I just picked up an S&W weld in roll bar kit, and I'm wondering in regards to the rules of the rear bars.

Would I have a problem passing tech if my rear bars were in a slight "V" position, as opposed to parallel? The position of my 6x6 rear plates will only allow me to run the bars parallel if I hit the very top corners of the main hoop, and even then they wouldn't be exactly parallel to each other.
What I want to do is come in about a foot off each corner of main hoop and then down to the rear plates (sitting just UP of the spare tire tub)

The S&W "instructions" say to put them in parallel, and the NHRA rule book has a picture of them installed parallel, but the actual text says nothing against it.


Thanks in advance.

 

Pretty much straight back as possible to hit the reara frame rail. So that the rear gussets (6x6 plates) are welded to the frame rail. Not legal on the wheel tub. One other place that you can do it to as well, but you may encounter some tech inspectors giving you a hard time is to the strut towers in the rear.

Jason

 

Here's a pic.




The reason for the question is because I'd have to hit the very edge of this rear plate, and then the very corners of the main hoop. Going in from the corners of the main hoop and hitting this plate in the center would be easier to do, but I wasn't sure it that would cause me headache at tech.

 

So if you move in more towards the center of the main hoop, then it will enable you to hit hte center of that gusset more? If so that is fine. The only thing that would cause any say so at tech would be if you had to drop the rear kick back bars. You are allowed to do that, you can drop them 5" down from the top of the main hoop.

Jason

 

So it sounds like what I want to do there won't be a problem. Here's the mad photoshop skills.

 

hey man.. i would not place the bars so close to the center of the main hoop. u will without a doubt get some crap for it.. i had the same problem with my car as far as running the bars. just place them as far outward on the main hoop as possible. like in between the bends.. then get them as straight as possible to each other. i have had no problems with tech and thats what i did. or use the x style rear brace setup. good luck

 

The way I'm thinking, the bars wouldn't be close to the center of the main hoop, that's just how the drawing came up. More or less, will any tech be looking to make sure the bars are strictly parallel?

This is just one of those things that isn't mentioned at all in the rulebook, but I want to verify before I do anything.

 

If you can imagine the angle created between the top of the main hoop and the rear arm when looking at it from the back, that angle should ideally be less than a certain amount. I totally can't recall what that value is, and the value I know is specifically for roadracing, but given that it's a safety issue whether you're at the strip or road course, I imagine the theory would apply in either case. You may want to read through some of the archived rollbar threads in the RR/Autox forum about it.

 

Thanks for your help guys. Check out the progress.

https://honda-tech.com/zerothread?id=1268061