Alternator upgrade
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Alternator upgrade
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
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
builtnotbought- G3GM Member
- Street Cred : 3
Re: Alternator upgrade
Loads of upgrades for our altenators. Its done all the time. Just google "chevy alternator si wiring harness". Plenty info out there.
Joe73- Donating Member
- Street Cred : 71
Re: Alternator upgrade
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.
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.
builtnotbought- G3GM Member
- Street Cred : 3
Re: Alternator upgrade
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.
bigredlaguna- G3GM Senior Member
- Street Cred : 53
Re: Alternator upgrade
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
builtnotbought- G3GM Member
- Street Cred : 3
Re: Alternator upgrade
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.
dynchel- Donating Member
- Street Cred : 40
Re: Alternator upgrade
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.
fasrnur- G3GM Enthusiast
- Street Cred : 6
Re: Alternator upgrade
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
bigredlaguna- G3GM Senior Member
- Street Cred : 53
Re: Alternator upgrade
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!
builtnotbought- G3GM Member
- Street Cred : 3
Re: Alternator upgrade
Great read bigredlaguna. Thanks for sharing it.
fasrnur- G3GM Enthusiast
- Street Cred : 6

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