Author Topic: 140 Amp Alternator  (Read 477 times)

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Offline Hill1430

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140 Amp Alternator
« on: August 30 2022, 10:37:02 AM »
Has anyone installed a 140 amp alternator from a 96 Impala 5.7 engine? I have watched a video and read that it is a direct swap. I purchased an AC Delco alternator and the two ears and clocking are good. The problem I see is the bolt for the back side of the alternator will not work for the bracket from the exhaust manifold. Also the pulley is about 3/16" in diameter smaller. Thoughts or suggestions? Should I leave well enough alone and go with another 120 amp alternator?
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Offline Steve Wood

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Re: 140 Amp Alternator
« Reply #1 on: August 30 2022, 11:00:30 AM »
I don't have a back brace on either car of mine.   Have not had one since the '90's.

It is a better built alternator and runs cooler.  I did not notice the pulley being smaller but that will allow it to put out more amps at low rpm if you needed them.  My choice for alternators when someone needs one.
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Offline Shimy87

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Re: 140 Amp Alternator
« Reply #2 on: August 30 2022, 11:26:06 AM »
same here, works great
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Offline Hill1430

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Re: 140 Amp Alternator
« Reply #3 on: August 30 2022, 02:10:54 PM »
Appreciate the replies. I will go ahead and install it.
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Online xracerx13

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Re: 140 Amp Alternator
« Reply #4 on: September 01 2022, 06:22:35 PM »
I just had my original rebuilt with 140A internals

Offline ~JM~

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Re: 140 Amp Alternator
« Reply #5 on: September 03 2022, 11:39:19 PM »
Smaller drive pulley?

Check the clearances around the tensioner pulley. Sometimes it makes contact with nearby bolt.

Run shorter TTA belt.

Offline Hill1430

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Re: 140 Amp Alternator
« Reply #6 on: September 08 2022, 10:04:42 PM »
Clearance is good. Now you have me thinking which belt to use.
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Offline ~JM~

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Re: 140 Amp Alternator
« Reply #7 on: September 09 2022, 12:04:59 AM »
Clearance is good. Now you have me thinking which belt to use.

1989 Turbo Trans Am belt is slightly shorter & works well.

See the end of the bolt from the A/C compressor mount? The tensioner pulley was tapping against it.
« Last Edit: September 09 2022, 12:13:50 AM by ~JM~ »

Offline Steve Wood

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Re: 140 Amp Alternator
« Reply #8 on: September 09 2022, 09:36:58 AM »
Steve Wood

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A lot of broken parts does not make you a racer; it makes you a slow learner.

Offline Hill1430

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Re: 140 Amp Alternator
« Reply #9 on: September 15 2022, 11:17:10 PM »
I am having a heck of a time trying to find a belt. :x
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Offline ~JM~

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Re: 140 Amp Alternator
« Reply #10 on: September 16 2022, 01:34:06 AM »
Gates Micro-V K060630

Fairly certain I ordered it through O'Rielly's.

Offline Hill1430

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Re: 140 Amp Alternator
« Reply #11 on: September 18 2022, 10:31:00 PM »
Cool. Thanks!
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