Re: Square Back Alt versions
[Re: dragon slayer]
#2780268
06/01/20 08:42 AM
06/01/20 08:42 AM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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yeap, those alts with the stator barelly visible between half cases are wider not just on diameter but also on deepth. No matter if 60 or 78 amps, but simply being the 80s alts. I have never tried to fit a later stator on an earlier case actually or if this would make difference on the full size. Sure will look some weird with the ridge around.
Rotor is "the same" at least on size. The difference is really the stator. My alt went bad and once I used an older square back alt rotor I had laying around and worked the same. I couldn't notice any physical difference between my old squareback rotor and the one on the 80s alt.
Diode packs... not phisical diff either. Dunno on ouput capacity, but sure not phisical diff
I made that alt upgrade on my car and, as mentioned on some magazine article ( upgrading the charging system on a 67 or 68 Barracuda ) and for a nice fit some other changes are recomended. On my car what I did is trim around 2 or 3 mms the rear alt spacer to keep the belt aligment.
I also used a longer belt, because the rear of alt met with block, so need to pull away a bit more the alternator from the block, for BB at least. At the end came out perfect. Sure having RV2 compressor the longer distance ( which is already long from factory ) will make slap a little bit more the belts when AC is on, but the diff is no HUGE. I got the belt to set the alt away just enough from the block and get the propper aligment allong with the rear alt spacer.
I think this wouldn't happen on pre 68 setups.... not at least on the belt lenght, but would need the rear spacer trim
Yes, Most of upgraded alternators are based on this later setup, I.E., Powermaster, Dbelectric. HOWEVER Tuff Stuff are using the earlier square back alt per I have being able to check on cars already using those, so if you don't want to deal with the rear spacer trim or longer belt, this could be the way to go. I'd go with them when money is enough for that.
Last edited by NachoRT74; 06/01/20 08:50 AM.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Square Back Alt versions
[Re: Mattax]
#2780557
06/02/20 04:14 AM
06/02/20 04:14 AM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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I know initially tuff stuff sold the "revised" squarebacks, but now ( and maybe since 3 or 4 years ago) they are offering the earlier setup. I have being over this because when time ( and money ) comes I want to be sure they are the correct 74 style. I really wish to get back to the correct year look and more important, the correct belts lenght.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Square Back Alt versions
[Re: dragon slayer]
#2780558
06/02/20 04:40 AM
06/02/20 04:40 AM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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In 76 they changed covers so the stator inserts between the covers and you only see about 1/4 ridge of the stator. Stator and rotor changed. Rotor is longer I can't tell when it was actually the revised alt design but not sure if it was on 70s. I allways thought that but it seem it was more into the 80s. Anyway, as I mentioned The Beck Arnley 78 amps alt I bought quite ago got the rotor damaged and used the old squareback alt rotod I had to replace it. Side by side couldn't note any physical difference... even both measured something like 5 ohms. And it was my running alt for many years later untill I found a NOS Mopar alt at an old Mopar shop in Venezuela, revised design SUPPOSELLY 100 amps ( per a decal it had ). I bought two alts in fact. One is storaged. sure I changed the pulley for the smaller one
Last edited by NachoRT74; 06/02/20 08:09 AM.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Square Back Alt versions
[Re: Mattax]
#2780580
06/02/20 08:17 AM
06/02/20 08:17 AM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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Mattax... this is a newer Tuffstuff alt. Is hard to see, but is the earlier setup and still 100 amps ( per the guy who posted it at dc.com )
Last edited by NachoRT74; 06/02/20 08:35 AM.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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Re: Square Back Alt versions
[Re: Mattax]
#2780753
06/02/20 02:43 PM
06/02/20 02:43 PM
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Joined: Aug 2007
Posts: 6,098 Valencia, España
NachoRT74
master
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master
Joined: Aug 2007
Posts: 6,098
Valencia, España
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yeap... I recently made this diagram to show how a long attaching screw could accidentally ground that brush ( if goes throught the isolator ). I got that once because the screw used was a selftatting one with a pointy end
Last edited by NachoRT74; 06/02/20 02:44 PM.
With a Charger born in Chrysler assembly plant in Valencia, Venezuela
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