[Graham]

Pics to follow

<img src="/forum/images/smilies/968/biggrin.gif" class="smilie" alt="" /> <img src="/forum/images/smilies/968/biggrin.gif" class="smilie" alt="" /> <img src="/forum/images/smilies/968/biggrin.gif" class="smilie" alt="" /> <img src="/forum/images/smilies/968/biggrin.gif" class="smilie" alt="" /> <img src="/forum/images/smilies/968/biggrin.gif" class="smilie" alt="" /> !!!!!



Graham

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[Graham]

I am adding a second diagonal at the back but the harness bar at the bottam will stay.



Graham

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[Dave]

Amazing how much more room for a cage there is with the interior out...



Where will you be mounting the harnesses?

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[Graham]

on the bottom bar at the back (picture 2)



I have had to make many changes to the RS cage design that I wanted due to MSA regs and my height!



But I am still happy with the result



Graham

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[Dave]

Got it. Looks very nice!

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[Graham]

Thanks



Not as nice as a nice RS rep cage would have but at least it is MSA legal and FIA approved if I ever race abroad.



Another plus is that I will fit!



Thats why the roof cross bracing does not go from corner to corner.



Graham

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[Eric_K]

Looks great. Are you going to paint it all white?

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[Graham]

Eric,



Yes all white.



I'm getting there!



It takes ages this race car building.



He's also made it so that I can keep the side panels of the dash (well he should have done but we will have to wait and see!)



Graham

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[Clem]

Hi Graham - looks like a lot of protection!



As I am going through the cage thought process now, can I ask what kind of tubing you used?

Also curious to know where the harnesses attach to the horizontal?



Thanks,

Jim

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[Graham]

I'll find out



I pretty much left it in there hands



Graham

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[Clem]

Thanks - I am trying to weigh the differences between 1.75x.095 and 1.50x.120.

Wondering if there is also a (real) difference in the 1020 DOM vs 1026 DOM.

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[flash]

the 1.75 is a lot tougher to work with, with no real benfefits in strength in this application - most guys use the 1.50

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[Clem]

Thanks Flash. It's interesting, from what I've read the 1.75x.095 should be slightly lighter and stronger than the 1.50x.120.

But, I have heard that it is harder to work with.

I checked out Eric K's page and his is 1.75.

I would prefer to go with the larger diameter since it seems to be the spec promoted by several organizations (eg Grand Am) and the weight of the car plus driver and fuel will probably be over 3300 lbs. So, not light by any means.

I'm also curious to know how much extra space the 1.75 vs the 1.5 will take up in the car. I would think with a proper design the effect would be negligable?



on edit - Does anybody know the specs of a 996 or 997 cup or GT3R/S cage?

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[Eric_K]

Yes, my cage is 1.75x.095 DOM. The larger diameter is harder to bend (which is good for a cage). It is also slightly lighter.

1.5 x .120 = 1.768 lbs. per foot

1.75 x .95 = 1.679 lbs. per foot

I think either would be a good choice. The 1.5 can give you a little extra room but if the cage is tight to the chassis then it is not a big difference. I don't have any complaints with my cage.



A professional, experienced race car fab shop should have all the knowledge to advise you. My advise is to check around your area and find who racers use to do their cages. The cage is something you want to do right and do once.



Eric

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[flash]

the larger tube is slightly lighter, though you generally need more triangulating tubes with the larger tubing



the strength issues become rather moot once you try to bend attach anything, and are really only in linear deflection capacity, so not a real issue, which is why both tubes are specced



the increased bend radius, and more likely change from MIG to TIG welding, is what makes many guys go to the smaller tubing



both tubes are great and i wrestled with that decision myself recently



definitely take your time and consult cage builers who have done this car, and don't chintz - it's a lot more about the welder than the tubing

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[Eric_K]

FWIW, the shop I use tends to add more (not less) triangulation when using the smaller diameter tubing. For example:

   



But Flash is right, the quality of the work is more important than which spec of approved material is chosen.



Eric

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[Clem]

Thanks guys, this is helpful.

I am still in favor of the 1.75 - and Eric I do plan to make it as tight to the chassis as possible, so the quarter inch difference is a very small penalty.

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[flash]

what it looks like there inthat shot, is they used smaller tubing to make the triangulation - that is pretty common - from the builders i've used, they don't need as many triangulation tubes at all if they use the smaller and thicker tubing



a lot of it is getting past the steward - they see more tubes, they bless it easier



one thing for sure - since most guys insist on TIG on .095 wall tubing, the welds are sure prettier

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[Eric_K]

That is a 1.5 cage, with even smaller tubing used for the gusset.

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[flash]

wow - i assumed the larger tubes were over 1.5 - that wouldn't have passed out here, at least not in SCCA - nothing smaller than 1.5 @.120 for anything



we've recently seen a few people get killed out here, and they are consequently a bit nuts about cages and bars

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