Big Pasta Looking at the pictures you posted it appears that the tubes in your car are welded seam tubing. If so are you sure that this will cert. Last I knew that style tubing would not certify.
We used DOM tubing. I went back through and didn't find any pics with the welded seam stuff. I think you may be seeing the black marker lines on the tubing. If there is a pic in particular, please let me know. Thanks!
I've always wondered about the tubing in a cage. I used to hang out with some circle burners that ran pure stock and the rules called for at least part of the cage to be DOM. I don't think I knew of a car on the track with DOM tubing and I know most of the kits didn't have it????? What's strange is that MOST drag cars never take a hit and with these guys, it could have happened any night! Almost no car went an entire season without some portion getting cut off and replaced! Is it the price of the DOM or why weren't these kits coming with it? Ken
I need to know the details if someone knows, because if that's the case I need to change it now, while I can! :error:
Looking at the NHRA rules, ERW should work fine. There is nothing that says DOM is required: Look Here Jim
I've done a lot of searchng today and couldn't find anything that said one way or the other. I've never seen it in the rule book, either. I posted the question on another board today and this is the response I got; Here is the link to the thread; http://www.promodifieds.com/forums/showthread.php?s=&postid=32935#post32935 Oh yeah. sorry about the thread-jack! Nice cage! :TU: :grin:
The marker lines must be what I was seeing, looked like welded pipe seams. I thought that roll bars/cages had to be DOM but can't locate it in writing so...............must be ok. By the way the cage looks good!
My mistake! We did end up using some ERW on the cage (2 pieces I think). I checked with a local chassis builder (IHRA certified), and he confirmed that ERW will certify, the difference being (as Alan mentioned) the seam cannot be on the outside of the bend (prone to splitting). Sorry for the confusion!
