roll bar

[Panamared]

Hi guys.

I was wondering if anybody have the measurments for a roll bar.

I think is going to be better for me to build the bar instead of ordering.

Any help would be grateful.

thank you

[CANDYBLUE2+2]

IMO it's so much faster and less annoying to buy it and install...Unless you can bend pipe, weld pipe, grind it, finish it, pad it etc...it just dosen't seem like a great way to spend quality time to me, just my 2 cents.

[Panamared]

Hey Candyblue2+2.

I got your point. Always buy new stuff.

But this time I can get that part done by 60 to 80 bucks wich is nothing compare to others.

If you take a look at my car bodywork you can see all parts are home made and the body is perfectly done.

So this part is very easy to reproduce if only got the exact angles and measurments.

Thank You

[John Coffey]

Buy a 10' stick of 3/4" conduit and a bender. Measure and bend that as a template for your main hoop.

[jmortensen]

I used this drawing for my hoop. I gave it to a rally car fabricator and he adjusted things for his bender and bent me up a main hoop. It fits TIGHT. Really tight. Mine is attached at the rockers rather than to the floor.

http://album.hybridz.org/data/500/medium/7833tubeDimensions.JPG

Here is a thread on my rollbar, which will eventually become a cage, there is also a lot of discussion here that may help you: http://forums.hybridz.org/showthread.php?t=102715

[Panamared]

Thank you Fellows.

Antoher question.

Some bars have to be welded and others can be bolted right?

[BuDavid]

just a thaought.. for manufacturing this part, shouldn't we consider the material of the metal to be bent? stiffness or elasticity?

sometimes metal materials vary in the dynamic behaviour if you just mix some of them togeather..

in different words.. if you manufacture the exact same shape with same thickness.. would you get the same performance and for the long term not having a permanent plastic deformation of this part?

just a question..

[John Coffey]

Here in the USA our various race sanctioning organizations (SCCA, NHRA, NASCAR, NASA, etc.) specifiy tubing material type, OD, and wall thickness. We generally don't have a big selection to choose from if we want to race on a track somewhere.

And given the half-century of experience those same racing organizations have with accidents, roll overs, etc. their recommendations are correct. As someone who builds roll cages in race cars for a living, I would be reluctant to experiment with my customer's lives by trying alternative materials.

In the past, Porsche experimented with aluminum tubing (6061T6 2" OD .135 wall) in their roll cage construction on 934s, 935s, and 936s. They found that the cages worked well on the first impact but tended to fail on subsequent hits.

[jmortensen]

If you're doing it yourself you should weld it. That is superior to bolting it in. Mohamed, there is definitely a difference in materials. Most people use DOM tubing 1.5" x .120" wall thickness. Some prefer 1.75" x .095" wall thickness. Definitely use DOM or "Drawn Over Mandrel" tubing. Both of these tubing thicknesses are legal for SCCA/NASA road racing for the Z. For NHRA drag racing I think they require .134" wall tubing. You should check with the rule book of the sanctioning body you want to race with before you start building anything. Panamared, it sounds like you don't have much experience with this stuff. You might want to do some more research before you start welding on your car.

[Panamared]

Thank you guys.

Jon...U are right I dont have any experience with this stuff.

Your tips show me that You are a good source to solve this issue.

So any comment would be appreciated.

From anyone.

thank you.

[BuDavid]

thank you Jon, good tips..