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Discussion Starter #1
whats the weight savings between a mild steel vs a moly 10 point cage ive heard its only 20lbs :smt102
 

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a customer of mine had wrecked his mild steel 8.50 certed hatch back it weighed right at 3300 with him in it .. i built him a new hatch with a 25.5 moly deal and it weighed 3035 with him in it id say its lighter ... the new car was a gt old car was an lx only difference
 

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7.86 @ 8800DA 3365lb 275s
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lets compare

10pt cage with say 60 ft. of tube.

1 3/4" X .134 @ 2.313lbs per foot = 138.78lbs
1 5/8" X .134 @ 2.134lbs per foot = 128.04lbs (-10.74lbs)
1 5/8" X .125 @ 2.003lbs per foot = 120.18lbs (-7.86lbs)
1 5/8" X .083 @ 1.367lbs per foot = 82.02lbs (-38.16lbs)

so replacing an 1 5/8" X .134 wall cage with .083 wall tube would save you 46.02lbs
 

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aka Nova Joe
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lets compare

10pt cage with say 60 ft. of tube.

1 3/4" X .134 @ 2.313lbs per foot = 138.78lbs
1 5/8" X .134 @ 2.134lbs per foot = 128.04lbs (-10.74lbs)
1 5/8" X .125 @ 2.003lbs per foot = 120.18lbs (-7.86lbs)
1 5/8" X .083 @ 1.367lbs per foot = 82.02lbs (-38.16lbs)

so replacing an 1 5/8" X .134 wall cage with .083 wall tube would save you 46.02lbs

I use lighter tubing wherever it's legal...Like 1-1/4"x.065 on the backbar, kickers, and the dashbar which is a good savings right there...
 

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7.86 @ 8800DA 3365lb 275s
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4,502 Posts
as do i, but the average car will still have 40-50 ft of 1 5/8" tube.

a-pilars 12'
main hoop 10'
rear bars 10' (safe to say most guy's use 1 5/8" here)
door bars 10'
eyebrow 4'

thats 46' there 1 5/8" X .125 wall = 92.138lbs
with 1 5/8" X .083 = 62.882lbs

dashbar and back bar (10ft)
1 1/4" X .108 = 13.28lbs
1 1/4" X .065 = 8.22lbs

mild steel = 105.418lbs
moly= 71.1lbs (-34.318lbs)

i guess what i'm saying is your gonna save a fair amount with moly over mild but probably not 75lbs but more than 20lbs but for certain not 265lbs.....lol
 
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