Club Cobra Gas-N Exhaust  

Go Back   Club Cobra > Cobra Talk Areas > Originality Forum

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

Nevada Classics
Planet Cobra
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
Keith Craft Racing
Keith Craft Racing
Advertise at CC
Banner Ad Rates
MMG Superformance
Planet Cobra
MMG Superformance
October 2019
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 Tree21Likes

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #61 (permalink)  
Old 07-11-2019, 11:06 AM
jolsen42's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2002
Location: Mooresville, NC
Cobra Make, Engine: Factory Five chassis/Mr. Bruce slabside
Posts: 468
Not Ranked     
Default

They hold the stops so the seats won't go off the sliders.

John O
__________________
jjo42
Reply With Quote
Sponsored Links
Sponsored Links
  #62 (permalink)  
Old 07-11-2019, 04:04 PM
LMH's Avatar
LMH LMH is offline
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2005
Location: Tucson, AZ
Cobra Make, Engine:
Posts: 5,038
Not Ranked     
Default

Yes, John is correct. It holds the limit on the primary slider keeping it from sliding too far.
Sorry, I would have answered earlier but I'm not receiving any notifications from CC.
Larry
__________________
Alba gu brąth
Reply With Quote
  #63 (permalink)  
Old 07-11-2019, 10:30 PM
ALF's Avatar
ALF ALF is offline
CC Member
Visit my Photo Gallery

 
Join Date: Sep 2003
Location: Switzerland, CH
Cobra Make, Engine:
Posts: 455
Not Ranked     
Default

Many thanks to both of you for clarifying this to me
__________________
Driving with your Cobra is fun,
Racing with your Cobra is amazing,
Driving hill-climbing races with your Cobra is.... HAVEN!!
Reply With Quote
  #64 (permalink)  
Old 07-12-2019, 02:00 AM
Gaz64's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: May 2008
Location: Brisbane, QLD
Cobra Make, Engine:
Posts: 2,249
Not Ranked     
Default

Looks like a limiting stop, to limit for and aft travel.
Gary
Reply With Quote
  #65 (permalink)  
Old 07-12-2019, 08:34 AM
CC Member
Visit my Photo Gallery
Original Shelby Owner


 
Join Date: Aug 2007
Cobra Make, Engine: 31XX Car
Posts: 374
Not Ranked     
Default tracks

Now a solution needs to be developed for preventing cracks in high horsepower cars at the rear of the lower track (the portion that bolts to the car) where has kind of a notch as it necks down to essentially a flat plate.

Last edited by DMXF; 07-12-2019 at 08:38 AM..
Reply With Quote
  #66 (permalink)  
Old 07-12-2019, 04:25 PM
LMH's Avatar
LMH LMH is offline
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2005
Location: Tucson, AZ
Cobra Make, Engine:
Posts: 5,038
Not Ranked     
Default

Sorry Mike, you're on your own for mods. We were trying to get as close as possible to original as they came from Chapman. Literally so exact that you couldn't tell the difference between an original and ours. It's what we shoot for with everything we've done.
Larry
__________________
Alba gu brąth
Reply With Quote
  #67 (permalink)  
Old 07-13-2019, 07:53 AM
CC Member
Visit my Photo Gallery
Original Shelby Owner


 
Join Date: Aug 2007
Cobra Make, Engine: 31XX Car
Posts: 374
Not Ranked     
Default

Quote:
Originally Posted by LMH View Post
Sorry Mike, you're on your own for mods. We were trying to get as close as possible to original as they came from Chapman. Literally so exact that you couldn't tell the difference between an original and ours. It's what we shoot for with everything we've done.
Larry
I agree any effort to make new ones should be focused on originality, but there is probably some add-on pieces that may help the problem. For example, a stiffener of some sort under the tracks may help, ideally combined with some secure way of retaining the lower track onto the stiffener, as I suspect a lifting/vertical force toward the back during braking may be a factor.
Reply With Quote
  #68 (permalink)  
Old 07-13-2019, 08:14 AM
LMH's Avatar
LMH LMH is offline
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2005
Location: Tucson, AZ
Cobra Make, Engine:
Posts: 5,038
Not Ranked     
Default

Quote:
Originally Posted by DMXF View Post
I agree any effort to make new ones should be focused on originality, but there is probably some add-on pieces that may help the problem. For example, a stiffener of some sort under the tracks may help, ideally combined with some secure way of retaining the lower track onto the stiffener, as I suspect a lifting/vertical force toward the back during braking may be a factor.
Is this an issue happening often to tracks on 427 Cobras? We had a couple sets for reference, one from a Cobra 427 but they weren't cracked or deformed, just rust and pitting. One thing we did see was the metal strip holding the rollers was bent, keeping the rollers from rolling.

Larry
__________________
Alba gu brąth
Reply With Quote
  #69 (permalink)  
Old 07-13-2019, 12:46 PM
CC Member
Visit my Photo Gallery
Original Shelby Owner


 
Join Date: Aug 2007
Cobra Make, Engine: 31XX Car
Posts: 374
Not Ranked     
Default cracks

I've personally seen or aware of around a dozen instances; and I'm not even in the business. Most people probably don't even know theirs are cracked. I bet someone like McCluskey must have seen hundreds...
Attached Images
 
Reply With Quote
  #70 (permalink)  
Old 07-13-2019, 04:21 PM
LMH's Avatar
LMH LMH is offline
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2005
Location: Tucson, AZ
Cobra Make, Engine:
Posts: 5,038
Not Ranked     
Default

Interesting! I can see why at that spot as it's the weakest place. Without thinking about it much, a strap could be welded around the track to strengthen it I suppose. It would take away from the originality of course but would be on the bottom.
Personally, I think the way to deal with it would be to throw away the 50 year old tracks and buy a new set!

Larry
__________________
Alba gu brąth
Reply With Quote
  #71 (permalink)  
Old 07-13-2019, 05:01 PM
CC Member
Visit my Photo Gallery

 
Join Date: May 2013
Cobra Make, Engine: SPF 289 Street
Posts: 174
Not Ranked     
Default

The OE tracks are made from period British Butter. If the lower track fasteners get loose, or were never tightened properly, movement will work harden.. then crack them. I suspect that’s 100% of the problem. If they are bolted down properly, nice and tight, no cracking.
It historically has been a PITA to properly tighten the lower tracks on both 289 & 427 cars. Many original owners half assed it. I have seen that in person.
Reply With Quote
  #72 (permalink)  
Old 07-13-2019, 06:08 PM
CC Member
Visit my Photo Gallery
Original Shelby Owner


 
Join Date: Aug 2007
Cobra Make, Engine: 31XX Car
Posts: 374
Not Ranked     
Default weakness

I will add to the speculation with a general observation that the design at that area is so poor that I suspect it will be hard to completely eliminate the cracking for the more extreme usage applications. Think of it as a cantilever beam where the fixed end where it meets the center thick part of the track has a geometric discontinuity with reduced bending stiffness (look at how you even lose the inward wrapping flange there). Changing the outboard end constraint (more rigidly tightened bolt) or even material strength will only have a marginal effect. I assume these tracks are not heat treated after forming, so there probably isn't that much difference in the material properties for them to be formable without cracking. Also, you can only get the bolts so tight, as I recall you're going through the carpeting and the original square tubing there crushes easily. The best that can probably be hoped for is incremental improvements across multiple attributes described that may add up to enough improvement to keep the problem at bay. The ultimate solution may be something like a stiffening plate that bolts under the track with flanges that wrap up on each side to dramatically increase bending stiffness, combined with some way to capture the upper corners of the track on each side. This way it could be removed for when cars need to be aesthetically correct like going through the auction block.
Reply With Quote
  #73 (permalink)  
Old 07-14-2019, 07:32 AM
CC Member
Visit my Photo Gallery

 
Join Date: May 2013
Cobra Make, Engine: SPF 289 Street
Posts: 174
Not Ranked     
Default

I guarantee I can fix the issue with a material change alone. But you couldn’t afford them when done. Then the conundrum of a design change. Then, why have a Cobra? Go buy a new Ford GT. No seat tracks to deal with.
jolsen42 likes this.
Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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 11:09 PM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2019, 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