Quote:
Originally Posted by Iceman_TA
Hahahahahahah
Why?
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Go here and read up......
http://www.nhra.com/tech_specs/sport...C_Rulebook.pdf
Section 4.10
4:10 ROLL BARS
Mandatory in all cars running 11.49 or quicker, or per Class
Requirements. 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 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. Roll bar 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.
Crossbar and rear braces
must be welded to main hoop. 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 (i.e., pickup truck where body bolts to framerails)
must have roll bar welded or bolted to frame. Installation of
42 GENERAL REGULATIONS
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 chrome moly tube welding must be done by
approved TIG heliarc process; mild steel welding must be done
by approved MIG wire feed or approved TIG heliarc process.
Welding must be free of slag and porosity. Any grinding of
welds prohibited. See illustration. 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.
