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 23Likes
04-07-2018, 08:58 AM
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CC Member
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Join Date: May 2007
Cobra Make, Engine: JCF supplied the body,frame,and some of the driveline-I completed it to be a very accurate 289 slabside
Posts: 149
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Not Ranked
Quote:
Originally Posted by FWB
ah, i see your trying to turn this post into something of substance.....shame on you
BTW its 7075 then 7050 and 7075 is also avail in T0 which isn't stronger than 6061-T6
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Yes, I agree. I didn't want to get too technical but maybe I should have explained that the final strength requires the right alloy and heat treatment. I have some 7075 T0 1/4" sheet. This can be bent and formed and then heat treated to make a very strong part. The big disadvantage with 7075 though is that it is not weldable, or at least is very difficult to weld, while 2024 welds nicely. 7075 is also heavier (denser) than the others. |
04-07-2018, 09:01 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by jon@harrison.ne
... (denser) than the others.
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Well, if you are looking for "denser than others" then you've come to the right forum.  |
04-07-2018, 01:19 PM
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Full Blown Member
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Join Date: Sep 2008
Cobra Make, Engine: KMP 427 S/C, Twin Paxton 511 FE
Posts: 2,594
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Not Ranked
Pat,
When are you installing the cruise control?
__________________
rodneym
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04-07-2018, 01:30 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by rodneym
Pat,
When are you installing the cruise control?
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Naaah, you know I'm old school. But, do you know what the typical ERA/KMS/CSX torque value is on a well-smacked spinner?  There have been a couple of threads on that, including the gt40 forums, and some not-dense guys have opined on it as well, but I'll just throw that out to see if the peanut gallery has any thoughts on it.... 
Last edited by patrickt; 04-07-2018 at 02:36 PM..
Reason: Uhh, maybe 400-600 ft/lbs? http://www.gt40s.com/forum/gt40-tech-chassis-brakes-tires-wheels/46933-spinner-torque-value.html
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04-07-2018, 05:17 PM
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CC Member
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Join Date: Apr 2016
Location: Phoenix,
AZ
Cobra Make, Engine: Ex owner of a polished Kirkham 427 S/C. Now Cobra-less and driving a mid-engine German hot rod.
Posts: 828
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Not Ranked
I get a lower number. Just estimating things here but came up with the following:
6 lb lead hammer = 2.72 kg
Moving at 11 m/s (about 25 mph)
Decel time hitting spinner = 0.01 sec (10 msec). Just a guess here
Decel therefore equals 1100 m/second squared
Force = just under 3000 Newton’s = 674 lbF
Spinner radius of about 6 inches means a torque of 335 lb-ft
Mike.
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04-07-2018, 05:37 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
The reason I crafted this little gizmo was really pretty simple. I picked up a new set of brake pads over the Christmas holidays and it took me a good 20 minutes to get the damn front spinners off. Only three minutes to pull the cotter pins out of my calipers and replace the pads, but then I had to whack the spinners back on. My elbow hurt for three days.  That's when Ellie, my dog, suggested crafting that tool. My dog is a genius. Fred and Red just don't want to admit that they really want one too, but that's ok -- we still love them.
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04-07-2018, 05:38 PM
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Senile Club Cobra Member
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Join Date: Feb 2001
Location: Buffalo, NY USA,
NY
Cobra Make, Engine: Superformance
Posts: 4,566
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Not Ranked
https://youtu.be/X8kCWG3d1Cc
Watch and learn.............
__________________
"I'm high all right, but on the real thing....powerful gasoline and a clean windshield..."
rick@autoventureusa.net
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04-07-2018, 05:45 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by Mark IV
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Yeah, but that's crappy SPF stuff. |
04-10-2018, 06:15 AM
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CC Member
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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: 4,533
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Not Ranked
Quote:
Originally Posted by Mark IV
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My thoughts after watching this video - I must be putting entirely too much effort into tightening the spinners on my ERA and 66 Vette. Even with a 6 lb hammer I use both hands and use pretty short but hard licks. |
04-08-2018, 07:56 AM
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CC Member
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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: 4,533
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Not Ranked
I know the factory engineering torque spec for Corvette KO wheel is 450 ft-lbs. But I think their threaded hub may be a bit larger diameter than the Cobra - haven't compared. Has anyone ever found an old Halibrand torque spec or a torque spec from one of the current Cobra KO wheel manufactures?
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04-08-2018, 08:08 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by DanEC
I know the factory engineering torque spec for Corvette KO wheel is 450 ft-lbs. But I think their threaded hub may be a bit larger diameter than the Cobra - haven't compared. Has anyone ever found an old Halibrand torque spec or a torque spec from one of the current Cobra KO wheel manufactures?
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We have enough mechanical and structural engineers on here that we should be able to get an answer on that. And on what the safe load is on an aluminum T6 hex bar that is one and one half inches across the flats. So far it's barely even scratched, much less showing any twisting. |
04-08-2018, 09:52 AM
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CC Member
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Join Date: Dec 2003
Location: Gurnee,
IL
Cobra Make, Engine: Kirkham #259
Posts: 1,396
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Not Ranked
Patrick
We use a 2.75” socket on our SS nuts ....torqued to 450# lbs. of torque to put them on......
And if we remove them with the torque wrench .....it takes over 600# of torque to take them off.....with the 3/4” impact and a 1/2” hose it knocks them right off....
Yes we use the impact to put them on as well.....
BTW......the 2.75” Socket is standard size for the Center-lock wheels used in TransAm and IMSA....
__________________
Morris
Last edited by Morris; 04-08-2018 at 09:55 AM..
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04-08-2018, 10:16 AM
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CC Member
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Join Date: Aug 2014
Cobra Make, Engine: Scratch Built with 482 FE
Posts: 146
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Not Ranked
Quote:
Originally Posted by Morris
Patrick
We use a 2.75” socket on our SS nuts ....torqued to 450# lbs. of torque to put them on......
And if we remove them with the torque wrench .....it takes over 600# of torque to take them off.....with the 3/4” impact and a 1/2” hose it knocks them right off....
Yes we use the impact to put them on as well.....
BTW......the 2.75” Socket is standard size for the Center-lock wheels used in TransAm and IMSA....
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Hi Morris,
Where did you get the SS nuts? I would like to get a set.
Thanks,
SB |
04-08-2018, 03:35 PM
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CC Member
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Join Date: Dec 2003
Location: Gurnee,
IL
Cobra Make, Engine: Kirkham #259
Posts: 1,396
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Not Ranked
Quote:
Originally Posted by ScratchBuilder
Hi Morris,
Where did you get the SS nuts? I would like to get a set.
Thanks,
SB
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I can’t remember the guy’s name.....but he is in Torrance CA. And made a lot of parts for the fellow that builds and refurbishes Cobra’s at the Torrance Airport....
Mike something.....very well known....that’s all I can remember......but the cost back then was $100.00 per nut....stainless-steel.....and they fit our wheels perfect.....meaning the angle of the mating surface.....
Hope that helps....
__________________
Morris
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04-08-2018, 04:14 PM
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CC Member
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Join Date: Aug 2017
Location: Maryville,
TN
Cobra Make, Engine: '65 Shelby Cobra, '66 Shelby GT350's
Posts: 279
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Not Ranked
Quote:
Originally Posted by Morris
I can’t remember the guy’s name.....but he is in Torrance CA. And made a lot of parts for the fellow that builds and refurbishes Cobra’s at the Torrance Airport....
Mike something.....very well known....that’s all I can remember......but the cost back then was $100.00 per nut....stainless-steel.....and they fit our wheels perfect.....meaning the angle of the mating surface.....
Hope that helps....
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I think you are referring to Mike McCluskey of McCluskey LTD.
__________________
~ Steven
6S1806, 1966 Shelby GT350 B/P Race car.
6S246, Shelby GT350 "carryover"
6S1745 Shelby GT350
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04-09-2018, 10:06 AM
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Full Blown Member
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Join Date: Sep 2008
Cobra Make, Engine: KMP 427 S/C, Twin Paxton 511 FE
Posts: 2,594
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Not Ranked
Quote:
Originally Posted by Morris
I can’t remember the guy’s name.....but he is in Torrance CA. And made a lot of parts for the fellow that builds and refurbishes Cobra’s at the Torrance Airport....
Mike something.....
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Mike McCluskey is of course the restorer at Zamperini Field but I believe you're talking about George Petrus of cobraracing.com. He has since passed away and his son has "taken over". I've been to his new shop (his son is a machinist too) and even purchased parts but communication is spotty.
If I'm not mistaken, the nuts from Vintage are ally and the ones from Cobra Racing are SS.
Zoomed View
__________________
rodneym
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04-09-2018, 10:15 AM
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CC Member
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Join Date: Dec 2003
Location: Gurnee,
IL
Cobra Make, Engine: Kirkham #259
Posts: 1,396
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Not Ranked
Quote:
Originally Posted by rodneym
Mike McCluskey is of course the restorer at Zamperini Field but I believe you're talking about George Petrus of cobraracing.com. He has since passed away and his son has "taken over". I've been to his new shop (his son is a machinist too) and even purchased parts but communication is spotty.
If I'm not mistaken, the nuts from Vintage are ally and the ones from Cobra Racing are SS.
Zoomed View |
Thank You.....sometimes it takes a few turns for my brain to catch my mouth....
__________________
Morris
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04-08-2018, 10:22 AM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by Morris
Patrick
We use a 2.75” socket on our SS nuts ....torqued to 450# lbs. of torque to put them on......
And if we remove them with the torque wrench .....it takes over 600# of torque to take them off.....with the 3/4” impact and a 1/2” hose it knocks them right off....
Yes we use the impact to put them on as well.....
BTW......the 2.75” Socket is standard size for the Center-lock wheels used in TransAm and IMSA....
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I like a definitive and authoritative answer. Thanks. |
04-11-2018, 01:49 PM
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CC Member
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Join Date: Apr 2007
Cobra Make, Engine:
Posts: 1,009
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Not Ranked
Center lock Torque
Quote:
Originally Posted by Morris
Patrick
We use a 2.75” socket on our SS nuts ....torqued to 450# lbs. of torque to put them on......
And if we remove them with the torque wrench .....it takes over 600# of torque to take them off.....with the 3/4” impact and a 1/2” hose it knocks them right off....
Yes we use the impact to put them on as well.....
BTW......the 2.75” Socket is standard size for the Center-lock wheels used in TransAm and IMSA....
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Porsche is 450 Ft/lb also, I bought a 4' torque wrench to install on my GT3 and it takes a 6' breaker bar to remove. I have given myself carpal tunnel in both hands banging on the knock offs so now I need to follow Morris lead and get SS nuts. I can no longer even swing my lead knock off hammer. |
04-11-2018, 04:38 PM
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Half-Ass Member
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Join Date: Jun 2005
Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum
Posts: 22,025
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Not Ranked
Quote:
Originally Posted by Cobra #3170
Porsche is 450 Ft/lb also, I bought a 4' torque wrench to install on my GT3 and it takes a 6' breaker bar to remove. I have given myself carpal tunnel in both hands banging on the knock offs so now I need to follow Morris lead and get SS nuts. I can no longer even swing my lead knock off hammer.
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Well I just put the half inch hose, and appropriate fittings, on the AirCat and tool and it did indeed make a nice difference.  . How much, I can't really tell. I still have no way to torque them down accurately with my gun and tool, and I can't find a torque stick that will fit my half inch gun, so I'll just keep whacking them with the Mutha Thumper hammer to put them on and use my tool to remove them.
Last edited by patrickt; 04-11-2018 at 04:40 PM..
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