Originally Posted by luckyfasteddie
Thanks very much for that info. ? On the 5th and 6th points. My cab is not choped and my seats are up so I can drive without killing my back,Instead of angleing down from the main bar to the frame could I extend these bars straight out =parallel with cab floor and even with the top of the seat cushion and then angle down after they pass the front door pillar thus giving me and my passenger some side protection or should I angle them down and add an extra bar for the side protection.Could thick wall 2x2 tubing be used in lieu of pipe?
I assume you're describing the side bar that runs from halfway up the main hoop down to about where your left foot will be. This bar is designed to keep you in the car in the event the seat/shoulder belts fail. As viewed from the side of the vehicle, it must pass your body between the shoulder and the elbow. You can always run more bars than are called for in the rule book, but you must build the roll bar to the minimums described in the rulebook if you are going to pass NHRA technical inspection.
Thickwall 2x2 tubing is not acceptable if you plan to pass NHRA technical inspection. Minimum size for a roll bar is 1 3/4" OD x 0.118" wall round steel tubing. Minimum size for a roll cage is 1 5/8" OD x 0.118" mild steel or 1 5/8" x 0.083" chromoly.
If you have no plans to pass technical inspection at the drag strip and simply want to afford some protection for you and your passenger, then use any type materials you want to.
I urge you to purchase a NHRA Rulebook. You can get them from www.summitracing.com