alternator specs.... from idle and up

[RootBreaker]

Ok so my truck has a stock 63A alt. I know that 63 amps is at a certain rpm... anyone have breakdown charts that show the alternator amps per rpm's?

I wanna compair this alt with a 140 pontiac transport.... I have the pontiac one but tried the swap a while back and it never worked for me... tried even with the $20 delco converter part.... autozone tested my alt and said it was good.. but i think maybe it isnt.... Im curious if the amps in the 140 at idle is more than what my stocker is.....

 

[79Jimmy]

The best thing about the cs144 is the high output at idle. IIRC it should put out somewhere around 80 - 100 amps depending on idle speed. That's just off the top of my head, sorry no charts or graphs.

James

 

[Executioner]

I think the difference is about 4:1
the 63 is around 15-25
the 140 is around 60-100
Its worth the 4:1
Ps. most auto parts stores only test the output voltage, at no load
they don't load it down with any amps, so many test good with no load.

 

[fatbob]

Here is a page with some good comparision info. Keep in mind the RPM's they are referring to are ALT. shaft NOT engine RPM's.
http://oljeep.com/gw/alt/edge_Alternator_Theory.html#Section_3