Alternator OVERdrive pulley?
Thread Starter
Joined: Aug 2009
Posts: 1,972
Likes: 127
From: Los Angeles
Car: 1989 IROC Convertible
Engine: 350 TPI L98
Transmission: WC T5
Axle/Gears: 3.42
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?
Joined: Sep 1999
Posts: 4,353
Likes: 308
From: NJ
Car: 92 Firebird
Engine: 4.8 LR4
Transmission: T56
Axle/Gears: 3.45 9 Bolt
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
https://www.summitracing.com/parts/mch-112
This is the whole kit
https://marchperformance.com/aluminu...-kit-3494.html
Last edited by scooter; Feb 12, 2019 at 10:12 AM.
Joined: Mar 2005
Posts: 615
Likes: 27
From: Austin TX
Car: 89 Formula
Engine: 383 SBC/HSR
Transmission: 700R4
Axle/Gears: 3.73
Re: Alternator OVERdrive pulley?
Ebay has them for $20, have one on my car. Works great with my 250A alternator.
Thread Starter
Joined: Aug 2009
Posts: 1,972
Likes: 127
From: Los Angeles
Car: 1989 IROC Convertible
Engine: 350 TPI L98
Transmission: WC T5
Axle/Gears: 3.42
Re: Alternator OVERdrive pulley?
Thanks. $250! I'll check eBay... :-)
heat seeker do you have a link or part number for a stock LB9?
heat seeker do you have a link or part number for a stock LB9?
Last edited by Tootie Pang; Feb 12, 2019 at 10:22 AM.
Thread Starter
Joined: Aug 2009
Posts: 1,972
Likes: 127
From: Los Angeles
Car: 1989 IROC Convertible
Engine: 350 TPI L98
Transmission: WC T5
Axle/Gears: 3.42
Re: Alternator OVERdrive pulley?
Hah. That was the March pulley set.
Does this look right?
https://www.ebay.com/itm/Delco-17Si-27Si-CS121-Alternator-6-Groove-Overdrive-Pulley-Increase-Amp-At-Idle/192037293405?hash=item2cb6508d5d:g:HpAAAOSwgQ9VidIb:sc:USPSFirstClass!91206!US!-1:rk:1
f:1&frcectupt=true
Does this look right?
https://www.ebay.com/itm/Delco-17Si-27Si-CS121-Alternator-6-Groove-Overdrive-Pulley-Increase-Amp-At-Idle/192037293405?hash=item2cb6508d5d:g:HpAAAOSwgQ9VidIb:sc:USPSFirstClass!91206!US!-1:rk:1
f:1&frcectupt=true Joined: Mar 2005
Posts: 615
Likes: 27
From: Austin TX
Car: 89 Formula
Engine: 383 SBC/HSR
Transmission: 700R4
Axle/Gears: 3.73
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.
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; Feb 12, 2019 at 12:38 PM.
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Supreme Member
Joined: Jan 2003
Posts: 4,621
Likes: 309
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
gets you 130 amps at idle.
https://www.thirdgen.org/forums/electronics/755380-ad244-conversion-took-plunge.html
Joined: Oct 2001
Posts: 12,214
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
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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From: Chasing Electrons
Car: check
Engine: check
Transmission: check
Re: Alternator OVERdrive pulley?
Using a slightly smaller alternator pulley works. But need to keep the RPM down. Otherwise can wreck the alternator.
RBob.
RBob.
Supreme Member
Joined: Jan 2003
Posts: 4,621
Likes: 309
Re: Alternator OVERdrive pulley?
Joined: Oct 2001
Posts: 12,214
Likes: 1,140
From: Il
Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Thread Starter
Joined: Aug 2009
Posts: 1,972
Likes: 127
From: Los Angeles
Car: 1989 IROC Convertible
Engine: 350 TPI L98
Transmission: WC T5
Axle/Gears: 3.42
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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