G3GM 1973 to 1977 A-bodys. Chevelles, Monte Carlos, El Caminos, Laguna, 442, Cutlass, Malibu, GTO, LeMans, Century, Regal, Grand Am, Grand Prix, Sprint, Gran Sport, Can Am, Hurst-olds, and other 73-77 A-bodies


Alternator upgrade

G3GM :: G3 Tech :: Electrical

Go down

Alternator upgrade

Post 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
avatar
builtnotbought
G3GM Member
G3GM Member

Street Cred : 3

Back to top Go down

Re: Alternator upgrade

Post 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.
avatar
Joe73
Donating Member
Donating Member

Street Cred : 71

Back to top Go down

Re: Alternator upgrade

Post 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.
avatar
builtnotbought
G3GM Member
G3GM Member

Street Cred : 3

Back to top Go down

Re: Alternator upgrade

Post 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.
avatar
bigredlaguna
G3GM Senior Member
G3GM Senior Member

Street Cred : 53

Back to top Go down

Re: Alternator upgrade

Post 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
avatar
builtnotbought
G3GM Member
G3GM Member

Street Cred : 3

Back to top Go down

Re: Alternator upgrade

Post 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.
avatar
dynchel
Donating Member
Donating Member

Street Cred : 40

Back to top Go down

Re: Alternator upgrade

Post 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.
avatar
fasrnur
G3GM Enthusiast
G3GM Enthusiast

Street Cred : 5

Back to top Go down

Re: Alternator upgrade

Post 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
avatar
bigredlaguna
G3GM Senior Member
G3GM Senior Member

Street Cred : 53

Back to top Go down

Re: Alternator upgrade

Post 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!
avatar
builtnotbought
G3GM Member
G3GM Member

Street Cred : 3

Back to top Go down

Re: Alternator upgrade

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

Great read bigredlaguna. Thanks for sharing it.
avatar
fasrnur
G3GM Enthusiast
G3GM Enthusiast

Street Cred : 5

Back to top Go down

Re: Alternator upgrade

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

G3GM :: G3 Tech :: Electrical

 
Permissions in this forum:
You cannot reply to topics in this forum