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Nhra 6 Point Roll Cage Rules

Unless you put your pumpkin on the cage hose like a ripe melon because you`re not wearing a helmet. If you are wearing a helmet, roll the cage to the end. If you do not wear a helmet (for example, daily driver), a roll bar is more dangerous than no roll bar The crossmember or belt reinforcement performs several functions. It increases structural rigidity to prevent forward or lateral collapse. It also serves as an attachment point for belt straps. Wiring harnesses are usually attached to a support on the harness or to a circumferential belt via a welded bracket and bolt. The rod must be installed vertically within four inches of the driver`s shoulders, but not above. Door sidebars and sill bars must be made of the same 1.118″ thick 1 5/8″ structural steel as the main tire and front boom rods. The door bars are there to protect the driver in the event of a side impact and must be welded to the main support. From the main tire, it must pass between the elbow and shoulder of the driver. There is no specific angle or point at which the front side of the door bar must intersect, although it must weld to the front bar near the bottom 6 inches. The following drawing shows different pipe options for roll bars.

The rear descending tubes are missing in this drawing and would not be installed this way. Note the pipes that extend from the main bracket along the top of the door and along the A-pillar and above the kick plate. Also note the bar at the top of the windshield. These are the base bars that would be needed to convert a safety bar into a roll bar. The blue bars in the diagram represent the additional bar options in the door and engine compartment area. Whether you need it or not depends on the rules of the sanctioning authority under which you drive, the intended use of the vehicle and, in some cases, your personal preferences. In general, the main bracket is installed as close as possible to the roof or roof lining without friction. NHRA rules state: “All roll bars must be less than six inches from the driver`s rear or side of the head, extend at least three inches high above the driver`s helmet when the rider is in a normal riding position, or less than one inch from the roof/roof trim in the area above the driver`s helmet and be at least as wide as the driver`s shoulders or within an inch of the driver`s door. You can also lean the main tire backwards or forwards to get the right measurements.

In addition, the bottom of the main tire must be welded with a pair of 6-inch x 6-inch plates above. “A rocker arm or threshold strip of at least 1 5/8 inch x 0.083 cm or 0.118 MS or 2 inches x 2 inches x 0.058 cm or rectangular MS is mandatory in any car with a modified floor or tilting box inside the cage posts. Rocker arms must be installed below and outside the driver`s legs and must be integrated into the main tire, front tire, frame, frame extension or side diagonal. The rocker bar should not be attached to a swivel sidebar bracket. If the rocker arms are more than 5 inches (edge to edge) from the front roll cage bracket or main tire at the side diagonal, a 1 5/8 inch x 0.083 cm or 0.118 MS splint or gust fold between the diagonal and the front rollover cage bracket or main tire is required. Once in place, Sean welded the connector in place and followed the front and rear attachment points with a full weld. Wherever the connectors have been placed flat on the floor, they have been welded into it – even where our safety cage D rods are located. Rear brackets or rear grab bars must be attached to the bottom of the trunk.

Somewhere. NHRA rules are very vague when it comes to attachment points, although wheel arches are not an acceptable attachment point. In addition, there are a variety of rules for the total diameter of the pipe, depending on the length and number of crossbars used. When using 1 5/8 inch pipes, the back rods can be of any length or at any angle. This means you can write your name in italics with the rear bars, and as long as they`re connected to the rear floor, they`re technically legal. This tube allows the top of the rear descending bars to be welded anywhere in the horizontal section of the main tire or five inches or less vertically on the sides. The Alston kit we selected is made of 1 5/8″ mild steel with 1 1/4″ main tire support rods. “If a customer wants a custom cage that we don`t offer yet, they can use our custom safety cage worksheet and we can fold it to their specifications,” Wright said. The pipe size requirements of 8.50 cages are 1 5/8 inches x 0.118 inches of mild steel or 0.083 inches of chromoly.

For cars of 10 seconds and slower that only require roll bars, the minimum size is 1 3/4 AD. x .118 mild steel chromolytic tubes or .083 4130, so this is another aspect to consider when building or expanding a roll bar as your vehicle gets faster. Even though a chromoly cage is usually lighter due to its lower minimum wall thickness, it can only be welded TIG, while mild steel can be TIG or MIG welded, although the welds should be clean, completely without holes and show no signs of grinding. The saying “measure twice, cut once” is something to remember throughout the cage installation process. The pre-folded cages are intentionally lengthened to accommodate deviations in vehicle design. Also, weld the entire cage in place before welding it completely to ensure a better fit. In addition, all seats and seat supports that you plan to use for the vehicle must be installed. The driver or a person of similar stature must be present at the various check-in checks. We took the Mustang to the local Mckinney Motorsports race store to have the cage installed. Floor support panels Chris Alston`s complete chassis Turning cage, swing door rods and window mesh kit When it comes to preparing for the installation of a rollover cage, you need to remove everything you can from the car. These include carpets, seating, and door panels. As you know, welding is extremely hot and it is not shy when it comes to burning a hole in anything.

If you have a roof trim that needs to be replaced and you want to keep one with the cage in the car, replace it ahead of time to avoid a big headache. We will review the steps later when it comes to protecting the headliner during the final weld. A dashboard is not required in vehicles whose firewalls have been modified by one square foot or less, although a dashboard may be useful for attaching the lower part of the front cage together to reduce chassis bending. The forward-facing bars in front of the dashboard can be tricky when it comes to installing a dashboard, as they can get in the way of your legs, although there`s nothing to say you can`t bend the pole towards the firewall and run it there. While we chose not to use the dashboard at this time, the NHRA rule states: “If the OEM firewall has been modified (more than one square foot for removal of the transmission without bolting into components), a 1 1/4 x 0.058 inch 4130 chromoly or 1 1/4 x 0.118 inch structural steel dashboard is required to connect the the front cage. « Door sidebars, swings and rocker bars The following drawing shows a 12-point turning cage from Chris Alston`s Chassisworks. Note that it contains most of the pipes found in the 8-point roll bar, but displays the aforementioned bars above the doors, windshield, and through the firewall. Plus, you`ll notice that this particular cage comes with an X-shaped setup behind the main bracket, which usually goes to one of the suspension crossmembers for extra support. It sounds like a lot of pipes, but it`s still designed to be installed in a standard or fairly standard vehicle. Any car that goes faster than 9.99 seconds in the 1/4 mile must have a roll bar, according to the NHRA. The cage level required varies depending on the vehicle`s capabilities AND capabilities, but the 12-point roll bar below would allow a Camaro, Mustang, or other monocoque car to run as fast as 8.50 seconds in the 1/4 mile. If the vehicle in which this cage was installed has a full frame that is located outside the driver`s legs, the blue bar along the rocker is not necessary.

OEM anti-lock braking systems, OEM airbag functions, OEM/monocoque bearing chassis design, including OEM floors and firewall, and all other OEM safety systems must operate in accordance with the manufacturer`s specifications.

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