Pulley diameter question ??

79yj · Sep 13, 2004

If I want an alternator to make more power at a lower rpm then should I increase the size or make it smaller?
My onboard welder needs to run at 2500+ rpms to make a decent amount of power to weld with. I would like it to make that power at something much closer to idle and make more power at the same rpms.
Thanks, Eric

MaXJohnson · Sep 13, 2004

If the pulley on the alternator is smaller, it will turn faster. Keep in mind that at higher engine RPM, the alternator may be turning faster than it was designed for.

2xtreme · Sep 13, 2004

79yj said:
If I want an alternator to make more power at a lower rpm then should I increase the size or make it smaller?
My onboard welder needs to run at 2500+ rpms to make a decent amount of power to weld with. I would like it to make that power at something much closer to idle and make more power at the same rpms.
Thanks, Eric

You can run a slightly smaller pulley on the stock size alt to get the power at a slightly lower rpm. I believe that you can only run one size smaller pulley (there is nothing smaller that fits). Any alt should have one.

I have a smaller pulley on a 185 amp alt.

Michael

Pulley diameter question ??

79yj

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MaXJohnson

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2xtreme

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