Other than the rotating mass, they should perform their tasks identically. Since aluminum is lighter than steel rotating all of them may make a 1/2 hp difference or something.
Almost forgot to mention rust and corrosion problems. I don't know if I'd want to mix steel and aluminum. Steel rusts, but aluminum has a nasty tendancy to corrode to steel causing all kinds of problems.
[This message has been edited by Unit 5302 (edited 10-02-2001).]
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