Marshy7771
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| posted on 7/4/05 at 09:38 AM |
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MK INDY Roll Bar Fitting
I need advice on how to fit the rollbar. I bought a pre drilled roll bar from MK and have had it powder coated.
I have marked and drilled the two inside holes through the box section and fitted M8 size bolts, however the two outside holes dissapear down the
chassis tubing when drilled.
What bolts should be used for the two outside holes?
Thanks,
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mookaloid
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| posted on 7/4/05 at 10:40 AM |
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Rivnuts seem to be a popular option for this.
Cheers
mark
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ned
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| posted on 7/4/05 at 10:45 AM |
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I'd be suprised if rivnuts would be strong enough?
A rollbar should be able to cope with the car be rolled over funnily enough, I would expect arivnut couldn't cope with the forces involved
surely?
I welded my rollbar on, but bolting is fine, though I wouldn't use rivnuts, unless I've got it completely wrong and you're talking
about an anti-roll bar?!
Ned.
[Edited on 7/4/05 by ned]
beware, I've got yellow skin
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Marshy7771
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| posted on 7/4/05 at 11:06 AM |
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i want to use bolts for strength but just can't see how to use bolts for the outer two holes.
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mookaloid
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| posted on 7/4/05 at 11:09 AM |
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Hi Ned,
I went through the same thought process with my first roll over bar.
MK suggested I use rivnuts and even introduced me to a guy who had rolled his Indy with a bar fixed in this way and it had held up ok apparently!
For competion use I relpaced it with a welded one with diagonals and a removable stay into the passenger footwell to RAC standards.
The standard MK roll over hoop has no diagonals or back stays so it is mainly decorative anyway IMHO.
For the record, when the bolt on hoop was removed It was a hell of a job to get it off as I had stuck it with sikaflex and I got the impression that
it would have held up with no bolts at all!
Cheers
mark
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Hellfire
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| posted on 7/4/05 at 11:30 AM |
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Provided it has the two rear braces, I would have no problem with using rivnuts again. Like Mark, we used PU Adhesive to fasten the rollbar as well as
rivnuts and bolts through the chassis. When we came to remove the rollbar, the PU adhesive stripped the chrome off the underside of the plates
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adam_moore
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| posted on 7/4/05 at 11:41 AM |
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I don't have the rear brace on my roll bar. I used bolts through the chassis tube on the inner side with large washers to prevent tube collapse
when tightening. On the outside, i used rivnuts. on the inside I have washers between the rollbar and the chassis to bring everything to the same
hight as the rivnuts.
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carnut
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| posted on 7/4/05 at 12:56 PM |
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I'd never use rivnuts for a roll bar! I used 4 bolts on each side. For the bolts where there is a chassis tube, I drilled it larger andput a
piece of tube in to stop it from crushing when tightened up.
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Crazy Jay
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| posted on 7/4/05 at 01:17 PM |
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We had the same problem, wat we did was on the outside edge of the bar jus drill 2 holes, close together, so the bolts go thru these and the chassis
(not very good at explaining)
 
Description
[Edited on 7/4/05 by Crazy Jay]
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Marshy7771
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| posted on 7/4/05 at 01:27 PM |
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Thanks for the pic
Seems a good solution, its just that i got mine pre drilled fropm MK and I have had it powder coated now
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Crazy Jay
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| posted on 7/4/05 at 02:15 PM |
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 ah unlucky, how bout tryin to patch up the holes wit round bits of metal?? 
I jus found out that the only chroming place in, pretty much ireland, doesnt do rollbars!! So does anyone know of any places that i cud post too, and
that wont have a waiting time of a month??
Cheers
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MkIndy7
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| posted on 7/4/05 at 06:58 PM |
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We went with the Two bolts all the way through on the inside, and just 1 all the way through on the outside ( like the pic that had 2 on the outside)
and it passed the SVA fine.
You said the holes were already drilled, could you go for a pattern of 6 bolts?.
Drill another all the way through on the inside in the centre of the other 2 bolts and put two into chassis (effectively fake)
on the outside as well as the 1 in the middle on the outside all the way through
Making a pattern like a number 6 on a dice
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Marshy7771
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| posted on 8/4/05 at 09:37 AM |
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Thanks mate. Gonna have a go at it this weekend. Will let you know what I do in the end.
I see your in Leeds, i live in Barnsley but work in Leeds. Do you know any other MK owners in yorkshire?
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Hellfire
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| posted on 8/4/05 at 11:20 AM |
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Yep, theres quite a few of us 
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Jonte
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| posted on 8/4/05 at 12:24 PM |
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I did like Crazy Jay with 4 M10 bolts. Don´t know what you call them in UK, but translated from swedish it would be wagonbolt 
Here´s a pic where you can see some of it
Click it
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indykid
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| posted on 8/4/05 at 01:52 PM |
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they look like coach bolts.
i did it with 3 as well, but M10. surely a pair of M10 HT bolts per side would suffice, then just cut bolt heads off to dummy the other 2 with a bit
of sikaflex to hold the bolt head on.
as for the MK back bracing on yours hellfire, i cant see how it is any better than a standard bar, as there is no real support down to the chassis, as
it is not a straight run to the base of the back panel. it should be more like the luego one to be of significant structural strength. IMO of
course
and i'm in dewsbury and with indy.
tom
just about addressed everyone i think
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tim windmill
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| posted on 8/4/05 at 02:12 PM |
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i,m a yorkshire lad.
do you other yorkshire lads ever meet up?
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flak monkey
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| posted on 8/4/05 at 02:14 PM |
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I dont think coach bolts are rated to any standard...they are only designed to hold shed doors on and wooden panels together really.
Remember the fixing of the rollbar is entirely up to you. The SVA man cant criticise it (except for edges) as roll bars arent required for
SVA!...Though the fixing needs to be good if your belts are attached to them!
David
Sera
http://www.motosera.com
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Jonte
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| posted on 8/4/05 at 03:06 PM |
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quote:
Originally posted by colmaccoll
They are coach bolts, do they have a square section under the domed head? like this
That´s right
Click it
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indykid
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| posted on 9/4/05 at 03:41 PM |
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quote:
Originally posted by tim windmill
i,m a yorkshire lad.
do you other yorkshire lads ever meet up?
aye lad, wi do.
its in ackworth though so more accessible to those in west and south yorkshire. we'll be meeting on wednesday, at a pub i can't remember
the name of, on the roundabout.
just search yorkshire meet in the clubs/events section.
tom
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Hellfire
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| posted on 9/4/05 at 04:07 PM |
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quote:
Originally posted by indykid
as for the MK back bracing on yours hellfire, i cant see how it is any better than a standard bar, as there is no real support down to the chassis, as
it is not a straight run to the base of the back panel.
It has to be at least slightly better than a standard bar as it will transfer loads down the rear bracing into the chassis to an extent. Better still
would be the rear stays diagonally to the corners of the chassis but hey........ whos gonna roll it to find out
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Marshy7771
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| posted on 11/4/05 at 11:26 AM |
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Its fitted. Thanks for all the advice.
In the end we tapped the rollbar and the outside holes and fitted M10 bolts, with M8 bolys straight through the box section on the inside holes. I
know the bolts are different sizes but its matches on both sides and is as solid as a rock.
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