#1  
Old 07-29-2018, 09:57 AM
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leeklm leeklm is offline
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Default New 6pt roll bar?

Hey All,

Preparing for a NHRA legal 6pt bar in the 68 firebird, and wanted to check in here before diving in...

A buddy of mine has a tubing bender and installs roll cages in circle track cars- so will be helping me here. The plan is to use 1.75" / .118 mild steel, since that is what he normally stocks.

I would like to install swivel door bars for ease of entry/exit.

Any other considerations I should be thinking of other than what is pointed out in the NHRA rule book?

Thank you!

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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
  #2  
Old 07-29-2018, 10:12 AM
Chief of the 60's Chief of the 60's is offline
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I am not a fan of any "moveable" bars. That just creates a weak link. What times are you planning on turning (now and future)?

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Old 07-29-2018, 10:42 AM
BruceWilkie BruceWilkie is offline
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Quote:
Originally Posted by Chief of the 60's View Post
I am not a fan of any "moveable" bars. That just creates a weak link. What times are you planning on turning (now and future)?
Partially agree...
Drivers door swingout bar ... built well, with heavier than required hinge and pin points and nearly interference fit, and hinge/pin with greater sheer property ... ain't gonna go nowhere or be a weak link.

Before spending money... Talk with an NHRA inspector.

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Old 07-29-2018, 10:43 AM
Chief of the 60's Chief of the 60's is offline
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FYI: Your other thread has no access. Apparently this place is still messed up from when it crashed yesterday.

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Old 08-03-2018, 08:40 PM
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There is a sticky on this topic on YB. It has all the certifications needed for all types of cages.

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Old 08-03-2018, 09:14 PM
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I would go ahead and do a 10 or 12 point cage. You know you"ll wanna go faster in the near future.

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Old 08-03-2018, 11:00 PM
73 TRANSAM 73 TRANSAM is offline
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I think it needs to be a minimum .120 wall DOM tubing or .130 ERW but I could be wrong. I also believe that having a swing out side bar will not help with the chassis flex on a 6 point roll bar. Good luck.

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Old 08-04-2018, 07:18 AM
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Moly.

  #9  
Old 08-04-2018, 09:25 AM
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Quote:
Originally Posted by HO 67 BIRD View Post
I would go ahead and do a 10 or 12 point cage. You know you"ll wanna go faster in the near future.
This is true, which I was I wanted a 6pt cage. I needed something in place to help prevent me from going faster at a later date!!

Sent from my XT1585 using Tapatalk

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Old 08-04-2018, 10:34 AM
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Quote:
Originally Posted by leeklm View Post
Hey All,

Preparing for a NHRA legal 6pt bar in the 68 firebird, and wanted to check in here before diving in...

A buddy of mine has a tubing bender and installs roll cages in circle track cars- so will be helping me here. The plan is to use 1.75" / .118 mild steel, since that is what he normally stocks.

I would like to install swivel door bars for ease of entry/exit.

Any other considerations I should be thinking of other than what is pointed out in the NHRA rule book?

Thank you!
I was faced with that dilemma in my car, because I'm a "big 'ol boy" so they say. I ended bending a dogleg in the door bar instead of making it swing out and it works well for me. I went and did both sides that way.


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Old 08-04-2018, 11:37 AM
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Moly is the only way I would go.(lighter than MS) I am considering a cage too. I can only go to rentals because I have no cage. I figure go for the 10 pt. If it is custom made they run the bars so tight to the roof and windshield pillars they are not in the way anyway. The worst bars are the side bars. Those make the "not street" to me, and of course it kills getting into the back seat.

  #12  
Old 08-06-2018, 12:52 PM
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Ken MacNicol Ken MacNicol is offline
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.118 will be to thin at the bend to be legal

  #13  
Old 08-07-2018, 07:59 PM
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Quote:
Originally Posted by Ken MacNicol View Post
.118 will be to thin at the bend to be legal
This is a clip from the 2018 rule book that mentions .118 MS. Am I missing something? Also, does anyone have the link to the roll bar sticky mentioned on yellow bullet? I was unable to find that sticky...

thank you!
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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
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Old 08-07-2018, 08:44 PM
BruceWilkie BruceWilkie is offline
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Quote:
Originally Posted by leeklm View Post
This is a clip from the 2018 rule book that mentions .118 MS. Am I missing something? Also, does anyone have the link to the roll bar sticky mentioned on yellow bullet? I was unable to find that sticky...

thank you!
As Ken said... When you bend a tube it gets thinner on the outer curve from stretch that occurs while bending.
.118" will be less on corners.

  #15  
Old 08-07-2018, 09:18 PM
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I understand that, but would think NHRA has that factored into the .118 requirement?

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68 Firebird-- Street/Strip - 400/461 Eagle Forged Bottom End & Ross Flat top pistons. KRE 325 CFM D port, Ultradyne 263/271 @.050, .4267 lift. Crower Solid roller lifters and 1.65 stainless rockers. Quickfuel 1000 on Torker2 intake and 2" open spacer. Hedman 1.75" headers. TH400 w/brake. Ford 9" w/3.80 gears & 28x9 Hoosier pro bracket drag radial. Best ET: 1.35 60ft, 6.29 @ 107.20 mph, 9.99 @132.33 mph. 3,300 race weight
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Old 08-07-2018, 11:24 PM
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https://www.yellowbullet.com/forum/s...=certification

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