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Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 01-28-2006, 05:29 PM   #1
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Default Don't overlook the obvious

Tensioner pulleys. We all know we can buy the 3.5" at various places online like www.pulleyboys.com , www.zzperformance.com , or www.INTENSE-racing.com right?
http://www.zzperformance.com/grand_p...ts1.php?id=195
http://www.pulleyboys.com/gms1idler.html
http://www.intense-racing.com/Mercha...tegory_Code=BE
What about a local source? Yup. I found 'em. In various diameters, too.

I recently diagnosed my Accessory belt tensioner as failing (FYI, on the Series 1 L67 this is only for the power steering and alternator, the AC, SC, and WP are on the other path).

So I picked up my new tensioner assembly at the local dealer this morning when it came in, and started thinking about the smaller diameter pulley on my 160-amp alternator. A 3.5" Tensioner pulley in place of the stock 3" may be too much, but a 3.25" might be nice to put the tensioner back into it'* normal operating range.

So lilpooky and I drove around the corner to NAPA with the AC-Delco brand spankin' new tensioner with 3" pulley.

I spent less than 10 minutes at the counter with the book, and looked at a few pulleys they had in stock, measuring diameter and bearing/face offsets. Here'* what I found:

Stock diameter is 3".

NAPA stock number 38027 is a plastic OEM-style replacement in 3.25". This goes on my accessory tensioner today. This might be a choice for L67'* that don't make extreme steps on SC pulley diameter. Anyone with a performance alternator with smaller pulley should consider this. Also perfect for a 92/93 L67 running a 2.3" or 2.4" pulley, or 94/95 L67 running 2.6 or 2.7" pulley.

NAPA stock number 38020 is a 3.5" steel pulley for those with the smaller SC pulleys on L67'*. This is not the same design as the steel pulleys we've had a couple failures with recently. I like the design much better from NAPA.

Pics of the 3", 3.25", and 3.5" to be posted later today.

While the NAPA pulleys are slightly more expensive ($27) than the ZZP or PB, and slightly cheaper than the INTENSE, you don't have to pay shipping and you can pick these up locally off the shelf. You also now have the choice of a pulley in between stock and the readily-available 3.5" oversized.
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Old 01-29-2006, 07:52 PM   #2
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If I do decide to go with a 160 Amp Alt from Mr.Alternator.com..i will make a trip to my local NAPA with that part number...i know a few of the front counter people now, they buy lots from The Gear Centre..
Good to know that other items can be bought for our cars offline as well
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Old 01-29-2006, 08:48 PM   #3
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So what is a good size for a 92 with a stock 92 pulley? With the oversized tensioner pulley, I can't use a stock belt.
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Old 01-29-2006, 11:18 PM   #4
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Quote:
Originally Posted by J Wikoff
So what is a good size for a 92 with a stock 92 pulley? With the oversized tensioner pulley, I can't use a stock belt.
Stock pulley? Stock idler as far as I'm concerned. Maybe a 3.25"?

Here'* some sizes for you to see (3.5" is installed on SC tensioner, and the 3.25" is now on the accessory tensioner due to an undersized alt pulley):

3" front, 3.25" middle, 3.5" rear:

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Old 02-04-2006, 02:01 AM   #5
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Bill out of curiosity, how'* the 3.25 pulley been treating the car? Anything crop up?
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