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Old 11-22-2008, 10:57 PM
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Changing GM Alternators

Now that the 671 is installed I need a smaller alternator.....no space. Can I use one off my 94 cavalier???? If so how do I hook up the connectors???????? Any help would be appreciated............

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Old 11-23-2008, 04:43 AM
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they have brackets you can use to hook the alt down off the crank pulley.also once in HOTROD magazine many moons ago there was a how to for hooking the alt. down near the drive shaft and running it off that, but i can't see that working when the car stops moving. Maybe an eletric motor form like an eletric water pump set up, that might turn the atl fast enuff.
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Old 11-23-2008, 07:43 AM
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basic preface:
90%+? of all alt's work the same, just the "packaging" changes to attain a given amps output based on the rotor and armature demensions and windings

so yes you can use the Cav ("SI" model?) alt but do be aware that many of the imports alt's are even way smaller with more amps capability....

what you must check carefully for is that the alt pulley diameter's are exactly the same or swap the pulleys....
the basic reason is that most alt's are set up roughly in a 3/1 alt pulley rev's ratio to the crank pulley rev's so that 5,000 motor rpms is 15,000 alt rpms.....
it only takes a wee bit smaller alt pulley to raise that speed to 18,000 alt rpms at 5,000!!!!!
and if the alt pulley diameter is to big it won't spin fast enough to put out enough amps at idle rpms (alt amps output does ramp up with rpms)

for future reference:
there are tons of excellent spec's and diagrams and details on the Autozone site....
here's the illustration and diagram for the Cav alt:
http://www.autozone.com/az/cds/en_us...rInfoPages.htm

pretty likely that who ever sold you the blower has a alt mount bracket for that model blower and your specific (????) motor

post more details and likely someone can answer with a best possible bracket/alt/blower/pulley choice combo
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Old 11-23-2008, 08:57 AM
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If you buy and after market CS case stlye, it is small and only takes one wire to run.
Dave
Dave's Hot Rod Shop KC Mo
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Old 11-23-2008, 09:01 AM
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It would help to have more detail on what you have.

If you are replacing a GM SI series alternator (with a BAT connection and two-wire plug), there are a lot of options, but probably none of them have a much smaller case. The newer GM alternators (CS series, etc.) are physically smaller, and there are plugs to adapt to SI wiring. Some of the imports (Nippondenso, etc.) do have smaller cases, but probably do not mount the same.

Bruce
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Old 11-23-2008, 09:11 AM
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binder,
do confirm that the (very wow) truck in your picture gallery is the motor in question....

http://www.hotrodders.com/gallery/sh...p?ppuser=10956

way to often on this board that's not the case,,,,the question is asked actually for some totally different other vehicle project....
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Old 11-24-2008, 02:50 PM
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Changing GM Alternators

Thanks to all of you for your input! thats my motor....1969 427 with LS6 square port heads. Had been running a made in USA chrome alt. with a deep grove pulley. Now I have to move it back farther to line up with the pulley on the crank & there lies the problem!!!!!!!!! I here Denco alts from Super Coupes are smaller. A buddies gonna check for depth. Will post pics as I go along....Marty
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