Roll bar / harness mount Question
Bit of a petty one this, but thought I would ask.
In the book, the drawing showing the roll bar construction (pg53) has the harness brackets shown pointing backwards. However, in the photos on Pg123, they are pointing forwards (also a slightly different design). Does it matter which way they point? Cheers Sean |
my own opinion on this is down to personal preference tho i,m sure there might be rules to some degree,
i,m actually fitting the upper harness mounts into the cross brace, actually drilled into the brace & welded top & bottom, this i believe removes any radius/projection concerns. andy |
Andy, what sort of harnesses are you looking at using? Bolt in or clip in??
I like the idea of 6 point harnesses, and can only seem to find them in clip in, which could be a pain come SVA time, so I may have to just use 4 point till post SVA Sean |
now you,ve got me worried :eek:
my harnesses are Willan,s four point which are bolt in for the lap belts but are clip in for the upper mounts, :eek: are you saying that the clip in type are not going to pass IVA ? i,ve not heard that this would cause a fail ??? the upper mounts clip onto the bolts that have a ring on the top which would be welded into my roll bar cross brace. cheers andy |
Don't panic - I'm just not sure how the tester would look upon eye bolts poking out, but then again, the radius is certainly legit.
It just seems it is easier to get covers for the normal type, that bolt on. As for welding the rings into the roll bar, I still intend to use the 7/16 threaded bar from the book, then screw the eye bolt into that. Apparently it's a fail if they can't see the ends of the bolt ie. it must project through the entire bracket I must also say that I have not actually looked at a harness properly yet. I didn't realise that they only clipped in at the top, although it would make sense (I assume the clips are so someone can be extracted) because screwing eye bolts in between seats etc. would be a PITA Sean |
i did mine like this as it removes a radius that has to be covered
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Ash, great pics, what you have done is what i intend doing but maybe didn,t describe it very well :o
would then bolt the "eye" into the bosses that are weled into the cross brace. a pic tells a thousand words , cheers Ash:cool: andy |
So am I right in thinking then, that the brackets as shown in the book would fail IVA/SVA because they are classed as a projection?
Isn't there some rule about things behind you? Sean |
they are fine as book spec but you will have to put edge trim on them to pass the radius test. doing it as shown in the pictures above just means 4 less bits to cover up. it also looks better.
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Sean |
I've also done mine the same way as Ash - great minds and all that!!!
Cheers Adrian |
Once again this forum proves a great resource - i'm just working out where i'll fit the threaded bosses in my rollbar cross bar, pictures/info like this is really helpful.
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What are people’s thoughts on wrapping the harness around the roll bar cross brace?
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1- You could have the harness run over a round tube and go down to a lower anchorage point. This would make the point where it ran over the round tube the 'effective mounting point' for IVA purposes, so would have to be at the minimum height/sufficient strong (same applies if the belts make contact with the seat when done up). 2 - Top harnesses that were just wrapped (not bolted) onto the cross bar, with no other fixing, might be problematic because they could easily slide side-to-side (either when loose, or in a crash). Couldn't find reference of anyone actually taking this setup to IVA... |
It’s option 2 I was going for. With the shoulder straps wrapped directly to the cross bar. Quite tight wrapping can be achieved with little to no sideways movement. I might put a rubber sleeve over the buckle for iva
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You could always use option 1 for IVA and then change how the belts were fitted if you really wanted to (without having to make any structural changes.... |
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That is how I've done it. 2014-08-23_15-51-08 by Voucht sans_nom, sur Flickr 2014-08-23_15-51-28 by Voucht sans_nom, sur Flickr 2014-08-23_15-52-17 by Voucht sans_nom, sur Flickr There was a general consensus that putting the threaded bosses through the cross bar was a very good solution, and there is no need to use the 3mm steel bracket to fit them on the cross bas as explained in the book. I think a lot of builders did the same as me. After, concerning my car, I kept the exact transversal position of the threaded bosses as explained page 53 of the book (254mm=300mm=254mm). They don't fall directly behind the harness holes of my seat, as I did my roll bar before buying the seats, and I guess every seat model has its own spacing of harness holes. But it is latterly acceptable, as, IIRC, there is a lateral angle tolerance in the regulation (needs to be checked on your IVA manual) Then I bought Sabel harnesses. Harnesses need to be the short strap style or single seater type, as the saloon car type have way too long shoulder straps. Hope that will help :) |
I had hoped to add some pictures of my own setup sooner, unfortunately - my seats are a very tight fit and, having painted my seat subframe, i'm still trying to get them fully aligned again - they really do clear with only a couple of mm, so it's a bit of a painful process getting them in!
I'll get it cracked this weekend, then put up some pics! |
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