Roll cage install - Chevelle Tech
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post #1 of 9 (permalink) Old Nov 19th, 13, 12:17 PM Thread Starter
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John
 
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Roll cage install

I ran across this helpful Car Craft article w/ pics on how to install a roll cage which I will be doing shortly. However, one thing I have read is that NHRA/IHRA requires the main hoop to pass thru the floor and be welded directly to the frame. This guy simply welds the hoop to plates that are welded directly to the floor. Is that "race legal" for a '68-'72 Chevelle?

http://www.carcraft.com/projectbuild...build_install/

Also, can I weld mine up properly using just flux core wire or do I need to go MIG? Thanks for any input guys and any additional advice is absolutely welcome.

John Austin
Katy, Texas
'70 SS454 Chevelle "clone" project
My combo:496 BBC (454 +.060), Muncie 4 spd, Centerforce dual fric clutch, "781" heads 2.19/1.88, 12-bolt 3.73 Eaton posi, Scat forged rot assm (21cc Wiseco slugs for 10.4:1 CR), Lunati Voodoo billet 60213 hyd roller, Lunati hyd roller lifters, Scorpion 1.7 #SCP1014 roller rockers, Edelbrock Performer RPM, Holly 850 Dbl Pmpr (1" spa), Carter 172 GPH mech fuel pump, MSD R2R dist. #8360, O'reilly Master Pro coil, Weiand high volume mech water pump, 772 stock 7 blade fan, Hayden clutch, fan shroud & Hi-flow 160 deg T-stat, Doug's 2" x 3 1/2" headers
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post #2 of 9 (permalink) Old Nov 19th, 13, 12:25 PM
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Re: Roll cage install

No it is not legal. All points should go to frame.

Ray


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post #3 of 9 (permalink) Old Nov 19th, 13, 12:43 PM
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Re: Roll cage install

Saw this article prior. What intrigues me is NHRA requirement. Body is secured to frame with rubber mounts, bolts and cage nuts. In event of a severe enough impact, I have seen cage nuts pull through body mount braces. If purpose of roll cage is roof collapse, would make more sense to isolate passenger compartment. IE, Camaro has requirement for steel reinforcement plates, while Chevelle they require attachment to frame, Never really understood this.

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post #4 of 9 (permalink) Old Nov 19th, 13, 1:01 PM
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Re: Roll cage install

That kit doesn't appear to even attach to the frame, so it wouldn't pass. The roll bar would add to safety though, but I doubt that tech would be too happy.

Funny that you mention the nuts pulling through the body Joe. I started changing my body mount bushings, and three bolts were good. The rest were toothpicks, so that cage wouldn't have help me too much. My car body probably would have left the frame with any impact. My frame is now on the floor so that I can repair some rust and cracks.

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post #5 of 9 (permalink) Old Nov 19th, 13, 1:02 PM Thread Starter
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Re: Roll cage install

Quote:
Originally Posted by GRN69CHV View Post
Saw this article prior. What intrigues me is NHRA requirement. Body is secured to frame with rubber mounts, bolts and cage nuts. In event of a severe enough impact, I have seen cage nuts pull through body mount braces. If purpose of roll cage is roof collapse, would make more sense to isolate passenger compartment. IE, Camaro has requirement for steel reinforcement plates, while Chevelle they require attachment to frame, Never really understood this.
I agree with you. I think the difference has to do with the Camaro being "unibody"?

John Austin
Katy, Texas
'70 SS454 Chevelle "clone" project
My combo:496 BBC (454 +.060), Muncie 4 spd, Centerforce dual fric clutch, "781" heads 2.19/1.88, 12-bolt 3.73 Eaton posi, Scat forged rot assm (21cc Wiseco slugs for 10.4:1 CR), Lunati Voodoo billet 60213 hyd roller, Lunati hyd roller lifters, Scorpion 1.7 #SCP1014 roller rockers, Edelbrock Performer RPM, Holly 850 Dbl Pmpr (1" spa), Carter 172 GPH mech fuel pump, MSD R2R dist. #8360, O'reilly Master Pro coil, Weiand high volume mech water pump, 772 stock 7 blade fan, Hayden clutch, fan shroud & Hi-flow 160 deg T-stat, Doug's 2" x 3 1/2" headers
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post #6 of 9 (permalink) Old Nov 19th, 13, 1:07 PM Thread Starter
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Re: Roll cage install

Quote:
Originally Posted by MarkP View Post
That kit doesn't appear to even attach to the frame, so it wouldn't pass. The roll bar would add to safety though, but I doubt that tech would be too happy.

Funny that you mention the nuts pulling through the body Joe. I started changing my body mount bushings, and three bolts were good. The rest were toothpicks, so that cage wouldn't have help me too much. My car body probably would have left the frame with any impact. My frame is now on the floor so that I can repair some rust and cracks.
That article addresses harness requirements meeting NHRA/IHRA, but does not install the cage properly to the frame. I wonder how many guys installed cages in their race cars based on that article, went to the track, and were told by tech that they weren't legal and had to go back home?

John Austin
Katy, Texas
'70 SS454 Chevelle "clone" project
My combo:496 BBC (454 +.060), Muncie 4 spd, Centerforce dual fric clutch, "781" heads 2.19/1.88, 12-bolt 3.73 Eaton posi, Scat forged rot assm (21cc Wiseco slugs for 10.4:1 CR), Lunati Voodoo billet 60213 hyd roller, Lunati hyd roller lifters, Scorpion 1.7 #SCP1014 roller rockers, Edelbrock Performer RPM, Holly 850 Dbl Pmpr (1" spa), Carter 172 GPH mech fuel pump, MSD R2R dist. #8360, O'reilly Master Pro coil, Weiand high volume mech water pump, 772 stock 7 blade fan, Hayden clutch, fan shroud & Hi-flow 160 deg T-stat, Doug's 2" x 3 1/2" headers
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post #7 of 9 (permalink) Old Nov 19th, 13, 1:09 PM Thread Starter
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Re: Roll cage install

Quote:
Originally Posted by bracketchev1221 View Post
No it is not legal. All points should go to frame.
Thanks for confimation Ray

John Austin
Katy, Texas
'70 SS454 Chevelle "clone" project
My combo:496 BBC (454 +.060), Muncie 4 spd, Centerforce dual fric clutch, "781" heads 2.19/1.88, 12-bolt 3.73 Eaton posi, Scat forged rot assm (21cc Wiseco slugs for 10.4:1 CR), Lunati Voodoo billet 60213 hyd roller, Lunati hyd roller lifters, Scorpion 1.7 #SCP1014 roller rockers, Edelbrock Performer RPM, Holly 850 Dbl Pmpr (1" spa), Carter 172 GPH mech fuel pump, MSD R2R dist. #8360, O'reilly Master Pro coil, Weiand high volume mech water pump, 772 stock 7 blade fan, Hayden clutch, fan shroud & Hi-flow 160 deg T-stat, Doug's 2" x 3 1/2" headers
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post #8 of 9 (permalink) Old Nov 19th, 13, 1:24 PM
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Re: Roll cage install

In fact, it was common to put the rear braces through the trunk to the upper spring mounts to support the upper spring and upper control arm mounting points.

Ray


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post #9 of 9 (permalink) Old Nov 19th, 13, 1:42 PM
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Re: Roll cage install

You may want to get in contact with NHRA and order a rule book, the 2014 should be available now or in the near future.

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