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Alternator OVERdrive pulley?

Old 02-12-2019, 08:44 AM
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Alternator OVERdrive pulley?

Did a quick search for this. Seems like a neat way to get more idle juice out of the alternator. Didn't find any for sale. Do these exist?
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Old 02-12-2019, 10:03 AM
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Re: Alternator OVERdrive pulley?

When I had my TPI, I bought the March "Power and Amp" series. the crank was underdrive, but the alternator was an overdrive. I think March sells the smaller alternator pulley separately

https://www.summitracing.com/parts/mch-112

This is the whole kit
https://marchperformance.com/aluminu...-kit-3494.html

Last edited by scooter; 02-12-2019 at 10:12 AM.
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Old 02-12-2019, 10:13 AM
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Re: Alternator OVERdrive pulley?

Ebay has them for $20, have one on my car. Works great with my 250A alternator.
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Old 02-12-2019, 10:17 AM
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Re: Alternator OVERdrive pulley?

Thanks. $250! I'll check eBay... :-)

heat seeker do you have a link or part number for a stock LB9?

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Old 02-12-2019, 10:20 AM
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Re: Alternator OVERdrive pulley?

It's 250 amps, not dollars. lol

No prob!
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Old 02-12-2019, 12:30 PM
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Re: Alternator OVERdrive pulley?

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Old 02-12-2019, 12:35 PM
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Re: Alternator OVERdrive pulley?

Yep sure does.

https://www.ebay.com/itm/POWERMAXUSA...frcectupt=true

I bought this one. It's slightly smaller, but not by much. Mine is the CS130 alternator style....shaft should be the same size.

Last edited by heat seeker; 02-12-2019 at 12:38 PM.
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Old 02-12-2019, 06:17 PM
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Re: Alternator OVERdrive pulley?

I would just upgrade to an AD244 alternator. Very easy and inexpensive upgrade.

gets you 130 amps at idle.

https://www.thirdgen.org/forums/electronics/755380-ad244-conversion-took-plunge.html
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Old 02-12-2019, 06:44 PM
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Re: Alternator OVERdrive pulley?

I use a pulley from a fox body mustang, its a bit smaller than the factory one.
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Old 02-12-2019, 08:30 PM
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Re: Alternator OVERdrive pulley?

Using a slightly smaller alternator pulley works. But need to keep the RPM down. Otherwise can wreck the alternator.

RBob.
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Old 02-12-2019, 08:31 PM
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Re: Alternator OVERdrive pulley?

Originally Posted by RBob View Post
Using a slightly smaller alternator pulley works. But need to keep the RPM down. Otherwise can wreck the alternator.

RBob.
all the more reason to just upgrade to an alternator that's designed to put out the higher amperage at lower rpm, like the AD244.
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Old 02-13-2019, 05:56 AM
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Re: Alternator OVERdrive pulley?

Originally Posted by RBob View Post
Using a slightly smaller alternator pulley works. But need to keep the RPM down. Otherwise can wreck the alternator.

RBob.
I keep it under 8000rpm all good
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Old 02-24-2019, 09:22 PM
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Re: Alternator OVERdrive pulley?

Thanks for the help. Works GREAT! Needed one size smaller belt. My belt was already on the ragged edge of too long. Volts stay nice and strong at idle and it powers the 60A of audio without a hiccup.
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