Jim Meyer Racing has built the last 2 chassis' for me. On his design he used 1" upper & 1.25 lower. But he used mild steel DOM rather than chromoly. I have been told not to use chromoly on the street for building chasiss for a few reasons, but not sure on control arms. This is a little out of my league as to the true reasons not to. That's why I leave it to the people that know when it comes down to stuff like this!
could anyone else chimein on this? I could se the CM not being used since it is stiffer and would be a rougher ride than the mild. Part of the thing is that I am graduating with my under grad in mechanical engineering but none of the professors around here know anything about this kind of a situation. I have the knowledge to do the FEA on it but just don't know what kind of loading I am loking at IE is a 10,000 lb force along the cars axis enough to simulate a pothole pushing the wheel back? what about vertical forces?
well what wall thickness? I was looking at going to a larger diameter tube with a thinner wall maybe.....but the wall thickness is the most important part
well what wall thickness? I was looking at going to a larger diameter tube with a thinner wall maybe.....but the wall thickness is the most important part
Most guys I've talked to don't use 4130N for weldments because they're scared of welding it. Seriously. It's prone to hot cracking and brittle welds, so they just don't bother. Given the prices of steels now days, 4130N isn't that much more expensive than DOM is.
Hey guy
You don't want to use 4130 on the street thin wall or heavy wall .4130 will not last very long on the street because memory compare to mild steel .take a one foot peice and bent it and will not bend back to a netural state many time before failure. compared to mile steel DOM have a good memory that is why NASCAR used it in all their rollcage. because went one those 3800lb car flip over and over the cage is still in one piece bend but not broken (DOM mild steel).A NHRA top fuel car crash the chassis will some time break in half because it weight 1900lb (4130 chromemoly) they are looking for lite-weight.you take 11/2x.085x12 long(4130)has more strengh that 11/2x.125x12 long but the 4130 is lighter but it will work harded and break.Indy car will only use 4130 on chassis parts only and small prop air planes. I hope this help you
Hey guy
You don't want to use 4130 on the street thin wall or heavy wall .4130 will not last very long on the street because memory compare to mild steel .take a one foot peice and bent it and will not bend back to a netural state many time before failure. compared to mile steel DOM have a good memory that is why NASCAR used it in all their rollcage. because went one those 3800lb car flip over and over the cage is still in one piece bend but not broken (DOM mild steel).A NHRA top fuel car crash the chassis will some time break in half because it weight 1900lb (4130 chromemoly) they are looking for lite-weight.you take 11/2x.085x12 long(4130)has more strengh that 11/2x.125x12 long but the 4130 is lighter but it will work harded and break.Indy car will only use 4130 on chassis parts only and small prop air planes. you also have to TIG weld 4130 I hope this help you
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