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    Adding an alternator
    #1
    Telescope Master
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    Does anyone who's added an alternator to a bike engine powered car know of any compatibility issues with the stock charging system? In other words, can I just ad the feed/output from the added unit to the existing battery? Or will I have to add another battery separate from the bike system?
    If the best things in life are free why are there lotteries?
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    Re: Adding an alternator
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    Senior Member JD66's Avatar
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    When I added an automotive alternator to my hayabusa, I didn't have any issues. I ran it both with and without the stock stator, everything charged fine.

    If you can, drive the alternator off the crankshaft. It's better than running off the gearbox RPM input shaft since the alternator will charge even when stopped.
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    Re: Adding an alternator
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    Keeper of the Asylum K-fab's Avatar
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    Same here. I just piggybacked it into the electrical system.
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    Re: Adding an alternator
    #4
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    I would use the 1 wire GM alternator direct to battery.
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    Re: Adding an alternator
    #5
    Telescope Master
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    Quote Originally Posted by JD66 View Post
    When I added an automotive alternator to my hayabusa, I didn't have any issues. I ran it both with and without the stock stator, everything charged fine.

    If you can, drive the alternator off the crankshaft. It's better than running off the gearbox RPM input shaft since the alternator will charge even when stopped.
    Hey JD, Do you drive the alternator under/overdrive or 1 to 1? Any concern about max RPM for the mini units?
    If the best things in life are free why are there lotteries?
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    Re: Adding an alternator
    #6
    Keeper of the Asylum K-fab's Avatar
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    From what I understand you can spin them upwards of 14K - should be no issues.
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    Re: Adding an alternator
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    Depends on environment, I don't get much life out of automotive alternators unless I keep them down under 12krpm bearings die or diode packs melt eventually - but my engine bay is compact and hot, and there's plenty of dirt, water, etc, around, and it spends 90% of it's life at high rpms.
    Last edited by PhillipM; 04-23-2016 at 09:19 AM.
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    Re: Adding an alternator
    #8
    Millenium Member plkracer's Avatar
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    The denso units can turn 20k before they fly apart.

    I bought a powermaster 8172, they are a true one wire now, and produce 30 amps at 2400 rpm at the alternator, with a peak of 55.

    Im running mine from the rpm output shaft, and i should get a benefit from the alt above 12mph.
    Proud owner of a two seat pucker-mobile. Funco inspired mini buggy powered by a Busa. Giving out free rides to anyone brave enough.
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    Re: Adding an alternator
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    Yeah, but the 'fly apart' speed is far above the 'worn out and not working after 10 minutes' speed
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    Re: Adding an alternator
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    Millenium Member plkracer's Avatar
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    Powermaster rates them at 20k, not sure how long they will last at that speed though. Im sure it will take quite a bit more to blow it up.

    Most cars run them close to 3:1, and driving 200k at 2500 rpm on the engine, seems like they can take some serious revolutions.
    Proud owner of a two seat pucker-mobile. Funco inspired mini buggy powered by a Busa. Giving out free rides to anyone brave enough.
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