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Check out this removable crossbar

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Old 03-15-2008, 11:17 PM   #1
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Default Check out this removable crossbar

Ok, I'm going to be installing a 6 point 4130 roll bar in my Z-28 over the next few weeks. The car is my daily driver and I do have an 11 year old step daughter who rides in the car sometimes, so I was a little concerned about the cross bar. Through some research I found this joit to make it removable. I know that a removable bar is not NHRA legal, but a few guys I've spoken to have gotten past tech with this. It seems much stronger than the traditional method of making a bar removable as these are machined out of solid 4130 and are held with 2 3/8" hardened bolts. These are used in off-road racing all the time, so I don't see them a s being a weak point. That joint should be stronger than the bars around it! Tell me what you think.
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Check out this removable crossbar-weld_004.jpg   Check out this removable crossbar-crap-20006.jpg  
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Old 03-16-2008, 05:57 AM   #2
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If you want to get thru tech, make some type of cover to go over that, because they won't like it regardless how strong it is.
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Old 03-16-2008, 08:49 AM   #3
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Yeah, I figured as much. A little roll bar padding and no one will know .
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Old 03-16-2008, 08:54 AM   #4
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actuallys a 10 point with swingouts is legal to 8.50 so they dont have to like it but by NHRA rules they will let you run
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Old 03-16-2008, 09:07 AM   #5
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Quote:
Originally Posted by WHITE DEVIL View Post
actuallys a 10 point with swingouts is legal to 8.50 so they dont have to like it but by NHRA rules they will let you run
Thats a cross bar, not a swing out, so its illegal.
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Old 03-16-2008, 09:21 AM   #6
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Removable seat cross bars have never been legal to my knowledge. Also, the 3/8" bolts are too small as swing out side bars require 1/2" bolts/pins minimum.
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Old 03-16-2008, 10:56 AM   #7
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removeable crossbars are illegal.
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Old 03-16-2008, 08:47 PM   #8
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Yes, removable cross bars are illegal, but what do you guys think of this set up from a structural standpoint anyway?
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Old 03-16-2008, 10:11 PM   #9
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I've used these on rock crawler chassis builds for non-primary loaded tubes and only near the node (like you have it)... It's about the best you get for a removable joint... Quite strong compression and tension, but only as strong as the bolt or threads in shear... Which is good because the crossbar is there to keep the b-hoop from deforming under tension and/or compression. I can't really tell, but I'd recomend a plug weld where the slug slides inside the tube.
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Old 03-17-2008, 04:10 PM   #10
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PLEASE
PLEASE
PLEASE
PAD
PAD
PAD
any and every bar in the car.
save your kids life in case of an accident.
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Old 03-17-2008, 05:47 PM   #11
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Not legal, so it doesn't matter.
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Old 12-12-2011, 07:59 PM   #12
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I know, old thread...but anyone know where I can find these joints?
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Old 12-12-2011, 11:25 PM   #13
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http://www.polyperformance.com/shop/...lamp-p-66.html
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Old 12-12-2011, 11:25 PM
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