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June 1st, 2008, 11:40 PM
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Rollcage bar question
Guys,
I am in the middle of doing a full cage in my car. I was looking at the NHRA book, but couldnt find info in this. On the front bars, the bar that would connect the front bars (by the visors), does this need to be same material size or can it be smaller diameter? I am using 1 5/8 x .125 DOM. I would like to use 1 1/2 x .125 here. I know the dash bar (is not needed) but if used can be smaller, but I did not see anything about the upper bar by the visor. Thx! Rick
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RICK ELAM 1987 TURBO-T (completly apart) 1987 Limited (stock..needs to be taken apart) 1989 Turbo TA (just back together) 12.0 at 124... 60ft is overrated... 
    
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June 2nd, 2008, 04:42 AM
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The halo, hoop, all down bars and swings out are the same size. The crossbar behind the seat is small diameter. My cage is all chromoly.
 Billy T. gnxtc2@aol.com
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June 2nd, 2008, 06:40 AM
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SFI 25.5 Specifies the upper windshield/Halo bar must be 1 5/8" 0.083 for C/M or 1-5/8" 0.118 for mild steel.
The Notes: Vl.3 The primary roof structure (top of cage) may be formed by attaching the upper windshield/Halo Bar to the driver side windshield/roof bar and passenger side windshield/roof bar, or by forming the upper windshield/halo bar into a halo (extending rearward to the main hoop) supported by the driver side windshiel/roof bar and passenger side windshield/roof bar.
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87 gn, Champion heads, 4 billet caps and a girdle. Turbonetics T66 4 bolt with custom 4" downpipe , FAST B/B W/WB02, PTE 210 roller cam, th400 w/trans brake. 525 RWHP @21 psi on a mustang dyno. Current best et 1.465 60',4.176 @83.33 330', 6.455@105.81 1/8 mile. http://www.youtube.com/watch?v=OXNeK7HIYNY In process of SBC turbo build with 88mm Turbo 
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June 2nd, 2008, 09:28 PM
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Thx guys! That is what I needed.
1 5/8's it is! 
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RICK ELAM 1987 TURBO-T (completly apart) 1987 Limited (stock..needs to be taken apart) 1989 Turbo TA (just back together) 12.0 at 124... 60ft is overrated...
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June 3rd, 2008, 11:56 PM
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Rick, you probably will need to gusset the windshield bar, or maybe you plan to do that already?
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Nick Micale 3334 W. Marconi Ave Phoenix, AZ 85053 602-866-9908 Home of the world's fastest stock block Buick! www.arizonaGN.net arizonagn@qwest.net 
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June 4th, 2008, 09:11 AM
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I didn't plan on it.. but it could be done!
I will be able to fully weld around all bars, so I didnt plan to gusset them. Thx guys!!!
__________________
RICK ELAM 1987 TURBO-T (completly apart) 1987 Limited (stock..needs to be taken apart) 1989 Turbo TA (just back together) 12.0 at 124... 60ft is overrated...
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