like the hyd. T/O but my mechanic has one in his racing stock car and has had zero problems with them leaking. They have many options for master/slave setups. Go to their website and poke around. Make sure the master matches what they recommend to go with the slave bore diameter you have. Their tech people are real helpful too.

Good luck.

Paul
Reply With Quote
  #13 (permalink)  
Old 09-14-2006, 06:34 PM
Club Cobra Member
Visit my Photo Gallery

 
Join Date: Jan 2000
Location: Sunnyvale, ca
Cobra Make, Engine: Everett-Morrison,428SCJ
Posts: 354
Not Ranked     
Default

Since I Realllly want to get this thing on the road, it will be ten years at the end of the month........I spent a half hour at the local parts store with a dial calipers in hand, and ended up with a Raybestos SC360018. My donor list has now expanded to include Mazda, 1993 MX-6 to be exact. I built a new bracket this afternoon, and if I can get a 10mm to AN4 adaptor locally I'll be driving the Cobra Friday after work!

Thanks for all of the help!!
Jon
Reply With Quote
  #14 (permalink)  
Old 09-14-2006, 08:13 PM
Registered User
Visit my Photo Gallery

 
Join Date: Mar 1999
Location: TACOMA, WA
Cobra Make, Engine: Everett Morrision FE 427 so 2-4s
Posts: 1,597
Not Ranked     
Default

My car had a 7/8" dia Tilton master cylinder and the slave cylinder travel was so limited that either I could get full release or some free travel. Once It took out my clutch forks when the throw out bearing failed. I converted to a 15/16" dia master Tilton cylinder , and it worked great. Just a little more volume and a little less leverage. full clutch release and free travel.
__________________
Mike H
Reply With Quote
  #15 (permalink)  
Old 08-04-2010, 06:53 PM
Registered User
Visit my Photo Gallery

 
Join Date: Aug 2010
Cobra Make, Engine:
Posts: 2
Not Ranked     
Default

I know that this forum thread has been old enough to be replied on, but I must say that reading this specific post about Clutch Kit change or master/slave problem was a good read. You must be able to really understood well the things that have been mentioned here and continue to really amaze on how things work. Great post indeed! Thanks for this one!
Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 08:10 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy