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Old 02-24-2012, 09:55 PM
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GM CS style alternators?

I need to increase my amp handling due to an electric fan, fuel pump, and other stuff. I bought one of these of of a Cadillac from ebay, but realised that I don't know much about them.
Can they be used for both clockwise and counter clockwise rotation? Putting this on a 70 Pontiac Lemans, and also changing to a home brewed serpentine belt system. I've already gotten the MADElectrical instal kit for the wiring for this.
I specifically do not want nor will use a one wire type. Just don't like them. Just in case anyone wants to bring those up.

Thanks,
Russ

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Old 02-24-2012, 10:05 PM
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I just replaced the CS 130 in my 59 with a CS130D.

I got bit by the alternator fan one too many time with the regular CS130.

This is what I will say

CS130---world of difference over the old 12SI alternators
Has the power to run everything on my 59 but did not really maintain 14+ volts at cruise with the AC and electric fans running (did keep the battery charged up tho).

CS130D (internal fan) I just put on the 59 (and also my 66 elky) seems to be able to keep up with high loads at idle.
After changing the alternator, I started the car, and immediately turned on:
Headlights---high beams
Heater fan on high
Both engine cooling fans
Stereo
(car has two electric fuel pumps)
And even started running the windows up and down.

On a cold car still trying to hit on all 8 cylinders, volts never dropped below 13.8 at idle.
Turned everything off and had a steady 14.4.

Yep---the CS alternators are up to the task
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Old 02-25-2012, 04:21 AM
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Not sure why you'd want to run it backwards and really don't know if it will work..... here's a few dia and should get you on the right track.
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Old 02-25-2012, 06:03 AM
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The CS 130d is a very good high output alternator and it will work backwards. The only problem I see is the cooling fan. If you look at the two fans, you can see one is a centrifugal type and the other is a squirrel cage type. They are designed to move a lot of air and I don't know if they work as well backwards. It might do fine, but 100 amps is a lot of heat and those fans are one reason for the reliability of the CS 130d. The voltage regulator has a temp monitoring circuit and will stop charging if it overheats. I also do not like one wire alternators, I want one that monitors the vehicle load, but that's just my preference. As an added bonus, you can run a tachometer off the "P" terminal, diesels are done this way.
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Old 02-25-2012, 08:05 AM
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With most serpentine systems the water pump runs backwards (compared to traditional belts), but the alternator turns in the same direction. I don't think I've seen one that changes the rotation direction of the alternator.

Bruce
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Old 02-27-2012, 07:09 PM
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Thanks.

I probably am just over thinking this, but at the price of these things I don't want to kill any.
Just wanted to make sure that rotating it in the opposite direction (if this setup requires it) wouldn't fry the electronics in it. The cooling fan on it I can deal with I think. If not I'll be going to plan B. Once I can find out what that would be that is.

Russ
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Old 02-28-2012, 07:00 PM
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Quote:
Originally Posted by russ69coupe
Thanks.

I probably am just over thinking this, but at the price of these things I don't want to kill any.
Just wanted to make sure that rotating it in the opposite direction (if this setup requires it) wouldn't fry the electronics in it. The cooling fan on it I can deal with I think. If not I'll be going to plan B. Once I can find out what that would be that is.

Russ
Electrically, the alternator works the same regardless of direction of rotation.

As said, the fan function is the only real concern. The alternator cooling fan is designed to pull air into the back of the alternator to cool the diodes/heat sink located there. Then the air is exhausted out the front. Spinning the fan backwards will pull air (less efficiently) in the front and push it back through the alternator until it reaches the diodes/heat sink then exhausts out the back. So IF the fan is directional, it will be more efficient in one direction than the other.

Whether or not the loss of the fan's efficiency is a matter for concern will depend on how hard the alternator is worked, and things like the underhood temperature and air flow around the alternator in the vehicle it's in now.

My gut feeling is there will not be an issue unless there are higher than normal temps under hood and/or the alternator duty cycle is extreme. But if this were to be a concern, the fan can be swapped for one that gives the correct air flow or one that's "bidirectional" can be used instead. A bi-fan will have basically straight blades radiating out and won't have any fan blade bias as to direction like a directional fan has.
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