Bracket Talk
Alternator

This topic can be found at:
https://drr.infopop.cc/eve/forums/a/tpc/f/80760912/m/7027056007

July 09, 2023, 02:52 PM
racerdude2054
Alternator
What alternator are people running these days?
July 09, 2023, 04:11 PM
Larry Woodfin
For most of my SBC builds I install a common auto parts store alternator. Select an alternator of 80 - 100-amp rating. In some situations, a factory mounting will work, in other situations a custom mounting will be built. It will be wired just as if it were an OE install. I see no reason to do otherwise. One thing of importance, select pulleys that limit the alternator speed. Spinning the alternator approximately engine speed is completely sufficient.


Larry Woodfin



July 09, 2023, 04:53 PM
Rodney Pryor
House of Payne
July 09, 2023, 05:00 PM
1320racer
#2005 16volt 120amp from East Coast Alternators in both cars
July 09, 2023, 10:03 PM
Little Chief
My wife bought me a 16 volt super mini from HOP 2 years ago for Christmas. It's a quality piece of equipment and does the job well.
July 09, 2023, 10:57 PM
markemark
I use one 12v battery and never charge when at the track………… NEVER!


July 10, 2023, 07:14 AM
Curly1
PM sent.


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July 10, 2023, 08:06 AM
Cashflow
East Coast Ultra Mini 16 volt on mine. Seems to work okay. I put the maintainer on it at the track but lately it seems I can't get past first round so no real reason. LOL


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July 10, 2023, 08:21 AM
Wooley
If you have a 12 volt system I like an oem gm alternators. Easy to wire in and also easy to find a replacement if needed. As Larry said watch pulley ratio so you don’t over speed the alternator. If on a 16 volt system then I would probably go with house of Payne.
July 10, 2023, 08:48 AM
markemark
quote:
One thing of importance, select pulleys that limit the alternator speed. Spinning the alternator approximately engine speed is completely sufficient.


Good advice for a circle track car. For drag racing I use 2 to 1 which I believe is a better choice.

Some engines idle very low which can limit the alternator output. My engine idles 1400 rpm both in neutral, as well as in gear. I use 2 gauge charging wire.

Power Master site says their alternators will take up to 20,000 rpm for short periods.
July 10, 2023, 09:29 AM
TomR
My old single wire alt couldn't keep up with the demands and the car was inconsistent. Once I installed a grid, I could see the alternator struggling to reach 12v after the shift. It would actually drop to 10v and barely make it back to 12v by the end of the run.

I installed a 100amp Powermaster single wire alt and it straightened out the problem.


72 Nova "Hooptie"
July 10, 2023, 09:47 AM
Eman
I've had a Powermaster alternator with the low mount aluminum bracket and pulley on my car for over 20 years. It works fine, had to have a regulator replaced once at a local shop. Keep a spare belt but have never needed it. Have a volt gauge on the dahs so I can see it's working. 12V simple and reliable.
July 10, 2023, 11:50 AM
67TSCHEVY2
east coast 16 with their crank pulley
July 12, 2023, 03:35 PM
Goob
Running the alternator my car was delivered with new, 63 amp Delcotron, 1-wire converted, running 1:1 pulley ratio, with a single Group 31 battery.
It's adequate.


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N375
July 17, 2023, 08:10 AM
Bob Payton
Get the biggest alternator you can fit. Wont hurt anything


--------------------
Bob Payton
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July 18, 2023, 06:28 AM
gd31
If using a high amp alternator be sure to use at least a 2ga wire. The 10ga wire that came with the switch panel wiring kit come to find out wasn't big enough Mad




July 18, 2023, 07:39 PM
markemark
quote:
If using a high amp alternator be sure to use at least a 2ga wire


Agreed on the 2 gauge minimum. If tying the alternator wire to the starter (my preferred method) using the same size wire on alternator as battery to starter is a wise choice.
July 19, 2023, 06:19 AM
BG7X77
quote:
Originally posted by markemark:
quote:
If using a high amp alternator be sure to use at least a 2ga wire


Agreed on the 2 gauge minimum. If tying the alternator wire to the starter (my preferred method) using the same size wire on alternator as battery to starter is a wise choice.


Agreed!
One of the most common errors on race cars.


BG
July 19, 2023, 09:58 AM
Eman
People must have some rockin stereos in their cars to need all of that amperage.
July 19, 2023, 10:58 AM
CURTIS REED
quote:
Originally posted by Eman:
People must have some rockin stereos in their cars to need all of that amperage.


Agreed. LOL



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