need help on metal thickness

[moparcowboy]

Like to us either 2" X 3" or 2" X 4" sq. tubing on my 31 Plymouth coupe build, 134" wheel base, quarter elipic springs out front, 392 Hemi. what thickness of tubing do I need? [

 

[Bonehead]

3/16 minimum, 1/4 would be solid.

 

[rainman]

Agree with BH, but with the Hemi, I would make it, 1/4" with 2x3, or if you use 3/16 go 2x4!! 3/16 2x3 can be a little flimsy without a lot of cross braces!! Hope I said that right!!

 

[Blue Eyed Devil]

Are you sure on that wheelbase? 134" on a '31 Coupe is wayyyy long. That's going to want to flex more (especially with that heavy 392), plus it will take a 10-acre field to turn around. May want to reel it in a bit. Other than that, 3/16 is fine, 1/4 is overkill, but some people like that...

 

[donsrods]

Yep, that wb is waaaaaaaaay long. Besides taking a couple of acres to make a turn, any frame will sag in the center stretched out that far.

Don

 

[rainman]

Dang, I didn't read that whole post, didn't notice the 134" wb!!!

Why so long???

 

[Old Iron]

Dang, I didn't read that whole post, didn't notice the 134" wb!!!

Why so long???

Speed readers

 

[Bonehead]

WB is about the same as my truck. With Q-E front suspension, the frame would stop short of the wheel base.

 

[rainman]

Speed readers

Yep O I, I've got a bad habit of skimming!!

BH you're truck doesn't look that long in the pics!! If I remember right
mines about 110"!!!

 

[moparcowboy]

the QE springs are bout 36" and will set back 18" so far.
Bonehead what do you think of me using 2x3 under body and 2x4 on front drop and back Z?

 

[sgtpontiac]

Thought you took that there

Yep O I, I've got a bad habit of skimming!!

BH you're truck doesn't look that long in the pics!! If I remember right
mines about 110"!!!

Evelyn Wood speed reading course....lol..

 

[patina]

the QE springs are bout 36" and will set back 18" so far.
Bonehead what do you think of me using 2x3 under body and 2x4 on front drop and back Z?

Thats the way i did mine

 

[Bonehead]

the QE springs are bout 36" and will set back 18" so far.
Bonehead what do you think of me using 2x3 under body and 2x4 on front drop and back Z?

You can mix and match, there are no rules.... only guidelines.

 

[ohio_rat]

I have seen people use 1/8 wall, but I wouldnt. I think 3/16 is perfect, strong enough and thick enough to tap.

1/4 is probably over-kill, weighs a lot more and cost more.

I think the biggest issue is how the frame is layed out, built, braced and welded.

 

[oldmanb]

2x4 x 1/8" tubing would be more then enough for this, considering the total weight to power,your not moving a bus here!
You'll get your strenght from the overall material size,(2x4 verse's 2x3) and unless you undercut your welds,all will be fine Brian