johnc Posted November 29, 2007 Share Posted November 29, 2007 List how many things are wrong with this section of a roll bar that I cut out of a 240Z. Quote Link to comment Share on other sites More sharing options...
Lunar240z Posted November 29, 2007 Share Posted November 29, 2007 not DOM tubing for one. crush bent. correct? Quote Link to comment Share on other sites More sharing options...
JMortensen Posted November 29, 2007 Share Posted November 29, 2007 The hoop support is creased. Joints suck. Bends suck. Not only is the tube ERW, but it looks like exhaust pipe?!? Rust is generally not recommended. That was part of a roll bar? Yikes. Quote Link to comment Share on other sites More sharing options...
mull Posted November 29, 2007 Share Posted November 29, 2007 ERW (Electric Resistance Welded) means it's not seamless. Correct? Looks like it's only been tack welded in some spots. Quote Link to comment Share on other sites More sharing options...
johnc Posted November 29, 2007 Author Share Posted November 29, 2007 ERW seamed tubing. .063" wall. Crush bends. Crimped joint fitup (tubes not fsh mouthed, just crimped and pounded into shape). Large joint gaps filled with weld. Joints not welded 360 degrees. Never painted or rust proofed. What you can't see is that the main hoop had 8 crush bends and was made of three peices of tubing butt welded together. The mounting plates are .063" steel sheet and tack welded to the body. Just for the hell of it I hit the driver's side door bar (it was a NHRA style 6 point roll bar) with a 5 lb. sledge hammer and bent it in about 3". This car was raced for a while, somewhere. Luckily it never got in a big wreck. Quote Link to comment Share on other sites More sharing options...
JMortensen Posted November 29, 2007 Share Posted November 29, 2007 Wow. That sounds amazingly bad. Quote Link to comment Share on other sites More sharing options...
MrFancypants Posted November 29, 2007 Share Posted November 29, 2007 Not only is the tube ERW, but it looks like exhaust pipe?!? I thought the same thing -- looks like someone tried to reuse a stock exhaust as a roll bar. Thats hilarious. How bad was the rest of the car? - Greg - Quote Link to comment Share on other sites More sharing options...
G.I.jonas Posted November 29, 2007 Share Posted November 29, 2007 LOL exhaust tubing bent with a harbot freight bender and arc welded together,I wonder if a member here did that lol. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted November 29, 2007 Share Posted November 29, 2007 Wonder how it would feel to be beaten to death by your own roll cage? That seems like it would show ya. Evan Quote Link to comment Share on other sites More sharing options...
Pop N Wood Posted November 30, 2007 Share Posted November 30, 2007 Large joint gaps filled with weld. Hey, that was my idea. Git r done Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted November 30, 2007 Share Posted November 30, 2007 More pics please! Quote Link to comment Share on other sites More sharing options...
johnc Posted November 30, 2007 Author Share Posted November 30, 2007 I don't have any more pics. It really wasn't something I wanted to immortalize. The rest of the car is in pretty good shape and will probably be in a magazine sometime in the future. Quote Link to comment Share on other sites More sharing options...
Tony D Posted November 30, 2007 Share Posted November 30, 2007 Wow, I thought it looked like exhaust tubing! 0.063 wall...not for me! I once had occasion (and believe I may have it on a VIDEO someplace) of seeing a Jeep CJ3B that went airborne, inverted, and landed on what LOOKED to be a substantial rool hoop. In fact, it was cast drain piping that was butt-welded from straight sections and elbows. Shattered on impact, pinning the driver under the vehicle. From all outward appearances it looked just like a brand-name commercially produced roll hoop. To think people do this kind of stuff is scary. Ignorance / Stupidity is one thing, but to do it intentionally whatever the reason is criminal. I hope nobody actually charged to do that job, and it was just some misinformed homebased hobby-builder who didn't know any better. I have teched some stuff where it was obvious someone welded washers into thinner tubing to give the appearance that the tubing used was 'specification'...that was a short tech session. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted November 30, 2007 Share Posted November 30, 2007 Tony, what do you mean by welding washers into the tubing? Thats scary, cast cage! Death wish. Evan Quote Link to comment Share on other sites More sharing options...
LS1 240Z Posted December 2, 2007 Share Posted December 2, 2007 show cage ! haha Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted December 2, 2007 Share Posted December 2, 2007 Cool, I might be able to use that as a downpipe with an external wastegate. Another common misconception is that a roll cage cannot double as an exhaust system. It makes for a nice heating system. Quote Link to comment Share on other sites More sharing options...
Ole-M Posted December 2, 2007 Share Posted December 2, 2007 Holy crap. Is this what you call a false sense of security? lol Quote Link to comment Share on other sites More sharing options...
Chaparral2f Posted December 3, 2007 Share Posted December 3, 2007 Er, I suppose that means PVC pipe isn't up to spec? Quote Link to comment Share on other sites More sharing options...
Tony D Posted December 3, 2007 Share Posted December 3, 2007 It was common for people to use the exhaust tubing, and spotweld a washer inside so when they drilled the inspection hole that shows what thickness the piping is, it looks thicker than what it really is! Usually they did a bad job, and you could see the seam between the two. But some guys were pretty good at brazing, soldering, or simply painting it good enough to cover it up and make it look 'thick'. Once enough people were doing it, the inspection hole was to be drilled by the inspector at a point of his choice. That stopped the B.S. Straightaway. Holes for venting so you didn't get blowout when welding were to be drilled in the mounting plates...yeah that was the nezxt excuse to dodge the rules. Quote Link to comment Share on other sites More sharing options...
Evan Purple240zt Posted December 3, 2007 Share Posted December 3, 2007 Ahhh I see. Thanks for the education. Evan Quote Link to comment Share on other sites More sharing options...
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