Alternator upgrade

by builtnotbought on Sat Aug 20, 2016 4:32 pm

I wonder if there is any alternator that is used on modern (90-2000) US cars that can be fitted to old sbc block brackets and wiring?
My stock alternator on idle when 2 air compressors are running goes down from 14v to 12v according to gauge.
May be somebody had any experience in upgrading stock alternator to more powerful unit.
What output does stock alternator have (in Amps)? I don't have any marks on mine. Modern cars have from about 140A.
Thank you

by Joe73 on Sat Aug 20, 2016 5:20 pm

Loads of upgrades for our altenators. Its done all the time. Just google "chevy alternator si wiring harness". Plenty info out there.

by builtnotbought on Sat Aug 20, 2016 5:25 pm

For now I found that 10/12si can easily be upgraded to cs-144 140A alt

and found theeese
http://www.dbelectrical.com/p-4516-high-output-chevy-3-wire-alternator-140-amp-65-85.aspx
Looks like 10si body with 140A output.

by bigredlaguna on Sat Aug 20, 2016 5:46 pm

If I were going to get a 140 amp alternator, I would at least get it based on the 12si because of the better cooling fan.

by builtnotbought on Sat Aug 20, 2016 6:18 pm

bigredlaguna wrote:If I were going to get a 140 amp alternator, I would at least get it based on the 12si because of the better cooling fan.

https://www.summitracing.com/int/parts/pwm-57294

10si body, 150A output on top and baffle like on 12si plastic fan

by dynchel on Sat Aug 20, 2016 7:38 pm

I have a 105 amp alternator speced for a iroc z. (Sorry don't remember exact year) but the case is the sane. It fits when used as a one wire.

by fasrnur on Sun Aug 21, 2016 1:38 pm

I too had one off of a Camaro dynchel on my V-8 S10. If memory serves me correctly it was off of an 86. Worked great and I'll probably use one on my Chevelle too.

by bigredlaguna on Sun Aug 21, 2016 2:00 pm

builtnotbought wrote:https://www.summitracing.com/int/parts/pwm-57294

10si body, 150A output on top and baffle like on 12si plastic fan

This is actually a 12si case with a metal fan instead of the plastic one. This would be more reliable than the other one you picked because the case itself is designed to flow more air through the internal parts to prevent overheating.

Here is a good read about the differences.

http://www.madelectrical.com/electricaltech/delcoremy.shtml

by builtnotbought on Mon Aug 22, 2016 4:36 pm

bigredlaguna wrote:
builtnotbought wrote:https://www.summitracing.com/int/parts/pwm-57294

10si body, 150A output on top and baffle like on 12si plastic fan

This is actually a 12si case with a metal fan instead of the plastic one. This would be more reliable than the other one you picked because the case itself is designed to flow more air through the internal parts to prevent overheating.

Here is a good read about the differences.

http://www.madelectrical.com/electricaltech/delcoremy.shtml

Thank you! I will read it!

by fasrnur on Mon Aug 22, 2016 6:54 pm

Great read bigredlaguna. Thanks for sharing it.

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