does anybody know what the regs are reguarding them as i am about to weld my mounts to the roll bar lower brace
cheers
colin

[Edited on 6/2/08 by cjtheman]

Don't know about the regs but thats how they are done on the Haynes Roadster

They will have to meet the projections rule of not less than 2.5mm rad contactable and the seatbelt mountings rules of sleeving hollow components. Details all in the SVA manual.

And or course Mr SVA man must be satisifed the mountings are strong enough and with the correct marked bolts but that applies wherever they are.

cheers pajsh
do you know if there is min thread that must be used for the eye bolts
also height and distance apart
cheers
colin

11mm or 7/16 is the minimum. 8.8 grade

cheers mole
just need to sort out the height for the lower brace as i havent welded it in yet
cheers
colin

Can't you wrap the harness around the roll bar brace? This is how a large proportion of race and rally cars do it and it's got to be a far better engineering principle! I passed SVA a few years ago like that with my Fury.

thanks lsdweb
that could be an option

In our case, we had put a substantial tapped plate INSIDE the cross brace tube. This was not good enough for Mr SVA man as he couldn't see exactly how the bolts were secured. He made the point that for all he knew we might just have tapped the cross tube. Which I suppose was fair comment.

He insisted that we drill through from front to back and insert tubes tapped along their full length and completely welded around their circumferance front and rear.

He also was not happy with the rear diagonal braces for the main roll over hoop. These were secured by four bolts through a plate that was STITCH welded to the chassis with one inch welds. There was probably 8 to 10 welds (equals a strength of about 8 - 10 tons) which is considerably more weld than the circumferance of weld that now holds the threaded tube into the cross tube!

He insisted that these plates were welded to the chassis along there complete length.

Interestingly, he never once looked to see how the main roll over bar was attached to the chassis. The mounting platform and bolts are covered by upholstery and foam, so for all he knew they could have been secured with chewing gum!

The bottom line is, to read the SVA manual carefully and photograph any "hidden" strength that you might be building into your design.

Drew

Also check the belt manufacturer's website, they'll certainly know how to do it right.

quote:

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Originally posted by lsdweb
Can't you wrap the harness around the roll bar brace? This is how a large proportion of race and rally cars do it and it's got to be a far better engineering principle! I passed SVA a few years ago like that with my Fury.

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here is my roll bar so far
any comments welcome
cheers colin
Rescued attachment roll bar.JPG

sorry forgot to resize
Rescued attachment roll bar 01.JPG