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Discussion Starter · #1 ·
I'm about to have a roll cage put in my car. The ICSCC rules under which I fall require a 1.5" (1 1/2) diameter .120" thickness mild steel tubing construction. NHRA and other sanctioning bodies requires 1.625" (1 5/8) diameter, .120" thickness. I have no idea what SCCA mandates. Which should I go with, and why?
Thanks!
 

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Re: Roll cage tubing diameter 1.5 or 1.625? (ftillier)

Get ahold of Pete at Cascade Autosport http://****************.com/smile/emthup.gif . (www.cascadeautosport.com)

Oh yeah, tell him Gus sent you.


[Modified by metalheadgus, 1:35 AM 1-30-2003]
 

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Re: Roll cage tubing diameter 1.5 or 1.625? (ftillier)

autopower does the bars in 1 3/4 by .120 wall. that pretty much passes every sanctioning body in any form of racing.
if you jump around in different racing, that's the way to go.
 

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Re: Roll cage tubing diameter 1.5 or 1.625? (ftillier)

Mine is 1.75 x 0.090. It doesn't weigh much more than 1.5 x 0.120 or 1.625x0.120. Actually, it's about the same weight as 1.625x0.120. You should be legal with that no matter where you go.
More places can bend 1.75" diameter tubing (that's the standard diameter for NASCAR cages and most circle tracks require that diameter).
 

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Re: Roll cage tubing diameter 1.5 or 1.625? (rockit)

Per the 2003 SCCA GCR, the following roll bar tubing is required:
Vehicle Weight Tubing Size
without driver
Up to 1500 lbs 1.375 x 0.095
1500 to 2500 lbs 1.500 x 0.095
over 2500 lbs 1.500 x 0.120 or 1.625 x 0.120 or 1.75 x 0.095
The tubing material per the SCCA GCR must be seamless, or DOM (drawn over mandrel) mild steel tubing (SAE 1010, 1020, 1025 or equivalent), or alloy steel tubing (SAE 4130).
The main hoop tubing behind the driver must have a diagonal in the main hoop and a horizonal bar running the width of the main hoop. The horizontal bar will intersect the diagonal.
I feel the most important elements of a roll cage are the mounting plates. In the Improved Touring classes, a mounting plate can be a maximum of 100 square inches.
Be sure to have the mounting plates contoured to fit the rocker box. The mounting plates should extend onto the vertical section and top of the rocker box for additional strength. In my race Wabbit, the roll cage tubing is welded and braced to the top section of the mounting plates on the rocker boxes. I used 1/8 inch thick mounting plates. Definitely do not install the mounting plates only on the floorpan as the the floorpan is not strong enough. Regards, WWR.
 
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