anyone have tech specs (bends, lengths, base measurements) for a 4pt or 6 pt roll cage in an eg? i think someone should archive a list for different cars and different cage specs (4pt, 6pt, 8pt, 10pt) and put it as a sticky. of course everything should be 1.75" and 120 wall chrom moly.

 

thats not exactly how it works...
as far as scca goes your not allowed to run a chromoly cage unless you get it done by somone certified and it could be 1.5 mild dom tubing or 1.75 in .120 or .095 depending on the weight

 

still, at least guidelines for people to go off of. and i didnt know it had to be done by someone certified, i thought it just had to be certified by someone once it was all welded up..

 

bump

 

ok guess im the only one interested in this

 

You are correct it only needs to be certified after the cage is built, not built by someone certified. SCCA allows the use of 4130 but it must be heli-arc welded (TIG). Do a google search, determine what class you want to run and go from there.

 

i was planning to use 120 wall chrom moly 1.75" id and mid the bases to the car and then tig the piping to the bases and the piping together. yea i assumed that you got your car certified at an event when it gets the tech inspection.
im not doing mine for to run class events tho, its mainly for my own protection and to have the ability to be able to run at the track should i want to. i have a friend thats designed a handful of certified tube chassis cars but i didnt want to bother him as far as taking measurements and bend angles but i may end up having to do so due to the lack of responses. just thought it would be helpful to many to be able to at least have a basemap to go off of when plotting their roll cage.

 

no need to go so thick on the tubing if you're using chromoly. .083 is all thats required. .120 is some thick, heavy ****!


<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zeimbo &raquo;</TD></TR><TR><TD CLASS="quote">anyone have tech specs (bends, lengths, base measurements) for a 4pt or 6 pt roll cage in an eg? i think someone should archive a list for different cars and different cage specs (4pt, 6pt, 8pt, 10pt) and put it as a sticky. of course everything should be 1.75" and 120 wall chrom moly. </TD></TR></TABLE>

what kinda specs are you looking for? i could give you measurements for a main hoop but can you make it using my measurements? what CLR would you be using?

 

youre right, the .118 wall is for mild steel which i was considering at first.

yea pretty much hoop specs and for the rear bend radius' down to the shock towers- everything as far as lengths, angles, and clearances.
why couldnt i make it using your measurements? i have access to a pipe bender and i have mild experience in fabrication.

CLR as in clearance? CLR as in centerline radius? if you mean clearance, id like to see some pics of yours and see how it looks if thats possible. i want everything as close as i can get it because id like the option to throw the backseat in if i wanted to.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zeimbo &raquo;</TD></TR><TR><TD CLASS="quote">yea pretty much hoop specs and for the rear bend radius' down to the shock towers- everything as far as lengths, angles, and clearances.
why couldnt i make it using your measurements? i have access to a pipe bender and i have mild experience in fabrication.
</TD></TR></TABLE>

the only bars i have notes for are main hoops and halo's... i do everything else by eye. if you have fabrication experience then just try to do it! envision what u want it to look like first though.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by zeimbo &raquo;</TD></TR><TR><TD CLASS="quote">
yea pretty much hoop CLR as in clearance? CLR as in centerline radius? if you mean clearance, id like to see some pics of yours and see how it looks if thats possible. i want everything as close as i can get it because id like the option to throw the backseat in if i wanted to.</TD></TR></TABLE>

clr as in centerline radius...

yea i got a couple pics... 2 many! lol... do a search on my name.

https://honda-tech.com/zerothread?id=1944083


https://honda-tech.com/zerothread?id=1868562


https://honda-tech.com/zerothread?id=2106317

 

thats illin'

 

i know exactly how i want it to look, was just kinda hoping someone had a "basemap" for me to go off of and then i could tweak their numbers to fit my liking.
my roll cage is gonna look something like that first pic with the hatch except im gonna move the crossbar down right above the center hump in the floor and i want the 2 bars going to the shock towers to sit higher and have enough of a bend radius to clear back seats.
very nice work tho, im guessing you do this for a living or at least sidejobs?

 

If you are going to try and retain the rear seats, then please don't put anyone back there, thats just asking for trouble. Also moving the cross bar down to the hump in the floor will not due as much good for you. It's normally mid height for a reason. It acts as a harness bar, and it also acts as a seat brace... not to mention, it helps to support the main hoop in the event of being t-boned as well as gives you a place for a camera mount.

If the car is a drag car I believe you will be fine with having bents in your rear hoop supports, however if you plan on racing scca and or nasa I believe the rear downward hoop supports have to be straight tube.

Just somethings to think about.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bigTom &raquo;</TD></TR><TR><TD CLASS="quote">no need to go so thick on the tubing if you're using chromoly. .083 is all thats required. .120 is some thick, heavy ****!
</TD></TR></TABLE>

For NHRA that is true. For SCCA and NASA that wouldn't be the case. They just recently changed the rules to where you need the same wall thickness for mild steel and chromoly. Their rules also have wall thickness requirements for different weight levels.

To the OP, read the rules for the sanctioning body you want to run in. Measure 58 times, cut/bend once.

I use one of these to find the angle I need -



and I use a JD2 Model 3 Hydraulic bender to bend it up.


Modified by david@didrace.com at 4:27 PM 11/17/2007

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bigTom &raquo;</TD></TR><TR><TD CLASS="quote">

the only bars i have notes for are main hoops and halo's... i do everything else by eye. if you have fabrication experience then just try to do it! envision what u want it to look like first though.

clr as in centerline radius...

yea i got a couple pics... 2 many! lol... do a search on my name.

https://honda-tech.com/zerothread?id=1944083


https://honda-tech.com/zerothread?id=1868562


https://honda-tech.com/zerothread?id=2106317
</TD></TR></TABLE>

 

I'm also looking into building my own cage but it is for a DD so i dont want a full cage. I was thinking just a 4 point at first but was wondering what you think of this for a DD:



I hope you dont mind me using your picture NRGTech

It would make getting in and out of the car alot easier, but should i just stick to a 4 point?


Modified by hybrid2007 at 8:25 AM 11/18/2007