Re: moly rollbar vs. steel bar weight difference
[Re: 65_gt_rag_402]
#477890
09/23/09 09:52 PM
09/23/09 09:52 PM
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Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
Leon441
master
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master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
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This question cannot be answered if you want a legal roll bar. There is no 1 3/4" .083" chrome moly tubing. A legal roll bar, not cage, is required to have 1 3/4" main hoop instead of 1 5/8" tube diameter.
If you are blowing off the rules and go with Chrome moly you will save 35 pounds give or take.
Leon
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
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Re: Chromoly roll bar vs. steel bar weight difference
[Re: 65_gt_rag_402]
#477893
09/23/09 11:31 PM
09/23/09 11:31 PM
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Joined: Jan 2003
Posts: 6,142
Melbourne , Australia
LA360
master
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master
Joined: Jan 2003
Posts: 6,142
Melbourne , Australia
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One foot of 1.75" x 0.118" 1020 Steel tubing by 12 inches long weighs 2.07lbs. The same length in 1.625" x 0.083" 4130 N tubing weighs 1.37lbs. There is around 15 feet in a main hoop, give or take a foot or two. Do the math
AL....
Alan Jones
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Re: moly rollbar vs. steel bar weight difference
[Re: Leon441]
#477895
09/24/09 07:08 AM
09/24/09 07:08 AM
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Joined: Feb 2005
Posts: 2,709
NJ central
Scamp408
master
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master
Joined: Feb 2005
Posts: 2,709
NJ central
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Quote:
This question cannot be answered if you want a legal roll bar. There is no 1 3/4" .083" chrome moly tubing. A legal roll bar, not cage, is required to have 1 3/4" main hoop instead of 1 5/8" tube diameter.
If you are blowing off the rules and go with Chrome moly you will save 35 pounds give or take.
Leon
I dont understand no legal moly bar. S/W race sels them and other comp.
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Re: moly rollbar vs. steel bar weight difference
[Re: Leon441]
#477897
09/24/09 09:04 AM
09/24/09 09:04 AM
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Joined: Apr 2006
Posts: 729
Lebanon,IN
mr2performance
super stock
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super stock
Joined: Apr 2006
Posts: 729
Lebanon,IN
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"There is no 1 3/4" .083" chromoly" I have a whole bunch of it in my steel rack. Mike
MR2PERFORMANCE RACE CARS
765 483 9371
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Re: moly rollbar vs. steel bar weight difference
[Re: DrCharles]
#477901
09/24/09 10:12 AM
09/24/09 10:12 AM
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Joined: Jan 2003
Posts: 1,367
Jersey shore
Gary67
super street
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super street
Joined: Jan 2003
Posts: 1,367
Jersey shore
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I believe that's correct..I went 8 point mild steel, mig ,that's what type welder we had. but if you go to the link here Moly and click roll cage faqs you will find it.
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Re: moly rollbar vs. steel bar weight difference
[Re: Gary67]
#477902
09/24/09 10:59 AM
09/24/09 10:59 AM
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Joined: Apr 2005
Posts: 1,880
USA
Ron Silva
top fuel
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top fuel
Joined: Apr 2005
Posts: 1,880
USA
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If you want to save weight go with a Moly bar and make it a 5 pt and use the 1-1/4" cross bar that the rules allow. I had to buy that piece separate since my kit came with a 1-3/4" cross bar.
SRT DEMON ONE SEAT
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Re: moly rollbar vs. steel bar weight difference
[Re: 65_gt_rag_402]
#477903
09/24/09 09:51 PM
09/24/09 09:51 PM
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Joined: Jun 2004
Posts: 334
Wi.
65_gt_rag_402
OP
enthusiast
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OP
enthusiast
Joined: Jun 2004
Posts: 334
Wi.
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That was very interesting ! and helpful . I wish I could do the job myself But I do not have the tig welder or bender. Soooooo. I have a fab shop picked out to do the job. another question ... Can I have a hinge/swing bar installed for the drivers door. or is there other regulations on that issue ? 
65 DART GT RAGTOP mopars "AWESOME" 360 magnum stoker 402 Engine !!!!!!! ROCKS !!!!!!!!!!
11.0's on pump gas .
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Re: moly rollbar vs. steel bar weight difference
[Re: Cab_Burge]
#477905
09/25/09 12:55 AM
09/25/09 12:55 AM
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Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
bigtimeauto
Trophy Winner
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Trophy Winner
Joined: Jun 2007
Posts: 2,646
Plymouth Meeting, PA
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swing out bars will cert to 8.50 as long as they are installed properly.
BB, TT5,Procharged 3300lb Street Car 4.79/154
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My chrome moly roll bar has never been rejected at any race track, NHRA or others wise 
