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Posted by: McMark Nov 15 2010, 07:48 PM

I've got a customer project in the shop that has a bolt in roll cage, which has been welded in. It had padding on the tubes when it came in, but I had to remove the padding and found these nasty bends in the pipe. I don't like the look of these bends, but what kind of experience do you all have with them? Is this against any racing body rules?


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Posted by: bam914 Nov 15 2010, 08:18 PM

That will not pass tech down here. The bends can not be collapsed like that.

Posted by: jd74914 Nov 15 2010, 08:45 PM

Those tubes are yielded and would be worthless in the event of a crash.

Posted by: Rand Nov 15 2010, 08:46 PM

Ouch. Wrong way to cheap out. Totally compromised the strength of those bends.

Welding a pre-shaped arc in between the straight pieces would have been a better way to cut costs than that!

Posted by: McMark Nov 16 2010, 02:14 AM

That's what I was thinking...

Glad to know I'm not way off base.

Posted by: stownsen914 Nov 16 2010, 05:23 AM

Ya, really ... hopefully those will be coming out of the car to be replaced with new tubing! Looking at the pics, even the tubing looks weird, like it's hot rolled ERW or something (totally sub-standard for a roll cage) ...

Scot

Posted by: Brett W Nov 16 2010, 03:00 PM

Cut them out and put in a proper cage, or send the guy down the road. You don't want your name on that.

Posted by: SirAndy Nov 16 2010, 04:07 PM

I don't think so. I've seen the car. Right now, the only thing preventing it from folding into half is the roll cage, however bad it may be.

The front of the longs is completely rusted away on that car. And by that i mean GONE. That's what salty winter roads will do to a 914.

Posted by: Krieger Nov 16 2010, 07:32 PM

What about the rules of natural selection? Is he an organ donor?

Posted by: SirAndy Nov 16 2010, 08:44 PM

He bought it that way ... It's a real /6.

Depending on what he paid for it, i think that might make him a smart person ...

Posted by: McMark Nov 16 2010, 10:59 PM

Actually...........


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Posted by: Rand Nov 17 2010, 12:08 AM

Nice work Mark. Save it!
I wonder if adding gussets to the inside of the rollbar curves would be worthwhile hackage in this case. (Maybe not code for race rules, but certainly fix the strength issues). There are some beautiful examples of roll bar gussets out there (oogle Google).

Posted by: Brett W Nov 17 2010, 07:41 AM

leave the cage in to fix the rust, then remove the cage. No big deal.

Posted by: SirAndy Nov 17 2010, 12:22 PM

Looks crooked ...

Posted by: McMark Nov 17 2010, 02:28 PM

It's a feature.

Posted by: McMark Nov 17 2010, 06:39 PM

We're pulling the cage out.

Here's a couple more 'treasures' we uncovered today while considering the options.


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Posted by: Eric_Shea Nov 17 2010, 07:18 PM

LOL... that was a tough decision!

Posted by: brilliantrot Nov 17 2010, 07:47 PM

Might want to think about removing your watermark from those photos. That is ugly enough for me to not even want my name associated with call it bad should my association with it be taken out of context (as often happens on the internet). Seriously though what are people thinking when they build cages like this I certainly hope the PO didn't pay to have this put in.

Posted by: McMark Nov 17 2010, 07:49 PM

Good point!

Posted by: Eric_Shea Nov 17 2010, 08:17 PM

On a side note... I had some killer work done on a custum roll cage by the swell guys at "Original Customs"! Check it out!

Posted by: SirAndy Nov 17 2010, 08:43 PM

Olav, is that you?

Posted by: Krieger Nov 17 2010, 08:58 PM

I know a guy in Europe with a killer 914 jig he could send it to for repair.

Posted by: sww914 Nov 17 2010, 11:12 PM

At first I thought of suggesting that you gusset the crappy bends but after seeing the last photos I say that there's no good part of the cage at all.
Welding anything else to that would be like putting lipstick on a pig.

Posted by: Rand Nov 17 2010, 11:21 PM

Exactly.

If I had seen those last shots sooner I wouldn't have mentioned gusseting.

Should have known though... I am picturing the builder with a torch, heating some old pipe red hot and bending it. Then cobbing some turkey crap welds to "tie it in."

Aaannyway... Good news is, Mark has cleaned it up.

Posted by: Racer Chris Nov 18 2010, 12:15 PM

I'd sooner f*ck the pig than drive that car at speed.

Posted by: rick 918-S Nov 27 2010, 06:05 PM

OMG!

Posted by: sixnotfour Nov 27 2010, 08:45 PM

SCCA GCR
1. One (1) continuous length of tubing shall be used for the main
hoop member with smooth continuous bends and no evidence
of crimping or wall failure. The radius of bends in the roll cage
hoop (measured at centerline of tubing) shall not be less than
three (3) times the diameter of the tubing. Whenever possible,
the roll cage hoop should start from the floor of the car, and, in
the case of tube frame construction, be attached to the chassis
tubes by means of gussets or sheet metal webs with support
tubes beneath the joints to distribute the loads. It is recommended
that gussets be used.

Posted by: sean_v8_914 Dec 2 2010, 12:50 PM

why are you guys so hard on pigs? they are fine tasty creatures. the pig did not weld that cage in there. leave the pig alone or Ill calll the NPDOA

Posted by: Racing916 Dec 2 2010, 08:28 PM

haha that is funny