View Full Version : Check out this removable crossbar

03-16-2008, 12:17 AM
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.

JL ws-6
03-16-2008, 06:57 AM
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.

03-16-2008, 09:49 AM
Yeah, I figured as much. A little roll bar padding and no one will know :secret2:.

03-16-2008, 09:54 AM
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

03-16-2008, 10:07 AM
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.

03-16-2008, 10:21 AM
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.

03-16-2008, 11:56 AM
removeable crossbars are illegal.

03-16-2008, 09:47 PM
Yes, removable cross bars are illegal, but what do you guys think of this set up from a structural standpoint anyway?

03-16-2008, 11:11 PM
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.

03-17-2008, 05:10 PM
any and every bar in the car.
save your kids life in case of an accident.

03-17-2008, 06:47 PM
Not legal, so it doesn't matter.

12-12-2011, 08:59 PM
I know, old thread...but anyone know where I can find these joints?

12-13-2011, 12:25 AM