speedyxjs
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| posted on 8/2/10 at 12:26 PM |
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Roll bar supports
After my slight hijack (sorry boggle) of this thread yesterday, I need to find
out if i need to add supports to my roll bar and how i might make them. I assume i can fit them to the top chassis rail that goes round the top at the
rear?
Here is a pic of my roll bar as is:
It is bolted on with 6 bolt (3 either side) is that makes any difference.
How long can i resist the temptation to drop a V8 in?
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Marcus
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| posted on 8/2/10 at 12:37 PM |
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The rear hoop on the chassis is not structural, merely a support for the ally rear panel. You really need to go to the bottom rear corners of the
chassis to get any benefit.
Marcus
Because kits are for girls!!
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speedyxjs
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| posted on 8/2/10 at 12:37 PM |
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quote:
Originally posted by Marcus
The rear hoop on the chassis is not structural, merely a support for the ally rear panel. You really need to go to the bottom rear corners of the
chassis to get any benefit.
That could be a problem. My fuel tank is in the way 
How long can i resist the temptation to drop a V8 in?
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steve m
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| posted on 8/2/10 at 12:43 PM |
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caterham dont, goes to the top
as ive got one now
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MikeR
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| posted on 8/2/10 at 12:45 PM |
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drill four holes in your fuel tank - one top and bottom each side. Problem sorted, the braces can now brace the hoop 
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eznfrank
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| posted on 8/2/10 at 12:48 PM |
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I think the main issue as far as IV Ais concerned is if you intend to mount your harnesses to it? That's the only thing I can find reference to
anyway unless someone would care to correct me?
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speedyxjs
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| posted on 8/2/10 at 12:58 PM |
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quote:
Originally posted by eznfrank
I think the main issue as far as IV Ais concerned is if you intend to mount your harnesses to it? That's the only thing I can find reference to
anyway unless someone would care to correct me?
But a roll bar isnt an IVA requirement (at least it wasnt for SVA, cant find anything in the IVA manual), unless they want to be sure it is strong
enough for the seat belt anchorages?
How long can i resist the temptation to drop a V8 in?
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MikeR
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| posted on 8/2/10 at 01:11 PM |
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roll bar isn't needed for IVA - seat belt mounts that are high enough and can take the force in the examiners view are needed.
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blakep82
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| posted on 8/2/10 at 01:13 PM |
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as far as i can tell, the roll hoop isn't a requirement, but makes good sense to have.
going by that, i don't think supports are essential, but without them, the roll hoop is pretty much useless.
have you got a photo of the back of your chassis with no body on it?
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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speedyxjs
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| posted on 8/2/10 at 02:59 PM |
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quote:
Originally posted by blakep82
have you got a photo of the back of your chassis with no body on it?
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Ben_Copeland
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| posted on 8/2/10 at 03:03 PM |
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Contact rgrs he was the one that failed sva for not having supports on his rollbar. Why go to the bother of fitting a rollbar and not bracing it.
Ben
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RAYLEE29
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| posted on 8/2/10 at 03:20 PM |
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Hi,Ive looked through the iva manual and cant find anything about needing a roll bar
the thing is your using it for seat belt mountings so then it has to be considered strong enough so rear bracing may be necesary
just another point do look at the iva manual to ensure the correct placing of the seat belt mounts as i put mine where i thought and then read the
manual and find i have to move mine 10mm
as for a roll bar without supports i guess it depends on how tall it is and how its mounted and what its made of that counts
im sure ive seen cobras with hoops and no braces are these just for looks?
Ray
[Edited on 8/2/10 by RAYLEE29]
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blakep82
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| posted on 8/2/10 at 03:21 PM |
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hmm, can't seem to upload photos to the archive... i've draw on your picture what i think you should do. hang on...
here we go
silver grey is the support, it might get in the way of the fuel tank bar (green), but if you were to cut it, and weld it back onto the hoop support
(may not be accepted by IVA though as if you do roll, the tank will be affected) so the other option is, to re-do the fuel tank bars.
i think your fuel tank bars might be a bit more complicated then they need to be. you could probably get away with just a triangluar bar up as they
already are, and back down again
[Edited on 8/2/10 by blakep82]
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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cd.thomson
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| posted on 8/2/10 at 03:37 PM |
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Dax dont fit roll bar supports.
Craig
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RAYLEE29
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| posted on 8/2/10 at 03:46 PM |
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I believe the quantum extreme doesnt have them either
Ray
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SPYDER
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| posted on 8/2/10 at 03:47 PM |
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quote:
Originally posted by cd.thomson
Dax dont fit roll bar supports.
Neither do Westfield on some of their roll bars.
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blakep82
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| posted on 8/2/10 at 03:50 PM |
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is the roll bars on dax and westfields etc welded in as part of the chassis, rather than bolted on though? i'm 'guessing' (  ) the
roll hoop on these goes all the way from the floor up aqnd over with all other chassis tubes welded to it? i can see how that would work ok.
________________________
IVA manual link http://www.businesslink.gov.uk/bdotg/action/detail?type=RESOURCES&itemId=1081997083
don't write OT on a new thread title, you're creating the topic, everything you write is very much ON topic!
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rb968
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| posted on 8/2/10 at 05:48 PM |
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The westfield I helped build had that simple hoop rollbar. Too low for occupants and no supports. Oh and it was just bolted on.
I am in the same boat as the OP with the same style rollbar (MK). So am also interested if I leave as is for the IVA how hard is it to add a full cage
afterwards?
Rich
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spdpug98
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| posted on 8/2/10 at 06:03 PM |
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Here is a picture of my roll bar supports; you can just see that they drop down either side of the fuel tank. I personally wouldn't drive a car
with a roll hoop that has no supports, as in the event of an accident they are likely to just fold back on themselves (just my opinion)
My Blog: http://spdpug98.wordpress.com/
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