X's weren't there yesterday but are today. Sup wit dat?
1) one thing i can think of that could be a problem with that design of a tie in is if you don't keep the tubes of the tie in and the cage centered over top of each other when bolted together, or at least as close as you can get them. the reason being is that if they're off by say 3 inches or so because it just happened to fit better that way, you can get a twisting effect on the plates when the force of a roll gets transmitted to the plate. think of lifting one end of a board while pushing down on the other end. the tie in tube is the lifting force, the sandwich plates are the board and the cage tube is the downward force. when the two are centered over top of each other the force will pass straight through the body and into the tie in. this is probably intuitive to most people but i just thought i'd throw it out there :thumbsup:cjjeeper258 said:I have been pouring over all the info, links, and pictures in this thread and have learned quite a bit. However, I am new to building a roll cage and have a few questions. Bear in mind that I am not doing hill climbing or rock crawling in my present area but I recognize that the stock rollbar on my '78 CJ-7 isn't going to cut it in a rollover.
1. Tie ins. and bolt-ins.
Do the bolt-in cages just bolt to the body? Also I see a lot of tie ins from the frame going up to the body and ending with a plate to which the cage will bolt onto on the other side. This, I think, will be the route I will go but i was wondering if there are any important defects in this design. A set of 4 or more grade 8 bolts would be used in my design to anchor each plate to the other.
2. With the cages that are bolted to the tie ins off the frame, is there a possibility of body stress cracks becoming an issue?
3. Body Seperation
If I get into a serious enough accident, even with my new body bolts and poly bushings, the body may sheer off the frame. My anchor points for my belts and seats then become my concern since if they are attached to the body, I get hurt/killed should the tub and frame part ways. Am I correct in assuming that hte only way to fix this problem is to incorporate the seats and belts into the cage?
4. Design and what is available to me:
I have got this nice stock CJ-7 roll bar in my Jeep right now. I want to keep it where it is but tie it to the frame and add gussets where the tubes meet at the top. Then I want to install a front hoop tied to the frame. Then I plan to install tubing to connect the front and stock rollbar together, which now that I think about it would be similar to a YJ cage. I would incorporate diagonal tubing (triangulation?) to strengthen the cage where ever possible. Can anyone see any possble problems? I think I have covered all the bases, A pillar, B pillar, and strength.
Any input and info is appreciated
I have been talking to Butch at Four Wheel Supply down there and we are looking at June or August. Anything in particular in that time frame that would be best that you would be available? Can't wait to see that area down there.BESRK said:Zach, when ya gonna come down to Crozet and scuff that cage up a bit?
That will still work. The front section will be a little tight on the spreaders, but it will keep them from a flappin in the breeze.NWilhelm said:how about a viking top? they go directly on the roll bars... would that be a problem?