2x3 frame thickness question

[draggindrew]

Im planning on building a complete frame chassis car and was wondering what thickness 2x3 tubing would be best to use?

Thanks
-Drew

[MrQuick]

.120 wall is all we use.

[Bryce]

Drew,

Not trying to be a jerk, but if you are asking what thickness to use. maybe you should build your knowledge base on chassis design before you go and start to build one. It takes a lot of planning and engineering skills, not just the abilty to cut and weld.

[Bryce]

.120 wall is all we use.

Agreed, but not all cars need 2x3x.120 and some cars should use some 2x4x.120.

The chassis that I am designing right now will be double tube with 1.75 DOM with .120 wall.

[rustomatic]

I've got a decent amount of 2x3x.120 in my "floor." I used it for outriggers from my 2x2x.120 subframe connectors, and for a pie-cut-welded over-the-tunnel brace that I made (connects the subframe connectors over the tranny hump). It's worked pretty nicely so far, and I've been working the torsional resistance of the car pretty good lately...

[draggindrew]

I know you arent trying to be rude but it did come across that way. I know more than enough on the structural design and engineering behind building a complete chassis. I just wasnt sure if many people were building their frames out of .085 on complete caged frames to save weight but bracing it right.

[astroracer]

On a drag only car .085 Chromemoly is acceptable, but for a street car that will see rough roads, potholes and train tracks you want to go with a heavier wall to carry that load. Saving weight is secondary in my opinion in order to make a safe and worry free road car.
Mark

[Bryce]

Chromoly has a shorter life than a mild steel frame. Chromoly has fatigue issues. A race car is fine to use CM and save some weight but a street car that will see lots of miles should be MS.

[John Wright]

When you're shopping some places may call it out as 11 ga tubing.

[draggindrew]

Thanks for the help I had a feeling I knew the answer to my own question, but I just wanted others opinions to confirm my suspicions.