Here you go, John...
5.6 ROLLOVER PROTECTION
A. A roll cage is required for all vehicles entered in SCCA ProRally and SCCA ClubRally competition, and are recommended for SCCA RallyCross competition.
B. No change
C. Roll cages not constructed to FIA specifications must adhere to the following minimum specifications. Specific installations are subject to approval by the Chief Scrutineer.
1. The primary purpose of the roll cage is to protect the occupants of the vehicle during a rollover or serious accident. This purpose should always be considered during the design and fabrication of the roll cage.
2. Material: All required primary roll cage elements (including diagonals and side bars) must be constructed from seamless, DOM,CRW,WHR,or WCR mild carbon steel. Equivalent materials may be accepted upon the approval of the Chief Scrutineer. All required primary roll cage elements must adhere to Table 1 for diameter and wall thickness (for the purpose of determining tubing sizes, the vehicle weight is determined full of fuel and spares and race ready but without occupants).
3. Mounting: Roll cage terminal ends must be attached to the frame or body structure in locations that will support maximum impact loads and will not shear either in compression or tension (push through or pull from the structure). Mounting plates shall be welded to the frame or body structure, and must have a minimal area of 10 times the diameter of the tubing being attached (i.e. a 1.5" diameter tube would require a minimal mounting plate area of 15 square inches). The mounting plate must also be at least 2 times the diameter of the tubing being attached in any dimension. (i.e. a 1.5 diameter tube would require a plate at least 3.0" wide in any direction. a. Welded plates: Mounting plates must be at least 1/8" thick and must be attached such that the welding does not weaken that area of the vehicle structure. Roll cage mounting plates shall extend onto vertical structures of the vehicle (such as door sills or tall frame sections) wherever possible.
4. Welds: All roll cage joining must be performed by GTAW (TIG), GMAW (MIG), FCAW (flux cored arc), or SMAW (stick arc) welding. Oxy-acetylene welding and brazing are not acceptable. All welds must be of high quality with good penetration and exhibit no significant undercutting of the parent metal. All welds must also be 100% complete (i.e. must wrap completely around the perimeter of all tubes). Acceptance of any questionable welds is at the discretion of the Chief Scrutineer.
5. Bends: All bends in the roll cage tubing must be smooth and present a minimal amount of tubing distortion. Crushed tubing, such as that which occurs when using pipe benders, is not acceptable.
6. Required roll cage primary elements: All non-homologated roll cages must contain the following components at a minimum.
a. Main Hoop: Must be made from a single bent piece of tubing and be located no more than 10 inches behind the driver or codriver, or more than 5 inches in front of the back surface of the most rear-mounted seat. The Main Hoop must extend the full width of the driver/co-driver compartment, and must lie in a plane less than 20 degree from vertical. The top surface must also be at least 2 inches above the helmet of the driver when in normal seated position. The Main Hoop is required in all roll age configurations.
b. Front Hoop: Similar to the Main Hoop, but located around the front windshield. This Hoop must fit reasonably tight to the body structure in order to minimize obstruction of the view through the windshield.
c. Roof Bars: Two Bars must join the Main and Front Hoops. These Bars must be located as close to the sides of the roof structure as possible, and must be at least 2 inches from the driver and co-driver's helmets when in normal seated position.
d. Rear Bars: Two Bars must join the Main Hoop to the rear of the vehicle. These Bars must attach to the Main Hoop as close to the upper bends as possible, but no more than 6 inches below the top surface of the Main Hoop and not closer to each other than where the Roof Bars attach to the Main Hoop. These Bars must be kicked rearward at the bottom at an angle of at least 30 degrees from vertical. These bars must be straight and not contain any bends.
e. Diagonal Lateral Bar: Must run from one upper bend of the Main Hoop to the lower end of the Main Hoop opposite leg (either side upper bend is permissible). Must be attached as close as possible to the upper bend and the lower attachment point as possible. An additional bar shall run from one upper bend of the Main Hoop to the lower end of the opposite Rear Bar.
f. Side Sill Bars: Two Bars must join the Main and Front Hoops. These bars must be located as close to the horizontal as possible, and must be no more that 6 inches above and 4 inches inward from the lower door sills. Additional door bars may be added, but these Side Sill Bars are still required on each side of car.
g. Alternate design - Side Hoops: Instead of using a Front Hoop and Side Bars, these components may be substituted with Side Hoops and a Windshield bar. These Side Hoops must extend from the Main Hoop, one on each side, forward and along the Apillars to the floor. A Windshield Bar then joins these two just above the windshield. All clearance rules still apply.
h. Alternate design - Halo Hoop: Instead of using a Front Hoop and Side Bars, these components may be substituted with a Halo Hoop and Windshield Legs. The Halo Hoop is a single piece of tubing bent to run from the windshield, then back to the Main Hoop on the opposite side. Windshield Legs then connect the Halo Hoop, along the A-pillars, to the floor. All clearance rules still apply.
i. Front Gussets: Must join the Front Hoop and Roof Bars (or Side Hoops and Windshield Bar, or Halo Hoop and Windshield Legs) on both sides of all junctions. These Gussets may be made from tubing at least ¾ inches in diameter and .060 inches thick, and must extend onto each joined tube at least 2 inches but not more than 3 inches. As another option, tubing of the same thickness and diameter as the roll cage tubing may be split and formed into Gussets and must extend onto each joined tube at least 2 inches but not more than 3 inches. Regardless of which type of gussets are used, they must be fully welded all around.
j. Other Designs: Roll cages of other designs may be accepted by the Chief Scrutineer upon presentation of certified data verifying that this design is able to withstand the simultaneous application of the following three loads onto the roof plane of the structure (as if the vehicle were upsidedown and the loads applied by the ground) * 1.5 G lateral load (either direction) * 5.5 G fore/aft load (both directions) * 7.5 G vertical load (compression) G is calculated with the vehicle fully loaded (including occupants)
7. Padding: Any portion of the roll cage which could come in contact with the driver or co-driver's helmet must be covered with energy absorbing material (high density) of a minimum thickness of ½ inch. 8. Inspection: An inspection hole of at least 3/16 inch diameter and at most ¼ inch diameter must be provided in a non-critical, non-curved area of the Main Hoop to facilitate verification of wall thickness. Weight Tubing Size up to
2499 1.500 x .095
2500 to 3499 1.500 x .120 or 1.750 x .095
3500 to 4499 1.750 x .120