Quote:
Originally Posted by Motorcitydak
75% of the torsional (twisting) load is handled by the outer 25% of the material in a bar...but still usually a hollow bar has to be slightly larger in OD to equal a slightly smaller solid bar. Perhaps it has to do with the chemistry of the metal?
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Could be, but those numbers I was quoted seem high. According to Speedway Engineering, they test the bars by twisting the bars 5* which he told me equated to 1" of bar lift.
Doug at Global West was the last of the manufacturers that I talked to and he told me he tested the same way.
Another thing about the bars I listed is that the manufacturers dont tell us wall thicknesses for the hollow bars.