: TJ Roll Cage Design Issues


rocket
06-12-2002, 12:01 AM
Guys

Have a look at this photo....

http://www.eese.bee.qut.edu.au/QUAV/Rod/tmp/image007.jpg

Do you reckon that I should put the two supports in (that are blue). I have seen this on a few other jeeps (Seth Markowitz's TJ for example), but my only concern is that these bars are pretty close to my head and any side roll etc. would most likely result in a good hit to the side support bars - maybe not. Are they really worth the effort of putting them in?

I would have preferred one longer bar down the bottom at the rear but then the soft top cannot fold down with a bar in this place. The jeep is not totally off-roac hardcore and has to serve normal day to day duties as well - which is a bit of a bummer.



http://www.eese.bee.qut.edu.au/QUAV/Rod/tmp/image010.jpg

Do you reckon that I should put these braces in (blue again)? The problem is that they triangulated braces cannot be very big to keep the door operational. Do you think that they will make any/much of a difference to warrant the extra effort?

The seat frame base now ties into the front two seat mounts (not shown in this old photo) and I am thinking about tying the seat base down to one of the rear seat mount holes as well.

Any comments and advice much appreciated.

Thanks in advance guys.

Rod

bgreen
06-12-2002, 02:08 AM
what about using a small triangular plate that is about 3" long on the hypotenuse.

foley
06-12-2002, 08:50 AM
Originally posted by bgreen
what about using a small triangular plate that is about 3" long on the hypotenuse.

A fishmouthed tube will be a LOT stronger than a plate gusset, and will be lesslikely to cut you on the way in and out of the cage. I would lay a 2x4 or something in there and climb in / out a bunch of times, see how much gusset you can live with, and then decide if that size gusset is worthwhile.

Most racecars use about a 6" leg on the gussets of the halo and windshield frame.

bgreen
06-12-2002, 10:58 AM
A fishmouthed tube will be less likely to cut you on the way in and out of the cage.

That is a very good point, and one I had never considered. Thank you! :eek:

DavidO
06-12-2002, 08:17 PM
I don't think you're any more likely to cut yourself on a polished 1/8" plate than the edge of the door.

For an easy solution, take a look at these:

Competition Engineering Roll Bar Gussets (http://www.jegs.com/cgi-bin/ncommerce3/ProductDisplay?prrfnbr=867&prmenbr=361)

They also make a 10 pc. set for a little less but I don't have the link.

~dso

bgreen
06-12-2002, 08:38 PM
Originally posted by DavidO
I don't think you're any more likely to cut yourself on a polished 1/8" plate than the edge of the door.

No, but in an impact, the plate will probably slice right to the bone where the tube would not.

Cutter
06-12-2002, 09:04 PM
Originally posted by bgreen


No, but in an impact, the plate will probably slice right to the bone where the tube would not.
slice/crush...i feel your more likely to be hitting your head on the tube than to get something (finger etc.) sliced by a triangle gusset. But you would get used to duckin your head after hitting a few times, so either way would most likely be good.
BTW your rigs looking good:smokin:
these CE's look good http://www.jegs.com/photos/2473172.gif

bgreen
06-12-2002, 09:33 PM
Originally posted by Cutter

slice/crush...i feel your more likely to be hitting your head on the tube than to get something (finger etc.) sliced by a triangle gusset. But you would get used to duckin your head after hitting a few times, so either way would most likely be good.
BTW your rigs looking good:smokin:
these CE's look good http://www.jegs.com/photos/2473172.gif

I think you are right. But the tube brace would be stronger. Especially if you plated it in.