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Old 11-21-2009, 08:45 AM
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Need a small alternator - help please

Looking for suggestions on a small alternator. I have this new chrome 60 amp PowerMaster alternator for the deuce but because of its size the only place to mount it is up high.



What I'm looking for is an alternator that is no longer than 5" from the center of the V belt groove to the back end. Saw a Mitsubishi unit at the GoodGuys swap meet yesterday in Scottsdale that looked about that size but have no idea what it might have come off of. Any suggestions?? I want to run it low on the drivers side and I only have 5 1/4" to play with. Any help will be appreciated.

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Old 11-21-2009, 08:50 AM
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Maybe this will help. http://cgi.ebay.com/ebaymotors/ws/eB...d=400055308493 .

Cole
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Old 11-21-2009, 04:50 PM
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I have a John Deere 2520 compact tractor. The altenator small but its only 40 amp.
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Old 11-21-2009, 06:22 PM
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Gonna make a trip the the wrecking yard Monday to scope out different models. Probably be one from an import unless I can find one of the Chevy mini alternators to measure.
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Old 11-21-2009, 06:40 PM
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Just make sure if you use one of the small Denso alternators like the one in the above post you don't hop it up too much amp wise. The racers around where i'm from love them but they run really hot which makes them less reliable. After one or two races they get replaced. And i've heard parts are hard to come by for those.
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Old 11-22-2009, 12:19 AM
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late 80s early 90s TBI alternator will be the smallest, like on my 91 s-10 4.3L dailly driver, but mounting ears are all wrong for using on an older style v-8

not on opposite sides of the alt case, like on the older ones

its 197k miles and doing fine, i dont know about any overheating issue with them, never seen one do that.

never had to replace one either, unlike the old large style alts which go bad all the time..
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Old 11-22-2009, 06:26 AM
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I think the type that your talking about is the cs130 alternator. The mounting points are actually available 3 different ways. The older style is the 10ai and the 12si. I think that's what is in the picture above. The smaller alternator I was refering to is a Denso alternator. Very tiny in comparison. Not originally very high amperage though. When you hop them up amp wise the case is so small it holds in the heat.
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Old 11-22-2009, 06:46 AM
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Not cheap but small have a look here 100 amp

notice the damper diameter and the size of the alternator ..

http://www.summitracing.com/parts/PWM-8-897/
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Old 11-22-2009, 09:52 AM
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Quote:
Originally Posted by redlightning
Below is a 94 chevy cavalier.
That's a CS130. As noted above, there are three different mounting lug configurations. The ones used on the 3800 V6 motors are the same 12:00/6:00 lugs as used on the older 10SI/12SI alternators, making it easy to fit to existing brackets. One thing to watch out for on the CS130 is that you MUST have a ground to the rear frame of the alternator. The factory uses a bracket to a tapped hole in the rear frame, but failing that, run a ground strap. Failure to do so will result in a bad voltage regulator. My ex-wife had a Buick Century that did not have this ground and went through an alternator a year until I found the Service Bulletin that called for the ground strap. Problem solved.
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Old 11-22-2009, 10:08 AM
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Thanks for the help guys.

I'm not limited as much by diameter as I am by front to back length. The small Chevy looks like it may be short enough to fit (with a V groove pulley) so I'll concentrate looking for something similar. Mounting won't be a big problem as I'll have to make a custom mount anyway. It will mount directly below where the current alternator is just in front of the motor mount. I'll probably use the two bolts that hold the motor mount to the engine to mount any fabricated bracket I make.




Amperage also isn't that big a consideration as this deuce won't have all the extras. No A/C, no cosmic stereo, or any of that stuff. Old time (early '60s style hot rod) so 60 amps should be sufficient.
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Old 11-22-2009, 10:17 AM
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Most of the CS130s come with serpentine pulleys, but the V-belt pulley from an older GM alternator will swap right on.
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Old 11-22-2009, 11:30 AM
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Quote:
Originally Posted by joe_padavano
Most of the CS130s come with serpentine pulleys, but the V-belt pulley from an older GM alternator will swap right on.
They should. I have a chrome one sitting on a pegboard hook just waiting for an alternator to put it on.
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