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looking for high amp alternator that charges at idle #1236428
05/20/12 04:11 PM
05/20/12 04:11 PM
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Irving, TX
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I'm looking for a drop in alternator with a high output at idle.
I understand the Powermaster alternators will do that but they don't drop in without changes to the brackets.
I don't have time to cobble something together before the power tour but I'd like to change the alternator.

The blower motors each pull 20 amps. If I have the A/C running and lights on at idle it will pull the stock alternator down pretty hard.

Does anybody have any experience with an alternator that fits these needs?


We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
Re: looking for high amp alternator that charges at idle [Re: feets] #1236429
05/20/12 04:48 PM
05/20/12 04:48 PM
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Re: looking for high amp alternator that charges at idle [Re: Andrewh] #1236430
05/20/12 05:49 PM
05/20/12 05:49 PM
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Irving, TX
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I know about hot rodding the stock alternators but they're not known to charge well at idle.


We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
Re: looking for high amp alternator that charges at idle [Re: feets] #1236431
05/20/12 06:53 PM
05/20/12 06:53 PM
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ahy Offline
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The best stock square back is the late 70's 78 amp unit. Its available as reman. The Chrysler case Powermaster ususally rated 75 amps will have similar performance. 50 amps at idle is about as good as it gets with either of these. Depending on what you have now, that may be a worthwile improvement.

With iron heads, the 140 amp Powermaster may bolt in and work. When I tried it on a lowdeck with AC type brackets it bolted up... only problem was the back of the alternator and the Ed heads wanted to take up the same space if it was adjusted in. I returned it and ran a 75 A Powermaster for a while. With a big EFI fuel pump it just didn't do so well - big discharge at idle and barely kept up with AC and brights on running down the road. I finally cleaned up the brackets I had for the "big Chrysler" 100 A alternator from a '78 Cordoba. With a reman alternator, my power problems are solved. Its just heavy.

These cars survived a long time with the idle discharge from new. As long as you haven't added much load and aren't running sensitive electronics, you might be able to just get along with it using one of the better squarebacks. A good big battery helps.

Re: looking for high amp alternator that charges at idle [Re: feets] #1236432
05/20/12 06:55 PM
05/20/12 06:55 PM
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Rittman Ohio
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Feets I have a Denso unit from a Toyota pick-up I scored during cash for clunkers and it performs flawlessly at all RPM's
Get the parts to install it from AndyF's site www.arengineering.com
Gus

7213847-IMG_0019-1.JPG (128 downloads)
Last edited by fourgearsavoy; 05/20/12 06:58 PM.

64 Plymouth Savoy
493 Indy EZ's by Nick at Compu-Flow
5-Speed Richmond faceplate Liberty box
Dana 60
Re: looking for high amp alternator that charges at idle [Re: feets] #1236433
05/20/12 08:16 PM
05/20/12 08:16 PM
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Indiana
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""I understand the Powermaster alternators will do that but they don't drop in without changes to the brackets.""

Both of my Powermaster alternators dropped right in with no problems to the brackets. 63a at idle and 90a max. is what my current tag states.


1970 YO7 A66 [Canadian Export] F8 Challenger
340 (Currently in shop for stroker assy.)
Re: looking for high amp alternator that charges at idle [Re: YO7_A66] #1236434
05/20/12 08:19 PM
05/20/12 08:19 PM
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Kent, Wa
340SHORTY Offline
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Would a different diameter pully help ?


I am truckless..
Re: looking for high amp alternator that charges at idle [Re: 340SHORTY] #1236435
05/20/12 08:21 PM
05/20/12 08:21 PM
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Kirkland, Washington
Pacnorthcuda Offline
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Quote:

Would a different diameter pully help ?




Sure would. Smaller Alt, or Bigger Crank.

Re: looking for high amp alternator that charges at idle [Re: YO7_A66] #1236436
05/20/12 08:23 PM
05/20/12 08:23 PM
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Athens, Greece
Pyper70 Online content
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dropped in a Power Master 140amp on my 70 Charger, 440 Non-AC, never modified a bracket for it. You gotta make sure its tightened good though. When I put my foot down the belt would tighten up, flex the alternator and the back of it would tap the cylinder head, kill the fusible link.

Clean up your engine bay, remove your voltage regulator. I run a Delco on my 69. Cleaner engine bay, less wires, Start the car, rod check to 1500rpm's. Alternator on and charging at 14.0v. 100amp alternator


Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
Re: looking for high amp alternator that charges at idle [Re: feets] #1236437
05/20/12 08:30 PM
05/20/12 08:30 PM
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Coram, NY
Pool Fixer Offline
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Quote:

I'm looking for a drop in alternator with a high output at idle.
I understand the Powermaster alternators will do that but they don't drop in without changes to the brackets.
I don't have time to cobble something together before the power tour but I'd like to change the alternator.

The blower motors each pull 20 amps. If I have the A/C running and lights on at idle it will pull the stock alternator down pretty hard.

Does anybody have any experience with an alternator that fits these needs?




130 amp denso of an 02 RAM van bolts to a 440 with the smallest of mods. Trim 1/2" of one bolt spacer, get a used 70's GM alt pulley, go to hardware store and buy 2 nuts. It doesn't get much easier than that. of course you have to a little wiring but that's going to have to be done on ANY high output alternator you get.

It will sit close to the block, but it's workable. I've had mine on the charger for 10 years and it flat out kicks azz. With every single thing in the car turned on (electric fuel pump, electric fans, hi brights, heater on high) I still measured 14v at idle. There are other versions of this alternator. I remember seeing a lot of them in the 90 amp range and DIRT cheap.

Denso Alt Swap Linky

Re: looking for high amp alternator that charges at idle [Re: Pool Fixer] #1236438
05/20/12 09:58 PM
05/20/12 09:58 PM
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Irving, TX
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I ran one of the Denso alternators on the hot rod. It required different brackets and pulleys. I compared the Denso alternator with an old square back today. The pulleys don't quite line up. I would have to cut down the alternator bracket that bolts to the cylinder head then see what other changes would be required.

The Imperial has a smog pump, A/C, power steering, and water pump to run off the crank pulley. I have axed the smog pump but it still required a different crank pulley.

I am not going to have the time to fiddle around making brackets. Between now and the Power Tour I have exactly one free day to play with the car.


We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
Re: looking for high amp alternator that charges at idle [Re: feets] #1236439
05/20/12 10:29 PM
05/20/12 10:29 PM
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I think there is a decent chance the 140A MOPAR adapted Powermaster will bolt in and clear with iron heads. If you really need the juice, worth a try. Summit took mine back when it didn't fit w. Ed heads. As backup, I'd have a 78 amp parts store reman squreback or a 75 amp Powermaster square back on hand.

Re: looking for high amp alternator that charges at idle [Re: feets] #1236440
05/20/12 10:30 PM
05/20/12 10:30 PM
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North Dakota
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Quote:

.....The blower motors each pull 20 amps. If I have the A/C running and lights on at idle it will pull the stock alternator down pretty hard.......




Sounds like you just need a bigger alternator. Period.


"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
Re: looking for high amp alternator that charges at idle [Re: 6PakBee] #1236441
05/20/12 10:34 PM
05/20/12 10:34 PM
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Irving, TX
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Quote:

Quote:

.....The blower motors each pull 20 amps. If I have the A/C running and lights on at idle it will pull the stock alternator down pretty hard.......




Sounds like you just need a bigger alternator. Period.




It's a completely stock setup. The alternators were sufficient for most cars. The Imperials really could have used more output.


We are brothers and sisters doing time on the planet for better or worse. I'll take the better, if you don't mind.
- Stu Harmon
Re: looking for high amp alternator that charges at idle [Re: feets] #1236442
05/20/12 11:05 PM
05/20/12 11:05 PM
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Arizona
jsully Offline
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Have you considered installing relay's? I added them to my headlights and fuel pump with great results (no dim lights and full 13volts to the pump). Battery power straight to Lights / fans / pumps...just an option.

Re: looking for high amp alternator that charges at idle [Re: jsully] #1236443
05/20/12 11:26 PM
05/20/12 11:26 PM
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Here
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I was looking into the same thing and ruled out the Powermaster 140 too.

I see Tuff-Stuff makes some listed at 100A units, this one is Chrysler square back and externally regulated (internal version there too). But I have no experience with them on knowledge of what they really put out.

http://www.summitracing.com/parts/TFF-7509RCSP/


Ride eternal, shiny and chrome
Re: looking for high amp alternator that charges at idle [Re: DirectSubjection] #1236444
05/20/12 11:36 PM
05/20/12 11:36 PM
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I understand the Tuff Stuff 100 A unit has idle output in the 40-50 A range - similar to or slightly less than the OE 78 amp or Powermaster 75 amp.

Re: looking for high amp alternator that charges at idle [Re: feets] #1236445
05/21/12 02:02 AM
05/21/12 02:02 AM
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West Coast, USA
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I'm using an AC Delco CS 144 alternator on my 1970, because it puts out 115 amps at idle over 200 amps above a fast idle. Nothing mentioned here even comes close.


1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's
1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
Re: looking for high amp alternator that charges at idle [Re: jbc426] #1236446
05/21/12 12:09 PM
05/21/12 12:09 PM
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Athens, Greece
Pyper70 Online content
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Quote:

I'm using an AC Delco CS 144 alternator on my 1970, because it puts out 115 amps at idle over 200 amps above a fast idle. Nothing mentioned here even comes close.




Yeah but most of us don't need 200 amps. What can you possibly install on the car that would require such a large draw? two ...maybe four speakers? A subwoofer? An amplifier? A pair of electric seats, heated cup holders? a set of electric fans...push it and say you wanna have HID headlights. Bit excessive


Family owned 1969 Charger R/T DualQuad 440/727/GVO/3.55s
Re: looking for high amp alternator that charges at idle [Re: Pyper70] #1236447
05/21/12 12:18 PM
05/21/12 12:18 PM
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Shoreline, Washington
72roadrunnergtx Offline
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Anybody here running one of these Quick Start upgrade kits ?


1972 Road Runner GTX 440 6bbl 5-speed
[img]http://72rrgtx.com/carpics/bucket/DSC06730r-1.jpg[/img]
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