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 Bosch alternator
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Yetanother96
V4 Fan

United Kingdom
175 Posts

Posted - 03 Sep 2016 :  20:00:34 Show Profile Reply with Quote
I found an alternator in my garage today that I think I purchased to fit on my first 96V4. It's rated at 70A. I'm now planning to fit it to my 96 project as it will give me more power output should I need it, plus it will simplify the wiring.
I think I took this off a Saab 900.
My question is, the alternator is Bosch 0120 489 310 311 K1 -14V28 /70A
It is fitted with a twin pulley which has a slightly smaller diameter than the original pulley. Should I swap the pulley for the original larger diameter one, or will this give me a reduced output. Or as I assume the 900 would rev even faster can I safely leave it the same diameter. I don't want it to be over revved. Has anyone else here done this conversion?

Edited by - Yetanother96 on 04 Sep 2016 07:20:05

Woody
V4 Guru

United Kingdom
2373 Posts

Posted - 04 Sep 2016 :  11:20:23 Show Profile Reply with Quote
Go for the larger pulley if you can undo the nut that is.
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beardydave
Starting Member

46 Posts

Posted - 04 Sep 2016 :  11:45:00 Show Profile Reply with Quote
The idle speed is going to be about the same between a 900 and a 96, but the key dynamic is the ratios between the crank pulley and the other pulleys on the system. You need to keep the ratios about the same as they were on the original car to keep the output at idle right, this is where alternators have the hardest time (I can see the revs dip on my 9-3 when the AC fan kicks in).

If the ratios are kept similar, both cars have similar rev ranges so everything else should work.
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melle
V4 Guru

United Kingdom
2253 Posts

Posted - 04 Sep 2016 :  20:03:08 Show Profile Visit melle's Homepage Reply with Quote
You also need to swap the "fan" as the alternator on the 900 turns clockwise whilst it spins counter clockwise on the 96 (facing the pulleys on both that is).

www.saabv4.com
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Yetanother96
V4 Fan

United Kingdom
175 Posts

Posted - 04 Sep 2016 :  22:09:23 Show Profile Reply with Quote
Many thanks gentlemen for your sage advice. Good call on the fan , Melle, I hadn't even considered this. See my note and picture on my alternator in my project forum.
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