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Old 10-09-2003, 02:29 PM   #1
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Question Alternator spin direction? Does it really matter?

An alternator produces AC voltage. So, AC voltage is produced by spinning in any direction right? Does it matter which direction the alternator spins? I am assuming it doesn't matter.
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Old 10-09-2003, 03:36 PM   #2
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I dunno about that but you also have to have cooling vanes spinning the right way for cooling...
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Old 10-09-2003, 04:18 PM   #3
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True, I didn't think about that Ray.
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Old 10-09-2003, 09:41 PM   #4
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Re: Alternator spin direction? Does it really matter?

Quote:
Originally posted by exoticcarsgonewild
An alternator produces AC voltage. So, AC voltage is produced by spinning in any direction right? Does it matter which direction the alternator spins? I am assuming it doesn't matter.

Cars are DC voltage not AC voltage.

And yeah you need to spin the alt in the direction of the cooling fins.
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Old 10-09-2003, 09:48 PM   #5
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Re: Re: Alternator spin direction? Does it really matter?

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Cars are DC voltage not AC voltage.
yes but alternators produce AC current which is converted to DC. A few engines have DC generators but they aren't widely used because alternators are capable of greater efficiency.

still not sure if there is a "right" direction for electricity generation though. you can put a voltmeter on it and see if it produces the same polarity of current when spun either way by hand...
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Old 10-09-2003, 10:17 PM   #6
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The twin diode bridge use to make DC will still make a positive DC if the AC source is reversed. This is full wave (180 degree) rectification. A negative voltage could not be produced unless the source winding was center tapped and used as a "zero " reference.

Hope this helps.
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Old 10-10-2003, 09:54 AM   #7
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It will work either direction, but cooling is designed for the stock rotation for best cooling. Won't cool very well in reverse rotation.
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Old 10-12-2003, 07:32 PM   #8
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Either way for AC.
Some aftermarket supercharger kits mount the alternator backwards. I wonder if they burn out quicker.
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