Need ?? Chassis inspector for NHRA certification
 

I need some input on the cage I'm doing, just cross bracing tube size (side impact), would like to discuss this. I don't know if these inspectors can be contacted or will answer my questions, but willing to try. Yes, I have a rule book.
Mike

Re: Need ?? Chassis inspector for NHRA certification
 

Any Divisional Tech guy will gladly help answer your chassis questions. Better yet, call someone that does chassis certs. Tell us your concerns and myself or someone else should be able to answer. ( lower kidney bar? )

Re: Need ?? Chassis inspector for NHRA certification
 

Main hoop, vertical corner to corner diagonal, an X. If a side hit, nothing to keep the hoop from moving over with the impact, Imo. Cross seat bar is 1-1/4 ,065 4130, can it be the same size or ?? It's all 4130 now.

Re: Need ?? Chassis inspector for NHRA certification
 

The lower diags that fit under your main hoop cross bar and travel towards the tunnel will be your answer. 1-1/4 x .058" is the min. use .065" if that's what you have.

Re: Need ?? Chassis inspector for NHRA certification
 

That's what I was thinking too, like the lower diagonals. But I want to go to the top corners somehow tying into cross bar. Maybe not needed but sure looks weak in that direction, how strong is 4130? How hard a hit can hoop at the roof take? Could be I'm over thinking this, car maybe will go 10.90 at best. I also want to build this once and be done with it, taking to long now.
Thanks for your input
Mike

Re: Need ?? Chassis inspector for NHRA certification
 

Mike: IMO There is no need for a cross x or diags into the upper corners of the main hoop. (not considering the halo). You could add a x rearward to compliment the two back bars, if it makes you feel better. Moly is a very strong material. Check it yourself, compare bending to mild steel, smash it with a hammer, put a file to it.