Can a roll bar be used as a roll cage?
In any full-bodied vehicle however that maintains an unaltered firewall, floor, and body running between 10.00 and 10.99 (6.40 and 6.99) a roll bar is permitted in place of a roll cage. In these two photos, you can see the comparison between a frame and unibody car. On the left is a unibody car with the NHRA mandated 6 x 6 x .125
How big does a roll bar need to be on a car?
If you’re working with a car with an OEM frame, the roll bar/cage must be attached to the frame, while in unibody cars (which make up most late model cars), a 6-inch square steel plate measuring 1/8-inch thick must be welded to the floor as a base for each bar that makes its point of contact inside the car.
Which is the best material for a roll bar?
Your choice of material for a roll bar/cage comes down to one of two options: mild steel or chromoly. Each one, when built within the specifications of the NHRA rulebook, offers the same amount of strength and protection.
Where are the bars on a roll bar?
Notice the tubes that extend from the main hoop, along the top of the door opening, and down the A-pillar and past the kick panel. Also note the bar across the top of the windshield. These are the basic bars that would be required to convert a Roll Bar to a Roll Cage.
Do you need roll bars on a convertible?
Roll Bars Unless otherwise required by your class, 6 point roll bars are required on convertibles running quicker than 8.25. Roll Bar required on all cars (including T-tops) running quicker than 7.35. Roll Cages Roll Cages required on convertibles running 6.99 or faster than 135mph.
How long can you run on a roll bar?
In fact, as long as your vehicle retains the original floor, firewall, etc., the 8-Point Roll Bar below allows you to run as quick as 10.00 seconds in the 1/4 mile. The drawing below shows several tube options for roll cages.
In any full-bodied vehicle however that maintains an unaltered firewall, floor, and body running between 10.00 and 10.99 (6.40 and 6.99) a roll bar is permitted in place of a roll cage. In these two photos, you can see the comparison between a frame and unibody car. On the left is a unibody car with the NHRA mandated 6 x 6 x .125