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oversized/hipo alternator pulley on a one wire alternator?

December 2 2017 at 11:58 AM
kelly  (Login lowriser)

be neat if i could swap a larger pulley onto this one wire alternator on my pinto,
is it possible?

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Tom P
(Login tomposthuma)


December 2 2017, 12:16 PM 

Not if it is a GM style alternator. But even if it fits it may not be a good idea to raise the RPM it starts charging at. Some of those one wire deals require you rev the engine first before it kicks in. If you start it and let it idle it doesn't charge.

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(Login t_zwick)

Re: oversized/hipo alternator pulley on a one wire alternator?

December 3 2017, 4:57 AM 

Possible? Absolutely. Good idea? Well that depends. The 3g on my 66 merc has a slight alignment issue that I have yet to resolve so to stop belt squeal I installed a larger pulley until I can come up with a better mounting design.

Anyway, the big ass pulley slows the alternator down so much that I get <12v at idle. Puts an unnecessary tax on the battery and lights dim until RPM's get up a bit.

The big pulley is not a long term solution for my case nor, in my opinion, a good option for a street driven car.

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(Select Login Tommy-T)

I have a large pulley...

December 3 2017, 10:22 AM 

...from one of those Mustang places that's supposed to be for a 271 horse 289.

Fits fine on my GM style 1 wire Powermaster alternator that's on my Mustang.

I tried a Moroso big pulley and it would hardly charge, and you had to rev it pretty high to get it to excite.

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