Roll Bar Size (ernie macdaniel)

[Boost231]

anyone know the thinkness of the bar? is it 1-3/4"x.134" wall mild steel?

most all bars in the buicks are 1-3/4 correct. i want to buy a mount for it and wondering what size it is.

 

[pacecarta]

roll bars by nhra specs should be 1 3/4 (except for the rear cross bar ),
roll cages should be constructed of 1 5/8 ,
whats in yours i cant say and i doubt anyone else could , i suggest you measure the bar you plan to mount to

 

[Boost231]

i agree. just wasnt sure and figured i would post since the car is 500 miles away

 

[WHITE T]

I had some pieces from Ernie all of it was 1 3/4

HTH

 

[gnxtc2]

1 3/4" = mild steel
1 5/8" = chromoly

I had a Ernie McDaniel roll bar, it was 1 3/4" and in mild steel.

Billy T.
gnxtc2@aol.com

 

[pacecarta]

1 3/4" = mild steel
1 5/8" = chromoly

not true
a roll bar must be 1 3/4" minimum but can be mild or chromoly which will have the same outside dimension , what differs is the wall thickness , chromoly doesnt need to be as thick walled as mild so theres a weight advantage in going to CM but it costs more

roll cage can be 1 5/8" but thats a minimum and wall thickness would be thicker if done in mild steel vs CM

i see op posted wall thickness ...but if your mounting 'onto' a bar the bars are measured outside

 

[buizila]

I know this is a little of topic,but I look at it this way. Sometimes it's good to go with the minimum and least expensive,but when it comes to safety that's one area U shouldn't chince out on. If U plan on running 11s why not build it for running 8s. Force and inertia don't care how fast ur going so why take the chance IMO.

 

[Sam Colalillo]

2009 NHRA rule for full bodied car

Roll Bar 11.49 to 10.00
Main hoop, side door bars, and rear bars:
1 3/4 O.D. x .118 wal thicknes mild steel tubing
1 3/4 O.D. x .083 wal thicknes chromoly tubing

Side to side bar which the seat belt shoulder straps mount to:
1 1/4 O.D. x .118 wal thicknes mild steel tubing
1 1/4 O.D. x .065 wal thicknes chromoly tubing


STD. Roll Cage 9.99 to 8.49
Main hoop, halo, side door bars, and rear bars:
1 5/8 O.D. x .118 wal thicknes mild steel tubing
1 5/8 O.D. x .083 wal thicknes chromoly tubing

When an X configuration is used instead of 1 door bar:
1 1/2 O.D. x .118 wal thicknes mild steel tubing
1 1/2 O.D. x .083 wal thicknes chromoly tubing

Side to side bar which the seat belt shoulder straps mount to:
1 1/4 O.D. x .118 wal thicknes mild steel tubing
1 1/4 O.D. x .065 wal thicknes chromoly tubing

 

[SS_Sean]

As you can see, you have to be very careful about asking questions on how to construct roll bar/cages here. You'll get different opinions, and some are incorrect. Always consult a reputable chassis builder or your local NHRA chassis inspector.