roll bar build
#1
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roll bar build
this is just a picture of what i made last night.... i figured i'd atleast do something to keep me busy while doing my engine rebuild....ill post more pics as progress comes along. My bar is 1.25 inches. i dont quite remember the wall thickness but its damn thick enough that it didnt crumple like a soda can when i used it on this cheap hydraulic pipe bender. I first tried exhaust tubing to just get a feel for the bender. but it got squashed. In this picture i just sized up everything to make sure the width of the hoop contours the hardtop just right.
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^ definatly welding it in. right behind the seats, i still need to figure out where to weld plates at for the bars that go straight back.. Do they go somewhere by the rear shock tower?.. 18psi . i lied, and so did the sticker. It says 1.25 tubing but its definatly much bigger than that on the od or even the id. the pipe's wall thickness is 3/16. I made the main hoop out of 2 peices of piping. So, in the picture above, there is a gap. i filled in that gap by patching it up with piping welding it solid and grinding the welds down, then sleeving it. (pictures below) I definatly did not want this portion of the hoop to be a weak point so i put a preety long peice of rod inside half of the hoop, welded it to the pipe, then slid the other half of the hoop onto the rod, welded it onto it. Then the patch, then grinding, then sleeve.
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^ no worries. I dont plan on auto xing this car. Just mainly personal safety. Im sure the rod inside of the hoop, welding the seam shut, then sleeving the seam is much stronger than one solid piece. But, i could be wrong. i dont understand why it wouldn't be stronger
#12
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for now im only doing the back portion. I dont think i will be doing a full cage as that may prove to be more dangerous for a street application. if this is what you meant by the head to bar?. but i have the bar sitting behind the seat as possible and as high up to the roof as possible. Im using the design of miatacage.com, where they use plates onto the frame to weld the main hoop in. then two down pipes to the rear, then a diagonal section in the hoop... ehh instead of trying to describe how it will look . check out miatacage.com
#13
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the walls of the pipe are nearly twice as thick as miatacage.com. it had to be. If i were to use .095 (walls thickness) this bender would just have flattend the tubing. they are able to get away with using thinner walls cause they probally have godly mandrel benders. Dom - drawn over mandrel i believe is what that is called. Mandrel = no bottle necks to ribs, no crushed tubing. .1875 walled tubing+ cheap hydraulic bender = same thing.
#17
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^ its ok. Im sure no one would touch your car. Not here for your guys criticism. just here to give some outlines on people who want to make their own bar. Its up to them if they do it in one peice or 1000 pieces