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 8Likes
02-29-2016, 02:18 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
Door Sill Plates
Did the originals have them? I bought a shrinker/stretcher tool from Woodward with the hopes of fabricating a set. I tried 5052 and 6061 in .040 thickness with the sides at 1.00 inch wide and .50 inch wide. All four attempts resulted in the stretched section breaking.
Does anyone make them to fit the 289 FIA door shape or should I pursue a different solution for the edge?
Thanks
Bill
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02-29-2016, 02:42 PM
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CC Member
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Join Date: May 2013
Cobra Make, Engine: SPF 289 Street
Posts: 209
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Not Ranked
You need softer, un-heat treated aluminum. 6061 cracks when bent, stretched.
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02-29-2016, 02:43 PM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,391
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I'm not a Smith by anyone's imagination but I'd say the aluminum would most likely need to be annealed before stretching. Google it and you'll see more about the process.
Larry
__________________
Alba gu brąth
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02-29-2016, 02:55 PM
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Club Cobra Member
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Join Date: Nov 2000
Location: Macedonia,
OH
Cobra Make, Engine: A&C 427S/C, 351W, T5
Posts: 513
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Not Ranked
I bought angled aluminum from either Home Depot or Lowes and made my door sills.
I used a bit of heat on the bend drilled and csink the holes. Looks great.
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02-29-2016, 03:06 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
Pnjsnak-
Thanks for the alternative. Do you have pics?
Bill
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02-29-2016, 03:09 PM
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CC Member
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Join Date: Oct 2003
Location: Queen Creek,
AZ
Cobra Make, Engine: Midstates, Vette suspension, Baer 6P brakes, 540 cid Chevy, Haltech Fuel Injection
Posts: 906
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Not Ranked
I recommend 5052 aluminum for forming. 2024 will also work.
__________________
E. Wood
ItBites
10.69 @ 129.83mph - on pump gas and street tires
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02-29-2016, 03:14 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
I tried 5052. It broke also
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02-29-2016, 04:54 PM
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CC Member
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Join Date: Jun 2001
Location: Mesa,
AZ
Cobra Make, Engine: ERA #2119 289FIA
Posts: 5,380
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Not Ranked
Itbites, Good to see you are still depleting our oxygen. Please drop me an eMail, kbebout@yahoo.com
Karlos
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Karlos
"In the Land of the Pigs, The Butcher is King"
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02-29-2016, 07:54 PM
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Club Cobra Member
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Join Date: Nov 2000
Location: Macedonia,
OH
Cobra Make, Engine: A&C 427S/C, 351W, T5
Posts: 513
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Not Ranked
No pics available she is undercover sleeping the winter off.
Just check out the aluminum stock at Lowes or Home Depot
The 1 x 1/2 stock is 36" lg
Put a flame to it and it becomes pretty maluable and easy to form the radius at each end
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02-29-2016, 08:30 PM
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CC Member
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Join Date: Feb 2003
Location: Plymouth,
MA
Cobra Make, Engine: MidStates, 351C, 4spd, 9"
Posts: 400
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Not Ranked
Hi Bill,
The bodies are made from 3000 series ally. Very soft and formable. I wouldn't doubt that the trim plates may have been too.
Good Luck,
Mike.
__________________
"It's not about getting from point A to point B. It is the point"
-J. James
M. Krause
1.508.944.3368
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03-01-2016, 11:36 AM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 19,029
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Not Ranked
Comp cars did not have sill plates that I know of.
However on my old car I too used the flat alloy stock from Ace Hardware, same as Lowes, it bends and conforms nicely.
All for about $6, rivets extra.....
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03-01-2016, 12:11 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
85CCX-
I've been bending bending section 36" x 2" into 1" x 1" 90 degree sections, then stretching one side so as to follow the contour of the door and protect the edge. When I try to make the sharp radius in the front, the stretched part cracks. I take a picture and post. If it's just a flat piece, I wouldn't have any problems
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03-01-2016, 12:15 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
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03-01-2016, 01:49 PM
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CC Member
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Join Date: Feb 2003
Location: Plymouth,
MA
Cobra Make, Engine: MidStates, 351C, 4spd, 9"
Posts: 400
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Not Ranked
Looks like you're using some very thin stuff. Thicker material should give you a little more stretch before it splits.
MK.
__________________
"It's not about getting from point A to point B. It is the point"
-J. James
M. Krause
1.508.944.3368
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03-01-2016, 05:07 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 19,029
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Not Ranked
Awesome job!
Looks like you on track.
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03-17-2016, 06:40 PM
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CC Member
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Join Date: Jul 2006
Location: Redding,
CA
Cobra Make, Engine: FFR chassis and suspension, Mr. Bruce 289 FIA body
Posts: 1,066
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Not Ranked
I successfully made two sills today. Many thanks to everyone that provided excellent feedback and suggestions. I used .040 3003-H14 aluminum, 2" x 36". I made a lip 1/2 wide and proceeded to stretch and shrink to fit a buck I made from the contour of the body. I cut a piece of the carpeting that came with the kit (I won't be using it anyway) to check gap between the lip of the sill and carpeting. Body needs some trimming. Easy stuff
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03-17-2016, 07:07 PM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,391
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Not Ranked
Nice job!
Larry
__________________
Alba gu brąth
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03-17-2016, 07:10 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Manchester,
NH
Cobra Make, Engine: AK1085 (302 Street), HTM111 (427 Comp), CSX2375R (289 Comp) and COB5999 (427 S/C)
Posts: 19,029
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Not Ranked
Fabulous!
Great work, proud of you.
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03-17-2016, 07:31 PM
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CC Member
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Join Date: Jul 2009
Location: Kingston,
NY
Cobra Make, Engine: Contemporary 302 Ford stroked to 347
Posts: 57
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Not Ranked
Great job
Ed
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03-18-2016, 01:14 AM
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CC Member
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Join Date: Feb 2006
Location: Gore. New Zealand.,
SI
Cobra Make, Engine: DIY Coupe, F/T ,MkIV.
Posts: 808
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Not Ranked
Bill , it looks like your using the grooved jaws that came with your shrinker/stretcher, there is an outfit in the USA somewhere that remove the grooves and apply a 'stippled' finish for use on alloy, does not mark the alloy as much and therefore eliminates the tendency for the alloy to crack on the grooves.... gitzit or something like that...
__________________
Jac Mac
Last edited by Jac Mac; 03-18-2016 at 01:17 AM..
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