In Reply to: Hold on, UUC makes them (more) posted by BD on October 07, 2000 at 09:39:19:
It seems that the professional race teams "only" use the 4130 steel to eliminate swaybar breakage and metal fatique out at the "ends" of the bars. As far as the torsional (torque or twisting) qualities, there would be very little if any difference between different steels but the swaybar ends apparently do benefit from the swaybar being made from 4130 steel instead of milder graded steel.
Yes, UUC swaybars are made from the aircraft quality 4130 steel. Stillen Racing offers 4130 grade steel swaybars but not for BMW cars. I understand all the Winston Cup, Busch Grand National and the Truck Series cars/trucks use only 4130 grade steel swaybars. Also, the Outlaw and Off-Road "Baja" racing cars use 4130 steel in their swaybars. I found one website that had 4130 steel swaybars for the Cup and GN cars all the way up to 2" diameter! There must have been 50 choices and each swaybar gave the spring rate pounds...that 2" swaybar was for a spring rate of a zillion pounds!
I wouldn't doubt that the BMW Motorsport dedicated race cars use 4130 swaybars too!
Anyway, I found numerous articles as well as a number of suppliers to various race teams that use "only" 4130 steel for their swaybars. This garde is also used for wheel hubs, racing rear-ends like the quick change models, numerous suspension parts like arms and bars, shock and strut tubes, etc...even aircraft landing gears!
It seems to be the steel of choice for the professional race teams when it comes to swaybars!
I just thought I'd share the information with you guys that are into aftermarket swaybars. There are too many "findings" from the search engines on the subject to share so if anyone is interested, you can search and read all about it yourself.
I'm a little confused about the conversation pertaining to the reasons why 4130 steel is not used for sway bars. UUC presently makes sway bars with 4130 chrome moly spring grade steel. They are in (my opinion) the correct sizes of 26mm front and 24mm rears. Am I missing something here? I assume we are talking about the same steel?
Hey Bob, were you eventually getting to the point that 4130 steel is superior material for building sway bars and that UUC now offers them for the masses?
Just wondering? Coincidentally, I was in the market for sway bars and came to the conclusion the Eibachs or the UUC (because of 4130 steel). I have a friend with the UUC bars and he loves them. Even so, he said the rear links gave him fits of problems. So he tossed them and got some rears links from Racing Dynamics and now he is extremely pleased with the whole setup.