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Alternator rotation

Discussion in 'The Hokey Ass Message Board' started by Spoon, Jan 6, 2008.

  1. Spoon
    Joined:
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    Location:
    Benbrook, TEXAS

    Spoon Member

    Will an alternator produce voltage reguardless of it's rotational direction?
    If so, how will it's cooling be effected?
  2. Von Rigg Fink
    Joined:
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    Von Rigg Fink Member

    how do you plan on rotating it any other way than it already does?
    No matter where you place it on the front of your engine it will always rotate the same way, unless you plan on twisting your V belt into an 8 shape, or mount it facing your engine..am i right?
  3. dave lewis
    Joined:
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    monterey bay, ca.

    dave lewis
    ALLIANCE MEMBER

    Alternators will charge turning either direction. The fan will normally pull warm air out of the case (clockwize, facing the engine) If you need to mount it backwards on the engine ( clearance issues??) it will work fine. The fan will blow cool air into the case. ( slightly less efficient, but ok.)
    Dave :)
  4. Dirty2
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    Zip City, Texas 75180

    Dirty2 Member

    It dosent care which way it spins. There is oppasite direction fans like for the serpentine belts which turn the alternator and water pump ccw. But I have never had a problem with the std fan.
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  5. Von Rigg Fink
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    Von Rigg Fink Member

    Ok, cool I didnt know that either!. good thing to remember.
  6. DrJ
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    PARADISE! (Long Beach, CA)

    DrJ Member

    Are there marine application reverse rotation alt's for reverse rotation engine$ available with reverse bent fan$?
  7. Von Rigg Fink
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    Von Rigg Fink Member

    The marine application issue would be a good source..(Expensive ) but good source..The marine Alt's are approved for that application so they are to provide a low risk of ignition in the case of fumes in the engine compartment, so they get a few bucks more for them..kinda like the Marine Carb. issue.
  8. Spoon
    Joined:
    Sep 18, 2004
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    Location:
    Benbrook, TEXAS

    Spoon Member

    The alts I have came off of different V8s and I'm mounting one on my Flat 6. I noticed the fins were opposite from the ones on the generator that came off of the Flathead 6 cyl. Then, I got myself all confused as to which direction my V8s turned. I think they both turn counterclock wise from the drivers seat, but I'm not positive. That's how this question popped up.

    Thanks for all of your help.
    Ya'll rock!
  9. langy
    Joined:
    Apr 27, 2006
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    Location:
    Just north of London, England

    langy Member

    If the alternator has been used for any length of time the brushes will have bedded thereselves in and may not like being spun in the other direction at first. Got the shirt :-(
  10. stuart in mn
    Joined:
    Nov 22, 2007
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    Location:
    Minneapolis

    stuart in mn Member

    If I recall correctly, Corvairs had a reverse rotation alternator so if you're talking about a GM alternator you could try to find an alternator fan off one of them.
  11. Gusaroo
    Joined:
    Dec 19, 2006
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    Location:
    Glastonbury CT

    Gusaroo Member

    If your running a serpentine set up, you could potentially be in a situation where the alt may run in reverse... but why would you want a serp set up anyway?
  12. Model A Vette
    Joined:
    Mar 8, 2002
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    995
    Location:
    Central NJ, USA

    Model A Vette Member

    Yes, Corvair alternators turn counterclockwise veiwed from the front. They were used '65-'69. The fans are different and the nuts to hold the pulley and fan on are lock nuts. Clarks Corvair sells billet fans if you feel the need! (www.corvair.com)

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