DOM vs. Moly

DHR Motorsports · Mar 30, 2009

Why don't people use moly in for their cages??

You can be lighter while keeping the same strength??

Not doggin' on DOM but just curious that with people spending so much money on their rigs now days why not use cromoly.

Just curious as nobody uses DOM in drag racing apps and here are a few shots of my friend Spiro Pappas crashing yesterday in bradenton.

Testament to moly's strength and a well built car as he walked away...

Photos......

http://www.streetlegaltv.com/forum/spiro-pappas-horrible-wreck-nmca-florida-2379.html#post5292

Video.....

http://video.streetlegaltv.com/video_detail.php?mId=8504

nick c · Mar 30, 2009

I used DOM because Pirate told me too. :corn:

CrustyJeep · Mar 30, 2009

Most of us don't have a giant freaking oven in which to normalize our junk after welding.

jeepmauler · Mar 30, 2009

$$$$$

CrustyJeep · Mar 30, 2009

jeepmauler said:
$$$$$

You're damn right giant freaking ovens are expensive

Jaydog · Mar 30, 2009

CrustyJeep said:
You're damn right giant freaking ovens are expensive

I thought you were building a shop :eeek:

DHR Motorsports · Mar 30, 2009

CrustyJeep said:
Most of us don't have a giant freaking oven in which to normalize our junk after welding.

The only drag chassis that do that are the T/F and F/C cars and they are even getting away from that.

It is a fallacy that you HAVE to do that for strength.

Pook · Mar 30, 2009

You still would want the wall thickness in all the rockrash area's IMO.
Definetly could go lighter elser where though.

I'd say its mostly a $ thing.

Boosted · Mar 30, 2009

Ease of welding and cost would be my guess....

Broken Again · Mar 30, 2009

This chit cracks me up.:haha:

DOM is HREW DOM...same stuff only drawn...as long as you are in the 1020 and above carbon range.

And "moly" (chromium-molybdenum) comes as (an example) 4130 DOM.

But for a layman cage DOM(1020) should be strong enough at 80kPSI,,,,the 4130 gets you to 100kPSI. That last bit doesn't merrit the extra cash IMO.

mark · Mar 30, 2009

Going out on a limb here, but part of it might also be the general use.

Race cars are kind of a one-time-use cage. Its there to protect you if all hell breaks loose, and it pretty much a goner at that time. Did its job, now its done. If it deforms a little, or gets tweaked, that's actually OK cause that is absorbing energy and impact that your body is not. In this case, light(er) weight is a good trade off.

A wheelers's rig, they cage is constantly used and abused, and need to come back for more. Thicker, "tougher" and increased durability (toughness is actually a technical turn). More weight is a acceptable trade off vs the little bit of weight savings, especially per the cost.

"DOM" is a "tougher" material than standard HREW, hence it is the preferred choice.

Now, it appears that "chromo" is becoming popular for link material (in heavy wall thickness) not for weight savings, but for the "spring link" properties that can be obtained after the proper heat-treating.

Web-Wheelers opinion with a little bit of engineering background (but its been a while since those classes)
________
Easy Vape Whips

CrustyJeep · Mar 30, 2009

Jaydog said:
I thought you were building a shop :eeek:

Think I should turn it into a giant freaking oven?

Hip · Mar 30, 2009

CrustyJeep said:
Think I should turn it into a giant freaking oven?

then we can all powdercoat our chromo cages...after the anealing process.:redneck:

jeepmauler · Mar 30, 2009

Like I said $$$$$.

In the last chassis I looked at doing some of the push/pull interior bars in .060 cromoly to save weight.....once I saw the price jump:eeek:...I settled on DOM....except where I used Aluminum

Money Mark · Mar 30, 2009

.....and here I am standing on the pipe tubber pooper, wondering WTF is happening.

P.S. If I find out that my next (distant, near future) DOM chassis can't take the abuse I put my current tubber through.......I'm gonna be pissed.:whip:

sarg · Mar 30, 2009

from what I have gathered cromo is not that much stronger unless it is heat treat.

Binder · Mar 30, 2009

DHR Motorsports said:
It is a fallacy that you HAVE to do that for strength.

Where did you get this info? From everything I've read that's mostly incorrect. You get a very small increase in strength untill after heat treat for most alloys.

Bunk1 · Mar 30, 2009

Broken Again said:
But for a layman cage DOM(1020) should be strong enough at 80kPSI,,,,the 4130 gets you to 100kPSI. That last bit doesn't merrit the extra cash IMO.

Most excellent. If you treat it then yer twice as strong as dom, But heat makes stuff move and doing a chassis would be insanely expensive.

I got to wondering a few years ago, Dustin Webster had a new chassis tigged up from chromo but he didnt treat it...was it too expensive to have it treated, or what...got me to thinking why.

Id love to have a unpainted chromo chassis that was treated...Or a ss chassis...that would be blingin

To finish my rambling...wheeling and straight line racing are not similar in any way shape or form.