Has anyone used them? I'm really thinking about getting the "race" rollbar. It also says to call them so they can make one that's NHRA approved.
Any opinions? Need some feedback..
I guess I didn't realize you were actually using it for the track. That makes sense now. Sorry.
The bolt in cages are easy to install, but after alot reading on them. They dont seem as safe as you may think. There are stories of bolts shearing off, aswell as the bars themselves punching through the floors. There are afew stories of the company you stated.
You need to consult with "Lostforawhile." He's the king of metal work. I would think if you welded a little extra sheet metal at the mounting points that might help, too.
Hopefully, you will never have to find out if the roll cage "works."
When doing a cage you really need to reinforce the attachment points to the body. The purpose of the cage is to distribute (rollover) crash force throughout the rest of the body so that it doesn't concentrate in one area (the roof) and crush it. Adding thick reinforcement plates that are significantly larger than the tube bases is a good start. You would also want to pick attachment points where there is a lot of surrounding metal that is in "layers" or has a lot of structure around it. Large flat open areas are bad (like floor pans). Areas with lots of bends around it are better.
the reinforcement plates under the floor pans will go a long way, the floor sheet metal is not anywhere near thick enough in stock form, have you considered getting one of these bolt in cages, adding all the reinforcements, and then having someone weld it up in the car? it would be a heck of a lot stronger then just being bolted in. Whatever you do don't do what another unnamed member here did and make a cage out of exhaust tubing
He may not have aesthetic taste in his cars' modifications, but he damn well knows what he's doing.
Last edited by lostforawhile; 11-15-2011 at 04:07 PM.
Theoretically I suppose you could make a cage out of exhaust tubing, and have it be as strong as a proper roll cage. It's just that by the time you added enough extra tubing for strength, you wouldn't be able to get in it. The other problem with exhaust tubing is that is has much lower crush strength than something like 1.5" x 0.120" DOM tubing. So while it may withstand a fairly large distributed load, an impact that causes a dent will weaken the tubing significantly and likely cause it to buckle.
You don't have to use chromoly either. There are lots of cages built with regular mild steel, either DOM or even rolled tubing. It just depends on the level of protection needed, vehicle weight, race rules, etc.. Some info here:
completely made out of chromaloy tubing, and fabric covering, no tube bigger then what you might find in a bike, no injuries, pilot and passenger walked away, all in the strength of the tube and in one hell of a welder who I know personally
this is the frame, I have no idea who's standing in front of it, I've seen this same frame survive falling out of the air and having the wings ripped off, and still stay in decent shape, it's all in the materials and design, that frame is so light two people can easily lift it
Last edited by lostforawhile; 11-16-2011 at 05:27 PM.
For light weight sure, chromoly is great. High quality bicycle frames used to be made with it, although now at the high end steel has been replaced by aluminum and carbon fiber. It would be SO expensive to make an air frame from CF though.
I'm just throwing this out there, Autopower has been making SCCA legal roll bars for decades. They are a trusted brand and their reputation has NEVER been disputed. Autopower is no, "peel-and-stick" interwebz company. Autopower is Legit. Of course they are 2L2Q. Just saying...Probably one of the FEW companies making safe legal roll bars on a mass produced scale!