Club Cobra Keith Craft Motorsports  

Go Back   Club Cobra > Club Forums > Bay Area Cobra Club

MMG Superformance
Nevada Classics
MMG Superformance
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
MMG Superformance
Advertise at CC
Banner Ad Rates
Keith Craft Racing
MMG Superformance
MMG Superformance
MMG Superformance
March 2024
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            

Kirkham Motorsports

Like Tree1Likes

Reply
 
LinkBack Thread Tools Display Modes
  #1 (permalink)  
Old 05-28-2014, 08:59 PM
wanab5150's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2008
Location: Ocean Isle Beach, NC
Cobra Make, Engine: Superformance #2769 Roush 427R Dart Block
Posts: 606
Not Ranked     
Default Superformance clutch slave

We just did the Moro Bay trip in the Cobra last weekend. Right at 800 miles for us since we live in Roseville.

The car has been parked all week until tonight we went to dinner / car show in Folsom. On the way over I told Deb the clutch felt spongy. When we got there the slave reservoir to the clutch had only about an eighth inch of fluid and a pool on the ground. We matched our speed to the signal lights so as not to use the clutch......Once home the only fluid left was what was in the line and on the driveway.

THANK YOU LITTLE COBRA FOR MAKING THE 800 MILE TREK LAST WEEKEND AND WAITING TO BE HOME TO BREAK!

This may have something to do with Scott (Scooter)and Danette tampering with my car in Moro Bay...I have photographic proof!

Now, anyone know what slave this is.....or a replacement? I would also like a real pushrod to replace the one I made 8 years ago????? tom
__________________
Tom
I miss my Tazer
Reply With Quote
  #2 (permalink)  
Old 05-28-2014, 09:14 PM
mr. G's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2012
Location: san jose, ca
Cobra Make, Engine: SPO3041 427R
Posts: 36
Not Ranked     
Default

yo wanab5150
here's the part number that was installed in my car #3041 from summit racing #BCK-072-9514 it's a generic slave, problem was from misalignment turned the bore of the slave into an egg shape….
__________________
David
Reply With Quote
  #3 (permalink)  
Old 05-29-2014, 03:18 AM
CC Member
Visit my Photo Gallery

 
Join Date: Jul 2010
Location: McMurray, PA
Cobra Make, Engine: Superformance #522
Posts: 528
Not Ranked     
Default

Clutch slave choice is by the builder. For my car, 96-98 Suziki Samari
Reply With Quote
  #4 (permalink)  
Old 05-29-2014, 04:31 AM
Senile Club Cobra Member
Visit my Photo Gallery

 
Join Date: Feb 2001
Location: Buffalo, NY USA, NY
Cobra Make, Engine: Time Machines Motorsports LLC- Superformance Dealer
Posts: 4,482
Not Ranked     
Default

What engine/trans/bellhousing do you have? As said, the slave is the choice of the installer. SCOF has pictures of of some of the most common units used.

Without a picture of your we would just be shooting in the dark.
__________________
"I'm high all right, but on the real thing....powerful gasoline and a clean windshield..."

http://www.timemachinesauto.com/
Reply With Quote
  #5 (permalink)  
Old 05-29-2014, 09:58 PM
wanab5150's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2008
Location: Ocean Isle Beach, NC
Cobra Make, Engine: Superformance #2769 Roush 427R Dart Block
Posts: 606
Not Ranked     
Default

After researching everyone else's part numbers it's clear Superformance uses what ever slave in on the menu of the day. After several tours on the internet I stumbled across a Duralast slave part# 12413 that was a match. On Rock Auto 's website they had the same slave listed as being produced by 8 different manufactures. They all cross referenced each other and the slave is a generic to be used on whatever vehicle you think it will fit.

I found mine on line at Auto Zone for a whopping $14.99 with a non adjustable clutch rod. I do not understand the non-adjustable clutch rod?????? I put the slave back on with the 6 shims that space the slave back from the mount as it was when I removed it. Before I ran a double nut back and forth to adjust the clutch....now I'm thinking I just got lucky. It is buttery smooth and perfectly adjusted. I'm thinking that if it needs adjustment in the future I just have to either add shims or remove shims to the slave. Does this make any sense to anyone else. Everyone I've talked to has an adjustable rod that they made from a grade 8 bolt like I had before this. Hmmmmmmmmm !
__________________
Tom
I miss my Tazer
Reply With Quote
  #6 (permalink)  
Old 05-30-2014, 03:20 AM
Senile Club Cobra Member
Visit my Photo Gallery

 
Join Date: Feb 2001
Location: Buffalo, NY USA, NY
Cobra Make, Engine: Time Machines Motorsports LLC- Superformance Dealer
Posts: 4,482
Not Ranked     
Default

Quote:
Originally Posted by wanab5150 View Post
After researching everyone else's part numbers it's clear Superformance uses what ever slave in on the menu of the day.
Remember it is not "Superformance" but the installer or owner who selected the slave. And because the slave cylinders are typically from a production vehicle they don't have an adjustable pushrod......do you think GM etc. do a "how does it feel now" adjustment on the assembly line?
CWizard likes this.
__________________
"I'm high all right, but on the real thing....powerful gasoline and a clean windshield..."

http://www.timemachinesauto.com/
Reply With Quote
  #7 (permalink)  
Old 06-01-2014, 04:33 PM
wanab5150's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2008
Location: Ocean Isle Beach, NC
Cobra Make, Engine: Superformance #2769 Roush 427R Dart Block
Posts: 606
Not Ranked     
Red face

Smart Ass.......
I would have eventually figured it out, but it may have been next September at 3am that it would have popped into my head.
__________________
Tom
I miss my Tazer
Reply With Quote
  #8 (permalink)  
Old 10-26-2020, 07:27 AM
CC Member
Visit my Photo Gallery

 
Join Date: May 2017
Cobra Make, Engine: 351 Superformance #1968
Posts: 7
Not Ranked     
Default

Has anyone used a concentric slave setup on their Cobra? It looks like a viable solution to the asymmetric loading of the slave cylinder push rod. I have been through 3 slaves on my Superformance Mk3 and am curious as to whether a concentric slave is the answer to the asymmetric loading.
Reply With Quote
  #9 (permalink)  
Old 10-26-2020, 03:03 PM
DanEC's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2009
Location: Little Rock area, AR
Cobra Make, Engine: ERA Street Roadster #782 with 459 cu in FE KC engine, toploader, 3.31
Posts: 4,480
Not Ranked     
Default

Do you have an example of one? I’m not familiar with it.

Edit - never mind, I guess you’re looking at internal slave cylinders. I had external on my mind.
__________________
ERA 782 Running
https://www.youtube.com/watch?v=Cfge...b1-77fqwFRu7c]

Last edited by DanEC; 10-26-2020 at 03:06 PM..
Reply With Quote
  #10 (permalink)  
Old 10-27-2020, 06:01 AM
Sawdust's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Jun 2010
Location: North of Toronto, Ont
Cobra Make, Engine: Superformance #1950, Roush 402R, TKO600
Posts: 552
Not Ranked     
Default

For what it's worth I used a slave cylinder from Napa. Part #73168
Reply With Quote
  #11 (permalink)  
Old 10-27-2020, 06:38 AM
Senile Club Cobra Member
Visit my Photo Gallery

 
Join Date: Feb 2001
Location: Buffalo, NY USA, NY
Cobra Make, Engine: Time Machines Motorsports LLC- Superformance Dealer
Posts: 4,482
Not Ranked     
Default

We tend to not like HTOB on these cars. When they fail (and they will...) you must pull the engine or perform some fun contortionist moves to replace. A properly aligned push/pull slave will perform well for years. You do need to change the fluid every few years as it absorbs moisture and the location close to heat sources degrades the fluid. https://www.facebook.com/TimeMachine...type=3&theater

https://www.facebook.com/TimeMachine...type=3&theater
__________________
"I'm high all right, but on the real thing....powerful gasoline and a clean windshield..."

http://www.timemachinesauto.com/

Last edited by Mark IV; 10-27-2020 at 06:38 AM.. Reason: added
Reply With Quote
  #12 (permalink)  
Old 10-27-2020, 08:38 AM
CC Member
Visit my Photo Gallery

 
Join Date: May 2017
Cobra Make, Engine: 351 Superformance #1968
Posts: 7
Not Ranked     
Default

https://duckduckgo.com/?q=diagram+of....jpg&ia=images
It rides on the input shaft of the transmission; eliminates clutch fork.
Reply With Quote
  #13 (permalink)  
Old 10-27-2020, 09:35 AM
CC Member
Visit my Photo Gallery

 
Join Date: May 2017
Cobra Make, Engine: 351 Superformance #1968
Posts: 7
Not Ranked     
Default

Quote:
Originally Posted by mark iv View Post
we tend to not like htob on these cars. When they fail (and they will...) you must pull the engine or perform some fun contortionist moves to replace. A properly aligned push/pull slave will perform well for years. You do need to change the fluid every few years as it absorbs moisture and the location close to heat sources degrades the fluid. https://www.facebook.com/timemachine...type=3&theater

https://www.facebook.com/timemachine...type=3&theater
htob ?
Reply With Quote
  #14 (permalink)  
Old 10-27-2020, 11:13 AM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,628
Not Ranked     
Default

Something you want to keep in mind as you do your slave selection and replacement is slave cylinder diameter. Your SPF very likely uses a 0.875" clutch master cylinder like mine. Your slave ought to be a minimum of 0.875" or better yet 1". The slave I used in my car is 1.0625".

When you go to a 0.750" slave from a 1" slave you pedal pressure required to depress the clutch will increase. Here is the impact of changing slave cylinder diameter on pedal pressure. The model uses a 0.875" diameter slave and master as 1.0
  • A 0.750" diameter slave will increase felt pedal pressure by 36%
  • A 1.000" slave will decrease felt pedal pressure by 23%
  • A 1.0625" slave will decrease felt pedal pressure by 32%

To put this in perspective;
  • If you had a clutch with a 2400 lb plate, a 0.750" slave cylinder would produce a 36% increase in felt pedal pressure and is what you might expect to experience if you put in a clutch with a 3200# plate load. If you have never driven a car with one of these clutches, they give you cramps in your left leg and cause it to tremble uncontrollably in stop and go traffic.
  • If you had the same clutch with a 0.875" slave cylinder your clutch would feel like a heavy duty but tolerable clutch for many but not all drivers.
  • If you had the same clutch with a 1.00" slave cylinder it would feel like a light pedal in a showroom stock automobile and be possible for mere mortals to drive.
  • If you had the same clutch with a 1.0625" slave cylinder it would feel like a clutch in some proletariat euro import and be drivable by anyone (read your wife).

Choose wisely ...


Ed
__________________


Help them do what they would have done if they had known what they could do.
Reply With Quote
  #15 (permalink)  
Old 10-27-2020, 11:13 AM
CC Member
Visit my Photo Gallery

 
Join Date: May 2020
Cobra Make, Engine:
Posts: 78
Not Ranked     
Default

Quote:
Originally Posted by sn8ke2 View Post
htob ?
Hydraulic Throw-Out Bearing
Reply With Quote
  #16 (permalink)  
Old 10-27-2020, 11:38 AM
twobjshelbys's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Jan 2009
Location: Las Vegas, NV
Cobra Make, Engine: Shelby CSX4005LA, Roush 427IR
Posts: 5,450
Not Ranked     
Default

HTOBs seem problematic. When I had my car I had clutch issues and they all revolved about the HTOB being misaligned and thus eating the rubber seals. It was practically impossible to fix and I finally gave up and went to the practical and cheaper external slave and never had a problem after. After some research here I found Mike Forte's kit. I never regretted the change.


"proletariat". You're aging yourself by using that word. It's probably not even in the history book vocabulary now.
__________________
Cheers,
Tony
CSX4005LA
Reply With Quote
  #17 (permalink)  
Old 10-27-2020, 01:31 PM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,628
Not Ranked     
Default

Quote:
Originally Posted by twobjshelbys View Post
... "proletariat". You're aging yourself by using that word. It's probably not even in the history book vocabulary now.
I'm already older than dirt Tony, but you're right. Seems like old habits die hard


Ed
__________________


Help them do what they would have done if they had known what they could do.
Reply With Quote
  #18 (permalink)  
Old 10-28-2020, 02:35 PM
CC Member
Visit my Photo Gallery

 
Join Date: May 2017
Cobra Make, Engine: 351 Superformance #1968
Posts: 7
Not Ranked     
Default

Quote:
Originally Posted by eschaider View Post
Something you want to keep in mind as you do your slave selection and replacement is slave cylinder diameter. Your SPF very likely uses a 0.875" clutch master cylinder like mine. Your slave ought to be a minimum of 0.875" or better yet 1". The slave I used in my car is 1.0625".

When you go to a 0.750" slave from a 1" slave you pedal pressure required to depress the clutch will increase. Here is the impact of changing slave cylinder diameter on pedal pressure. The model uses a 0.875" diameter slave and master as 1.0
  • A 0.750" diameter slave will increase felt pedal pressure by 36%
  • A 1.000" slave will decrease felt pedal pressure by 23%
  • A 1.0625" slave will decrease felt pedal pressure by 32%

To put this in perspective;
  • If you had a clutch with a 2400 lb plate, a 0.750" slave cylinder would produce a 36% increase in felt pedal pressure and is what you might expect to experience if you put in a clutch with a 3200# plate load. If you have never driven a car with one of these clutches, they give you cramps in your left leg and cause it to tremble uncontrollably in stop and go traffic.
  • If you had the same clutch with a 0.875" slave cylinder your clutch would feel like a heavy duty but tolerable clutch for many but not all drivers.
  • If you had the same clutch with a 1.00" slave cylinder it would feel like a light pedal in a showroom stock automobile and be possible for mere mortals to drive.
  • If you had the same clutch with a 1.0625" slave cylinder it would feel like a clutch in some proletariat euro import and be drivable by anyone (read your wife).

Choose wisely ...


Ed
Thanks for your reply. Seems like a logical explanation; do you know of any 1.00" units on the market?
Reply With Quote
  #19 (permalink)  
Old 10-28-2020, 04:12 PM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4V ModMotor
Posts: 2,628
Not Ranked     
Default

Quote:
Originally Posted by sn8ke2 View Post
Thanks for your reply. Seems like a logical explanation; do you know of any 1.00" units on the market?

Here are a few 1" bore Dormans I dug up a while ago;

CS19097, CS33723, CS36170.

Get a Dorman catalog or go to Summit and check out the listings there.



Ed
__________________


Help them do what they would have done if they had known what they could do.

Last edited by eschaider; 10-29-2020 at 11:09 AM.. Reason: Spelling & Grammar
Reply With Quote
  #20 (permalink)  
Old 10-28-2020, 09:08 PM
saki302's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Jul 2009
Location: Los Angeles, CA
Cobra Make, Engine: Superformance Mk3, Roush 427
Posts: 229
Not Ranked     
Default

Forte recommended the .750 slave on my superformance.

I like it. But my friends call it a 'one driver car' for some reason ��

-Dave
__________________
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 Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 06:47 AM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2024, 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
Links monetized by VigLink