Hi Mike,

You're right. 1/4" thick and 2-inches wide.

Here is the entire Driveline Section, FYI.

2:4 DRIVELINE

On any car in which the driver sits over or behind the rear-end
center section, a suitable protective shield of .120-inch minimum
thickness steel plate must be installed for units with universal
joints, securely mounted to the rear-end center section and the
bellhousing adapter. For straight couplers, the minimum shield
requirement is .063-inch aluminum, which must contain an inspection
cover for removal and inspection of the coupler securely mounted to
the rear-end center section and the bellhousing adapter, or as noted
in Class Requirements. In place of a crossmember, in the vicinity of
the front universal joint, all cars in competition using open
driveshafts must have a retainer loop 360 degrees in enclosure, 1/4-
inch minimum thickness and 2 inches wide, or 7/8-inch x .065-inch
welded steel tubing, securely mounted and located within 6 inches of
the front universal joint for support of the driveshaft in the event
of U-joint failure. Open drivelines passing any part of the driver's
body must be completely enclosed in 1/8-inch minimum thickness steel
plate, securely mounted to the frame or frame structure. Driveshaft
loop required on all cars running 13.99 (*8.59) or quicker and
utilizing slicks; except vehicles running 11.49 (*7.35) seconds or
slower equipped with street tires.


Chip

On May 2, 2008, at 7:04 PM, MIKE WILLMON wrote:

> Hey thanks. Does it specify material like steel, 1/4" thick and 2"
> wide?
> Just going from memories here.
>
> Thanks again.
>
> Mike
>
> ----- Original Message -----
> From: Chip Gribben <futurev@...>
> Date: Friday, May 2, 2008 1:21 pm
> Subject: Re: [NEDRA] NHRA Rules on Drive Line Loop
> To: NEDRA@yahoogroups.com
>
> > From 2008 NHRA Rulebook
> >
> > Under Section 4 General Regulations - Drivetrain 2:4 " . . .
> > securely
> > mounted and located within 6 inches of the front universal joint
> > for
> > support of the driveshaft in event of U-joint failure."
> >
> > It doesn't mention a 2 inch minimum, it just says "within 6 inches".
> >
> > There is actually a drawing of it and the drawing shows a 6-inch
> > max
> > distance from the U-joint.
> >
> > Chip
> >
> > On May 2, 2008, at 3:45 PM, MIKE WILLMON wrote:
> >
> > > Anyone near an NHRA rule book and can tell me if the drive line
> > > loop has to be "not closer than" or "not further than" 2 inches
> > > from the front U-joint?
> > >
> > > Mike
> > >
> > >
> >
> >
>
>