Fireball

iTrader: (21)

THinking of cutting my Mild steel rollbar out and Tig welding a chromemoly one in Just wondering what the weight differential is

Camaroholic

iTrader: (1)

I did some searching in here ~2 days ago on this exact subject, and some threads were mentioning about a 30 lb difference... ~60 lbs for chromemoly, ~90 lbs for steel. Others said ~20 lbs... So, 20-30 seems like a good number. For the cost difference, doesn't seem too bad. I'm going chromemoly / TIG.

-Andrew

OSR 1

we cutt our 6 point steel out and it weighed the same as our 10 point chrome moly both from wolf

DERTY

My 8 point moly weighs about 75 pounds. However I have 3 additional bars in mine, specifically there are two that tie the main hoop to the rear bars and one that spans between the rear bars. I also have the bars that go behind the seats. It's pretty beefy! A full 14 point, including the underhood bars weighs in at 125lbs or so.

promod1955

iTrader: (44)

my wolfe chromemoly 8 point was around 65 lbs

Navy David SS

iTrader: (13)

My 6 point mild-steel wolfe shipping weight was 65lbs.

David

Fireball

iTrader: (21)

wolfe lists MS shipping weight as 80-85 lbs
and CM as 60-65 lbs

looks like a 20 lbs reduction

98TAauto

iTrader: (2)

better do it cause you're gonna need it

how much you wanna sell your cut up one for Im gonna need something by next spring im sure

CHRISPY

I dont know if it is worth all that work but whatever floats your boat



Chris

Fireball

iTrader: (21)

was going to redo it to make it more aesthetic anyhow...

WILWAXU

iTrader: (6)

Fireball and weight reduction in the same post!

Never thought I'd see the day

Brian, I'll be interested to see how Tyson's stuff comes out... I'm going to need a cage sometime soon too.

GeorgeC

I'm really intersted in OSR 1's findings, as I'm about to do the same thing (replace a MS 6-point bar w/ a chromemoly cage).

It's nice to know I may not be adding any additional weight.

OSR 1

both where wolfe products and we used the pads already on the floor and wheel wells

Fireball

iTrader: (21)

well it should be awesome...he has this 10,000 dollar tube bender and notcher coming and already has his 2500 dollar digital TIG welder. And we all know he can weld

Jay Johnson

iTrader: (16)

The rule of thumb is:

Chromoly is 2/3'rds the weight of comparably constructed
mild steel.


Jay Johnson

Fireball

iTrader: (21)

well I've decided to go with the idea. I ordered a 8-point CM weld in bar from S&W Racecars (we only leave the hoop and cross bar unmodified). We have a nice pipebender so I'm going to bend my downbars to match my current bar. For the doorbars I'm going to a true 6-point (vs the 5-point I have now). Going to custom build a set of swingouts (similar to a design sold by chris alston for mild steel).

Once done I'll pull the hoop/downbars out as an assembly (the short downbars I have allow for this) and I'm going to basecoat/clearcoat the whole rollbar pewter which should be pretty durable I think

then we'll final weld the bar in the car and touch up at the bottom of the bars where the welds are

Once done, the bar should look something like this:

smokinHawk

iTrader: (48)

somebody has tellng me that the chomoly doesnt weld well to the steel on the floor boards., says they arne compatible, and that if it does get into a accedent the welds will break.
Any truth to that?

StreetStalkerZ

iTrader: (1)

I was told the same thing by a freind of mine that has done many cages on older cars. He told me to go with the standard paintable tubing and not to get the chromoly because the welds do not bond to the metal flooring and will be very weak along with the chromoly cracking and busting loose from the welding being done to it. He plain and simply told me the added 20lbs from the standard cage was far better than a lightweight chromoly cage that will not hold up on a roll over. Is 20lbs. worth a life? Not mine!

Fireball

iTrader: (21)

1. you aren't supposed to be welding to the flooring. you have a mild steel 1/8" plate welded to the floor. You can bond 4130 (chromemoly) to mild steel if you know how to properly TIG weld them together.

2. Have to be careful not to put too much heat into the weld though because 4130 can become brittle and break...