Steel motors and aluminum motors?

Question

i know the MoCo used to have the steel motors, but were having d**n problems with them. now i hear, the aluminum is better, so whats wrong with the old d**n steel motors?????? please answer me???????

Answer 1

Aluminum has better cooling properties, they are lighter, they are more forgiving with heat, Most importantly, aluminum expands and contracts better without the threat of serious stress fractures.

Answer 2

Aluminum dissipates heat better than steel but I never had trouble with my '55 Panhead. Maybe it was colder temps in the 1970's.

Answer 3

in a word, weight.

you can loose 40% of the weight using alluminum vs steel.