accuracy1

does any one know where to find the rules on roll cages for 10.99 and faster for nhra? i need to know how many points the cage has to have? just need to know i can get away with 8 point or do i need the windsheild bars? thanks

12SecHatch

http://www.nhra.com
u might be bale to download the info there

accuracy1

it doesnt state teh actual points it has to have thanks anyways

20lb.teg

I would talk to Grey from Millenium. I think either he or Chad (with the 240) has the rule book up there... By the way is this someone from Accuracy Automotive...?

Later,

Sean C.


[Modified by 20lb.teg, 3:52 AM 1/12/2003]

littlebluecrx

for 10.99, you can have a 6 point, if you have unaltered fire wall, but most hondas will go over 135, very near the 10.99 wall, so I would get a 10 point, you do not need the front knee bar, or lower sill bars, but you do need a certification, once you get a complete cage, you also need window net. If you want to stay legal with a 6 point, you have to stay under 135. You also need a liscense for mile an hour, it is the same as a 9 second licsence, talk to your local track, also look at import rules @ www.nhraimport.com
Jason

MotorMatrix.com

holy crap i didnt know the mph was factored into the cage rules. what about local tracks do you think they really care about mph as long as you have a cage. I mean as long as its not an idrc or nhra event?? I'm just looking to bust out some good times in my street car w/o breaking the bank on a cage.

simple4012

jason i think that a 6 point cage requirment starts at 11.99......i could be wrong though.

20lb.teg

Well here is the article straight from the NHRA rulebook:
4:11 Roll Cage
Mandatory in all cars running quicker than 10.99 seconds or faster
than 135 mph, or per Class Requirements. Cars with unaltered
firewall, floor, and body (from firewall rearward, wheeltubs
permitted) running between 10.00 and 10.99, roll bar permitted in
place of roll cage, or per Class Requirements.
All cage structures must be designed in an attempt to protect the
driver from any angle, 360 degrees. All 4130 chrome moly (CM)
tube welding must be done by approved TIG heliarc process; mild
steel (MS) tube welding must be approved MIG wire feed or TIG
heliarc process.Welding must be free of slag and porosity. Any
grinding of welds prohibited. Additionally, roll cage must be padded
anywhere the driver's helmet may contact it while in the driving
position. See illustrations on page 75.
With driver in driving position, helmet must be in front of main
hoop. If helmet is behind or under main hoop, additional tubing,
same size and thickness as roll cage, must be added to protect
driver. Main hoop may be laid back or forward, but driver must be
encapsulated within the required roll-cage components. On
unibody cars with stock floor and firewall (wheel tubs permitted),
the roll cage may be bolted or welded to the floor/rocker box via 6-
inch x 6-inch x .125-inch steel plates similar to the roll bar
attachment requirements of paragraph 4:10, page 73. Unless
attaching to OEM floor or frame, the minimum requirements for a
frame member to which a roll-cage member is attached are 1 5/8-
inch x .118-inch MS or .083-inch CM round and/or 2-inch x 2-inch
x .058 MS or CM rectangular.
All cage structures 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 required rear braces must
be installed at a minimum angle of 30 degrees from vertical and
must be welded in. Side bar must pass the driver at a point midway
between the shoulder and elbow.


Unless an OEM framerail is located below and outside of driver's
legs, a rocker or sill bar, minimum 1 5/8-inch x .083 CM or .118 MS
or 2-inch x 2-inch x .058-inch CM or MS rectangular, is mandatory in
any car with a modified floor or rocker box within the roll-cage
uprights (excluding 6 square feet of transmission maintenance
opening). Rocker bar must be installed below and outside of driver's
legs and must tie into the main hoop, the forward hoop, frame, frame
extension, or side diagonal. Rocker bar may not tie into swing-out
side bar support. If rocker bar ties into side diagonal more than 5
inches (edge to edge) from forward roll-cage support or main hoop,
a 1 5/8-inch x .083 CM or .118 MS brace/gusset is mandatory
between the diagonal and forward roll-cage support or main hoop.
Swing-out side bar permitted on OEM full-bodied car, 7.50 e.t. and
slower. The following requirements (a through d) apply:
a. 1 5/8-inch O.D. x .083-inch CM or .118-inch MS minimum.
Bolts/pins must be 3/8-inch-diameter steel, minimum and in
double shear at both ends.
b. Male or female clevis(es) permitted. Male clevis must use two
minimum 1/8-inch-thick brackets (CM or MS) welded to each
roll-cage upright; female must use minimum 1/4-inch-thick
bracket (CM or MS) welded to each roll-cage upright. Pins must
be within 8 inches of the vertical portion of both the forward
and main hoops. A half-cup backing device must be welded to
the vertical portion of the main hoop (inward side) or the upper
end of the swing-out bar (outward side), minimum .118-inch
wall (CM or MS) extending at least 1 5/8 inches past the center
of the pins. A clevis assembly using a minimum .350-inch-thick
male component and two minimum .175-inch-thick female
components may use a 1/2-inch-diameter Grade 5 bolt and
does not require a half-cup backing device.
c. Sliding sleeves of 1 3/8-inch x .083 CM or .118 MS, with
minimum 2-inch engagement, are permitted in lieu of the upper
pin/cup.
d. All bolt/pin holes in the swing-out bar must have at least one
hole diameter of material around the outside of the hole.
On all cars requiring a roll cage, if the OEM firewall has been
modified (in excess of 1 square foot for transmission removal, not
including bolted-in components), a lower windshield or dash bar of
1 1/4 x .058-inch 4130 chrome moly or 1 1/4 x .118-inch mild steel
is mandatory for connecting the forward cage supports.

littlebluecrx

I know, it is required for 11.99, he was asking about 10.99, cage requirements, I said a roll bar can be used if speed is under 135, and unaltered floor, and fire wall.
Jason

littlebluecrx

My local nhra track would not let me run, once I hit 135, till I got a cage, and certification, and liscence. Jason

tractionbar2nr

just to lead you to something more solid. call jim skelly at nhra 626-914-4761. he will be able to answer any of your questions a 100% without question. jason is right on the speeds and et but i do know that rule books can be very unclear sometimes. just call jim, he is the import guy at nhra.