Oil sucks, wind blows.
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Speaker magnets have their poles end to end not round the perimeter I would be very skeptical as to its efficiency.
I messed with alternators for nearly 12 months and decided it was a waste of time, I even tried re winding them, they need to turn too fast to do anything useful.
Read on here about car alternators even the commercialy modified ones, also the back bearing is normally a bush and wear out quite quickly.
Brian.