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Reload this Page FYI: Stock Serpentine Pulley Diameters

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Old 01-30-2009, 01:55 PM   #1
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Car: 1989 Pontiac Trans Am GTA
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FYI: Stock Serpentine Pulley Diameters
Hows it going? I've searched all over this board for the diameters of the stock serpentine pulleys for reference purposes but found nothing so I thought I'd post them up:

Crank - 7 3/4"

Water Pump (long) - 6 1/2"

Power Steering - 6 1/2"

Alternator - 2 1/2"

Later,
Phoenix
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Old 01-30-2009, 02:17 PM   #2
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Re: FYI: Stock Serpentine Pulley Diameters
Great Info. Any idea if I can get a shorter belt and reroute it when I delete my AC or do I need an AC delete pulley?
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Old 01-30-2009, 11:49 PM   #3
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Car: 1989 Pontiac Trans Am GTA
Engine: 350 c.i.d. 5.7L TPI L98
Transmission: 700R4
Axle/Gears: 3.23 Gears

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Re: FYI: Stock Serpentine Pulley Diameters
I've heard you can only reroute the serpentine belt when removing the smog pump (correct me if i'm wrong). As for the a/c delete, you're going to have to use the a/c delete pulley along with the shorter belt. hope this helps.

Later,
Phoenix
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Old 07-14-2009, 10:14 PM   #4
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Re: FYI: Stock Serpentine Pulley Diameters
do you know how tall the stock tpi crank pulley is?

i was putting a paxton sc on my car and try to use a tbi crank pulley since i had underdrive pullies before, but its looks like the pulley needs to be like 1/4" taller so it can align with the rest of the accessorie's pulleys...
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Old 09-30-2009, 04:23 PM   #5
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Car: 1989 Pontiac Trans Am GTA
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Axle/Gears: 3.23 Gears

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Re: FYI: Stock Serpentine Pulley Diameters
Do you mean the offset?
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Old 09-30-2009, 08:49 PM   #6
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Re: FYI: Stock Serpentine Pulley Diameters
yeah well it turns out tbi truck pulleys arent the same as tpi. tpi's have a bigger offset
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Old 09-30-2009, 11:49 PM   #7
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Car: 1989 Pontiac Trans Am GTA
Engine: 350 c.i.d. 5.7L TPI L98
Transmission: 700R4
Axle/Gears: 3.23 Gears

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Re: FYI: Stock Serpentine Pulley Diameters
Well you taught me something .

Later,
Phoenix
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1989, 350, 3rd, 88, belt, camaro, firebird, formula, gen, pontiac, pulley, pulleys, serpentine, serpintine, tbi, underdrive
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