I wrote:
> >Roll *bars* can be welded -- roll *cages* have to be bolted in. In any
> >case, what you've described is a bolt-in roll bar. Welding in the
chassis
> >reinforcement doesn't change the fact that the connection between the car
> >and the roll bar is a bolt.
and Bruce replied:
> Actually, I believe the method of attachment for a "bolt in" bar/cage is
> spelled out very clearly in the rules and I don't belive it allows for
welding
> ANYTHING in place. It specifies bolts and plates.
I go on:
13.2.C.: Roll bars and roll cages may be added (See Appendix C). It is
strongly recommended that they be constructed according to Section 18 of the
GCR. Roll bars may be welded. Roll cages must be bolted, not welded, into
the automobile and within the driver/passenger compartment. A roll cage has
more than four attachment points to the body or frame, or has bracing both
fore and aft of the main hoop.
Appendix C (Solo II Roll Bar Standards), Part B.3 (Material): Mounting
plates and gussets shall be 3/16 inches minimum thickness. A minimum of
three bolts per plate is required for bolted mounting plates.
Appendix C, Part E.2 (Mounting plates): In the case of unitized or
frameless construction, mounting plates may be used to secure the roll bar
structure to the floor of the car. A backup plate of equal size and
thickness must be used on the opposite side of the panel with the plates
through-bolted together.
For roll cages, this *is* sort of ambiguous -- one section implies there is
an alternate means of attaching the mounting plate, and another states they
must be bolted together regardless. I guess someone will have to ask for
clarification on that one. Personally, wouldn't be completely happy with
bolted mounting plates -- too flexible -- but I'm not planning to install a
cage anytime soon.
Jamie
'92 Prelude Si
Speed Demon Racing
http://www.mindspring.com/~jsculerati/sdr
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