Tube bars out to front frame on a mopar?
 

I'm installing the roll bar in an a-body mopar and would like to run some bars to the front frame so I don't have the "Flexable Flier" . I need to know what is acceptable, so if anyone has done this, how did you run them? I'll be going to the next divisional race to view what's there.
Mike

Re: Tube bars out to front frame on a mopar?
 

Tubing thru the firewall tying the cage to the front frame is acceptable in Stock .
To make it effective , you need to install a roll cage , not a roll bar .
I try to pass thru the firewall as high as possible ,or practical .
Try to tie the upper inner fender to the bar before angling down to the frame .
Mopars and other unibody cars will need a reinforcement plate welded to the frame rail attachment point for strength .

Re: Tube bars out to front frame on a mopar?
 

Does it have to be one side or the other or can it cut through the inner fender? I want to tie into the shock brace then down to frame. Yes I'm doing the cage, sorta, roll bar was just a general term.
Mike

Re: Tube bars out to front frame on a mopar?
 

On Mopars ,AMC's and Fords It is somewhat easier to do it with two separate tubes to the shock tower ,although I have not had any issues with doing it the way you are describing. .....I've done a few AMC'S that way.
The fragility of A body Mopar's in particular is one reason the change was made to allow the front bars , although more for the protection of the driver .
I've had to straighten a few frames on cars that were bent from wheelstands before doing a new cage and front bars

Re: Tube bars out to front frame on a mopar?
 

When I built my 74 Cuda, I run bars thru the firewall. They went over the shock tower, then turned down to the front sub. Made a plate to weld over the firewall hole and then weld the shock tower to the front bar. We also weld the main hoop to the door post, close as I could get to the latch assembly. After some friends drove the car, they both made comments, about how solid it felt. I drove a buddies SS/JA 68 Dart and had a blast doing so but, I understood what they were telling me afterwards.

Re: Tube bars out to front frame on a mopar?
 

Exactly why I'm doing this, designed to be driven on a flat road, no wheel stands and twisting, thin metal attached whith a few spot welds. Thanks

Re: Tube bars out to front frame on a mopar?
 

I'm planing a knee bar to tie into the door pillars too then off that to the front frame. Thanks for the help and suggestions everyone.
Mike

Re: Tube bars out to front frame on a mopar?
 

2016 rule book prohibits braces from extending in front of the firewall for roll bar in stock. Do they allow them in stock if a cage is installed? Doing an older B-body with a cage now...just wondering.

Phil Vos

Re: Tube bars out to front frame on a mopar?
 

Hi,

This is a quote from the 2016 NHRA Rules Book regarding roll bars in Stock.....



ROLL BARS
Mandatory in AA/S through M/S, AA/SA through M/SA, FS/A
through FS/L, in all convertibles and in any car running 11.49 or
quicker, permitted in slower cars. Front braces may not extend in
front of firewall. Six-point attachments permitted. Roll cage
mandatory in any car running 9.99 or quicker, permitted in slower
vehicles. See General Regulations 4:10, 4:11, 6:3.


It might get through tech but if called on it I think that the Rule Book would prevail....

Just my thoughts because I wouldn't want to give bad info that might get the guy tossed..

bob

Re: Tube bars out to front frame on a mopar?
 

I guess we need to know what they mean by "front braces". Is the "roll cage" just permitted in the driver compartment on 9.99 and quicker with no bars going to the front rails? Very hard to interpret how it's worded. The cars are faster now and the rules are still in the 60's it seems. Without some form of "bracing" some of these unibody cars are dangerously coming close to breaking apart within a year.