Originally Posted by
Dave Severson
Well, if you don't understand why 160 lbs. is important to me on a street car, then you don't understand the cars I build.... The "once upon a time" stories on moly don't scare me in the least. So, your premise is that a MS car would not have broke at the strut mount or what??? How old were the cars, and how many times had they done big wheelies and come down hard??? Or what, it's impossible to have bad welds using a mig welder and Mild steel?? Too hot a range of what??? How long was the weld, was it welded on both sides, had the cars had any x-rays done after incidents??? By the way, who were these guys and when and where did this happen? 99.9% of the time that a weld fails it's because the guy doing the welding goofed!!!! Wrong filler material, wrong heat range, no penetration, whatever. If that's how you weld, then it doesn't matter what the material is, the weld is going to break!!!!!!! It's much easier to blame the material, I guess.
By NHRA rules and SEMA specs, moly is much stronger, which is why a moly car can be 1 5/8" .083 wall but mild steel has to be 1 5/8" .118 wall..... I guess me, Jerry, NHRA, SEMA, and all the guys who build moly cars are just stupid, huh??? Thank you, my cars do not have issues with the welds or the material used because I know what I'm doing and when in doubt I know who to ask..
I've got too many moly cars, parts, and pieces on the road and on the track to go for this once upon a time stuff. Maybe it doesn't work for you, maybe weight savings is not an issue with you. Don't know, don't care. I know what works, I know how to build it. All summer long I watch hundreds of sprint cars going at it on dirt tracks, all moly cars. All the NHRA Pro Classes and a lot of the Sportsman classes are all moly cars. Moly cars, when constructed properly, are lighter and safer---my criteria for my builds on my cars is the same, lighter and safer.... I've seen a whole lot more mild steel cars break welds and have parts failures then I have moly cars.
The only safe bet is to build every structural part of every car as though your life depends on it. If you don't know how to do that using the best (and lightest) materials then you still have a lot of learning to do......