PDA

View Full Version : moly or mild steel?

Xrated1
08-05-2008, 08:09 PM
I want a faster car, looking at moving up from a backhalf camaro to a full chassis car. I know to get a 25.1e cert it must be c-moly, not ready to go that fast yet and there are a number of 8.50 and 7.50 mild steel cars for sale. Would appreciate any input anyone has c-moly vs. mild steel.
zipper06
08-05-2008, 09:45 PM
You said it yourself, not ready to go that fast, Moly cost 1/3 more in material and must be welded with TIG, VS MS Mig welded extra cost a bunch.

zip.
curtisreed
08-06-2008, 03:58 AM
Moly usually has a better resale value though.

Curtis
promodjohn
08-07-2008, 08:29 AM
Be careful there is some real junk out there forsale.I spent a year and a half looking at numerious cars and ended up buying a moly rolling chassis from a well known reputable builder.I like you did not need a double framerail moly car because Idon't intend to go that fast right now because of the exspence.However you never know what the future is going to bring and its going to be nice knowing I can throw anything at it and the car will be able to handle it.The car is so square its incredible,the welds look like rolls of new dimes.
Now to get back to you, make sure the car you are looking at is on a level surface.Take a tape measure with you and measure the chassis from front to back and side to side.Pay close attention to shock adjustments there should not be a great difference in them.Also 4 link adjustment should not have a great difference from one side to the other.Don't forget no powder coat.I seen one car that had the welds bondoed.Being confident in your car is worth its weight in gold.
john858
08-08-2008, 10:00 AM
imo if you are go to spend the money on a tube car i would go ahead & buy a moly car and be done. good luck
suicidebomb
08-08-2008, 06:04 PM
I like mild steel because if I need to add something I can MIG weld it on, I can't do that with a moly. I don't own a TIG so I"d have to haul it to someone, it's a convenience to me.
CNDRACER25
08-12-2008, 01:17 PM
You said it yourself, not ready to go that fast, Moly cost 1/3 more in material and must be welded with TIG, VS MS Mig welded extra cost a bunch.

zip.
THAT IS NOT TRUE YOU DO NOT HAVE TO TIG MOLY YOU CAN MIG IT. IF YOU DON'T BELIEVE ME JUST ASK SOMEONE IN THE WELDING INDUSTRY. IF THEY ARE EXPERIENCED THEY WILL TELL YOU SO
jmarksdragster
08-12-2008, 02:50 PM
The problem rests as most have said, resale value. All things being equal I would prefer a GOOD mild steel car. In an accident it tends to bend a little more before breaking. Easier to LEGALLY weld on as well. A chassis welder for a well known company years ago told me they used a steel rod when welding moly, making the joints less apt to be brittle. You can mig one, just not legal.
Tod74
08-12-2008, 04:02 PM
You can mig weld CM ,but it must be stressed relieved afterward...not sure what the NHRA says about that though.
johnracer
08-13-2008, 02:27 AM
NHRA is very clear about welding cm. The rulebook states that cm must be tig welded....
Tod74
08-13-2008, 04:26 AM
NHRA is very clear about welding cm. The rulebook states that cm must be tig welded....

That's what I figured...
olds48
08-18-2008, 02:18 PM
You said it yourself, not ready to go that fast, Moly cost 1/3 more in material and must be welded with TIG, VS MS Mig welded extra cost a bunch.

zip.
THAT IS NOT TRUE YOU DO NOT HAVE TO TIG MOLY YOU CAN MIG IT. IF YOU DON'T BELIEVE ME JUST ASK SOMEONE IN THE WELDING INDUSTRY. IF THEY ARE EXPERIENCED THEY WILL TELL YOU SO

CNDRACER,you are right.NHRA just won't allow it.And CM is not all that much lighter.No doubt that it is,but it doesn't weigh 1/3 of MS.like some people tend to think.Steel is steel and it weighs what steel weighs...peroid.Now,CM is stronger and lets you run a thinner wall thickness,that is where the weight savings comes in,less steel.MS tubing is what 0.130,and CM is 0.080 (???could be wrong) a difference of 0.050 wall thickness.That reduces the weight BY about a third,not down TO a third
zipper06
08-18-2008, 06:50 PM
That's what i was going to say but 3 or 4 guys beat me too it, Ofcourse you can mig CM, but it's not certifiable by NHRA or IHRA, the 2 main sanctioning bodys. You can stick weld it also by useing nirod. But it's not legal for certification.
Another factor comes into play also, a MS chassis cannot be certified below 7.50 no matter how many bars you put in/on the chassis.


Zip.