The main thing with a bolt-in bar is to have sufficiently large backup plates
on the other side of the sheetmetal. The SCCA (and every other sanctioning
body) has guidelines for this.
I had a main hoop bent up by a local racing fab shop with longer-than-required
ends, and then trimmed it so it would just barely fit under the soft top. As
it turns out, it should also clear the hardtop by about 1/8" although that
turned out to be more luck than good planning... if I'd done that properly I
would have positioned the main hoop about 1/4" further forward.
Still, if you are tall, then 'as high as the roof will allow' may not be
sufficient, given a minimum requirement for clearance between the top of your
helmet and the line between the windshield and the bar. If this is the case
then lowering the seat as much as possible will help this, as well as usefully
lowering the CG of the car.
Cheers,
Theo
> -----Original Message-----
> From: tigers-bounces@autox.team.net [mailto:tigers-
> bounces@autox.team.net] On Behalf Of Chris Thompson
> Sent: March 18, 2011 2:50 PM
> To: Allan Ballard
> Cc: Beamclub TIGER
> Subject: Re: [Tigers] Attaching a Rollbar
>
> How tall are you, Allan? The bigger issue that you'll like have is
> getting a roll bar sufficiently higher than your head and still be able
> to close the top.
>
> That being said, a bolt-in should do you ok. Note that the AutoPower
> roll bar is specifically marketed as a "show bar" as they don't
> consider
> their own product to be sufficient for roll-over protection. I'm not
> sure why. Although I can say that Virginia International Raceway
> thinks
> the AutoPower bar looks ok, excepting that I don't pass the "broomstick
> test", i.e. you can't lay a broomstick across the bar and the
> windshield
> without my head getting in the way.....
>
> Regards,
>
> Chris
> B382000331
>
> On 3/18/2011 4:14 PM, Allan Ballard wrote:
> > Is it effective to bolt a roll-bar to the car, or must it be welded?
> >
> > I plan to install a roll-bar and don't relish welds that are not
> easily
> > reversible.
> >
> > On the other hand, bolting a roll-bar into place is a poor solution
> if
> > a bolted roll-bar isn't strong enough to "do the job" in a worst case
> > scenario.
> >
> > Allan Ballard
> > MK1a Tiger
> > SIV Alpine
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