It won't apply less load, but will keep the charging voltage more consistent
(and slightly higher) at idle.
Factory sizes are (measured at the outer rim): 61mm (Small one) and 70mm
(large one). All of the Hemi's and most of the 4.7L's have the smaller one
and the larger came on alternators from 1992-1996 and on most of the
standard output alternators from 1997-2004 (3.9/5.2/5.9). You can run down
to a salvage yard and grab the stock 7-rib 61mm for about $5.00.
Just as a comparison, the ASP underdrive pulley is 86mm. It runs really
slow at idle and will drain the battery if you have the A/C on and/or with
headlights and wipers (raining).
- Bernd
-----Original Message-----
From: owner-dakota-truck@bent.twistedbits.net
[mailto:owner-dakota-truck@bent.twistedbits.net] On Behalf Of Rich Werning
Sent: Sunday, May 15, 2005 2:00 AM
To: dakota-truck-moderator@bent.twistedbits.net
Subject: DML: Re: Info please: smaller alternator pulley?
""Bill S."" <kb7vkl@yahoo.com> wrote in message
news:miod811l2itucpeke4eunjmasucff99ssb@4ax.com...
>
> A while back I read that installing a smaller alternator pulley on my
> '04 3.9 Dak will increase alternator output at lower speeds and apply
> less load to the engine. The author of the claim said that it's as
> easy as switching from my OEM pulley to a later model pulley. Can
> anyone here verify that and maybe provide a part number for the later
> pulley that would work?
I can't speak from experience (yet), cause I haven't added this to my
05 Dak yet, but from my research it does seem to help. I've been looking at
http://www.rpmoutlet.com/dodgedasp.htm , but I know that SoCalDakota also
sells them -
http://www.socaldakota.com/performance_mopar_dakotadurangoram_engine_asppull
eys.html
-- - Rich Werning 05 Grey Dak, QC 4x4, 4.7L, Tow Pkg
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