Vee_Que;119544 wroteThe 22mm whiteline Volvo bar is a lot more dense then a stock Volvo bar. So it acts like a bigger bar does.
Unless I'm mistaken (and i have a master's degree in mechanical engineering and worked for over 25 years in automotive engineering and design) density of the steel doesn't come into play (in fact it hardly varies across the different steel alloys)...shear modulus and elastic modulus, along with the bar dimensions are the important factors. Unless you're talking a hollow bar which would be less "dense" from a weight vs cross sectional area standpoint. What you'll find if you look at the governing equations is that for a solid bar, the diameter far outweighs any of the steel properties when it comes to stiffness at the bar endpoints. Obviously the steel grade has to be selected appropriately to ensure the bar is working within the elastic range. The equations are quite interesting. Google if you like. There are some simplified calcs available as well as online calculators.