dude, why dont you go for a car alternator?
it is bigger, but can produce great amount of current on lower revs..
current bike gives 12.3 volts of AC at 1.4k rpm..
car alternator will do the job i suppose.
as cars run on even lower rpm's and need 3-4 times more current.
besides why don't you wind the coil with thinner wire but a lot more number of turns?
it will result in great voltages, but the amps will be very low.
it will do the job regarding a project.
go to any auto electrician and check yourself the voltages at low rpm's.
i bet they will have loads of car alternators in junk which they can sell you dirt cheap.
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Giving a lot to a fiero.
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