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Join Date: May 2003
Location: N.C.
Posts: 1,473
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Alternator upgrade
So I had this great idea about putting a 84-89 Carrera alternator in my ‘71 911.
For the upcoming electric a/c install. Anyway without doing my homework I ordered an ‘88 alternator and it’s a ton bigger than the earlier one. So what’s next? Matching the fan housing? Or get a Carrera fan and housing? Longer bolts would not work as the fan will not sit inside the housing.   
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05-23-2018, 02:03 PM
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Join Date: Jul 2013
Location: South East England
Posts: 1,700
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Our 180A units are now available. Direct fit for your '71.
Classic Retrofit: Six phase high output alternator.
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05-23-2018, 02:33 PM
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Well I am trying to prepare for your a/c in my car. I did see earlier that you recommend a 90amp alternator or better. My car is basic and will not have even a radio so that is why I figured a 90amp would be enough.
Anyway is your alternator the same dimension as a '71 unit? Mine is obviously not original as it is a Valeo. It had to have spacers on the back of it into order for the fan to fit properly. I'm thinking that the 69-73 and 74-83 and 84-89 all had different size housings. Just from looking at pictures on line it looks like where the alternator bolts to the housing on the later models it is a lot thinner. I don't mind buying the proper alternator needed for your a/c. But will I end up in the same boat as I am with the Carrera unit?
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05-23-2018, 02:41 PM
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Location: Nash County, NC.
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There is 3 different back spacing on the fan housings.
The original housings have approximately 24 mm of thickness. The 75 to 83 including the smaller SCs have a back space of 19 mm The Carrera uses a housing that has approximately 6 mm thickness. The Carrera has a tenancy to crack from tension and age. Bruce |
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05-23-2018, 02:52 PM
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Location: South East England
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Our new alternator has the correct back spacing for an early housing so is direct fit for a '71 housing.
Mid year / SC and late 3.2 offsets are catered for using spacers.
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05-23-2018, 03:03 PM
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PM sent Jonny...
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05-24-2018, 12:40 PM
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Location: New Hampshire
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 Great info here. Bump to the Top. Len
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06-09-2019, 07:14 AM
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As a follow up. I ended up buying the alternator from out friends in England. Timmy2 made me a new engine harness. Once installed I never looked back. No issues whatsoever.
 
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06-09-2019, 07:36 AM
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