Re: Roll cage/ mini tub
Beg, borrow, or steal a NHRA Rulebook and follow the directions given by the book.
The rulebook can be an older one, the same instructions/rules given for a rollbar.
Have the car loaded and setting on the ground/floor with full weight, if possible.
If not, have the frame/car sitting level at all four points.
The main hoop will have a horizontal bar behind the seat and sidebars going from the main hoop to the front of the doors. The junction of the horizontal bar and sidebars on the main hoop should be at the same position for better support, less leverage from each to the other in case of, God forbid, a rollover.
Having the seat sitting in your normal operating position will determine how the rollbar will be built after the main hoop goes in, as to the rear horizontal bar and sidebars placement. Wear a helmut for main hoop height.
Gusseting the corners is not a bad idea.
DOM mild steel tubing is nice, min wall thickness is 0.118"
4130 Chrome moly tubing is better, has a min wall thickness of 0.083"
Rulebook gives a chart as to OD and WT of tubing, Section 16.
Six inch by six inch by 0.125" thick steel plate shall be welded to the frame or frame structure for the rollbar attachment places.
The rear bars can go throught the rear deck so the rear seat can be mounted for a complete interior.
Remember, the rollbar has to work ONCE. It is sacrificial, you are not.
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