Del-a-lum question

[jaybee]

Why is the shell of a Del-a-lum bushing made of aluminum? Is it to create a dissimilar metal situation? Or perhaps the aluminum is less prone to rust which would tear up the delrin?

[Lonnies Performance]

It is lighter than steel, does not rust & it's easier to machine. Steel would offer no strength benefit in this application.

I've run these on my street car for years with no wear issues.

[68Formula]

In addition to corrosion benefits, it's also softer than steel. So probably easier to press-in and less wear between moving parts as the control arm rotates.