Ken
Gone but not forgotten
NHRA Rules governing rollbars...
I was asked a question regarding rollbars and the NHRA's rules for convertibles. I decided to respond here so that many may share the inquiry asked of me.
In the stock classes, the rules state:
I hope that helps you some Jerry.
And I hope all drag racers may have received some benefit from this.
I was asked a question regarding rollbars and the NHRA's rules for convertibles. I decided to respond here so that many may share the inquiry asked of me.
In the stock classes, the rules state:
ROLL BARS
Mandatory in A/S through M/S*, A/SA through M/SA*, and all convertibles. Front braces may not extend in front of the firewall. Six-point attachments permitted. Roll cages permitted. See General Regulations 4:10, 4:11.
GR 4:10 ROLL BARS
- All roll bars must be within 6 inches of the rear, or side, of the driver's head, extend in height at least 3 inches above the driver's helmet with the driver in normal driving position, and be at least as wide as the driver's shoulders or within 1 inch of the driver's door. Rollbar must be adequately supported or cross-braced to prevent forward or lateral collapse. Rear braces must be of the same diameter and wall thickness as the roll bar and intersect with the roll bar at a point not more than 5 inches from the top of the roll bar. Sidebar must be included on driver's side and must pass the driver at a point midway between the shoulder and elbow. Swing-out sidebar permitted. All roll bars must have in their construction a cross bar for seat bracing and as the shoulder harness attachment point; cross bar must be installed no more than 4 inches below, and not above, the driver's shoulders or to side bar. All vehicles with OEM frame must have roll bar welded or bolted to the frame; installation of frame connectors on unibody cars does not constitute a frame, therefore it is not necessary to have the roll bar attached to the frame. Unibody cars with stock floor and firewall (wheeltubs permitted) may attach roll bar with 6-inch x 6-inch x .125-inch steel plates on top and bottom of floor bolted together with at least four 3/8-inch bolts and nuts, or weld main hoop to rocker sill area with .125-inch reinforcing plates, with plates welded completely. All 4130 chromoly tube welding must be done by approved TIG heliarc process; mild steel welding must be done by approved MIG wire feed or TIG heliarc process. Welding must be free of slag and porosity. Any grinding of welds prohibited. (see illustration in book) Roll bar must be padded anywhere driver's helmet may contact it while in driving position. Adequate padding must have minimum 1/4-inch compression or meet SFI Spec 45.1.
GR 4:11 ROLL CAGE
- All cage structures must be designed in an attempt to protect the driver from any angle, 360 degrees. All 4130 chromoly tube welding must be done by approved TIG heliarc process; mild steel welding must be done by approved MIG wire feed or TIG heliarc process. Welding must be free of slag and porosity. Any grinding of welds prohibited. Plating of chassis prohibited in Comp for cars manufactured after 01-01-2002; painting permitted. Additionally, roll cage must be padded anywhere driver's helmet may contact it while in driving position. Advanced ET, Comp, Top Alcohol Dragster, Top Alcohol Funny Car, Pro Stock, Funny Cart and Top Fuel padding must meet SFI Spec 45.1. (see illustrations on pages 210-215).
I hope that helps you some Jerry.
And I hope all drag racers may have received some benefit from this.