This may be a dumb question but here goes anyway. When building a new car I like to use P-clamps with the rubber shielding to mount my brake lines. I usually weld small tab's on the frame for the mounting points. Well due to poor planning and getting in a hurry, I did not put enough mounting tabs on my frame to secure the brake lines. Since the frame is already painted I really don't want to weld on the frame. What I would like to do at this point is to just drill and tap 10-32 holes in about four places in the chassis for my mounting points. What I need to know is this going to present a problem with tech. This is a all tube frame for a streamliner and the threaded holes will be in the lower portion of a couple vertical upright bars in the main driver area. Not in the actual roll cage. Any info will be a great help.....JerryO
Ooooh,
please do not drill structure for simple attachments. I can't speak for the tech inspectors in LSR, but we didn't allow this in motorcycle road racing (no roll cages!) on structural elements. There are MUCH simpler and high quality ways to do this without the induced stress of a tapped hole:
Tubing and plumbing parallel: wrap one ty-wrap around both and before you tighten it wrap a second one between the frame and the plumbing.
Tubing and plumbing at right angles: wrap one ty-wrap around the tube and one around the plumbing with the ty-wraps interwoven.
Any angle: use two "p" clamps, one on the tubing and one on the plumbing with a common bolt through both.