Results 1 to 17 of 17

Thread: Alternator overdrive pulley cross-reference?

  1. #1
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
    Join Date
    Nov 2010
    Location
    Raleigh Area, NC
    Posts
    4,809

    Alternator overdrive pulley cross-reference?

    Doing some testing with MeanMini and trying out the underdrive crank pulley again. But, to avoid the low voltage issues (especially with lights and fan on)i would like to speed up the alternator.
    Does anyone know the application to get the alt pulley from for 89 common block 2.5 8v?

    I can't remember who mentioned and can't find it in search. Might have been Simon.
    The overdrive alt pulley should be smaller, right? Or is it larger? I did see it described both ways in search results.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  2. #2
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
    Join Date
    Dec 2005
    Location
    Tuscola, IL
    Posts
    21,441

    Re: Alternator overdrive pulley cross-reference?

    An overdrive pully for the alt should be smaller.

  3. #3
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
    Join Date
    Nov 2010
    Location
    Raleigh Area, NC
    Posts
    4,809

    Re: Alternator overdrive pulley cross-reference?

    Quote Originally Posted by cordes View Post
    An overdrive pully for the alt should be smaller.
    That's what i thought.
    Some search results indicate larger, but that didn't seem to make sense.

    Just need the right donor pulley now...
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  4. #4
    Super Moderator Turbo Mopar Staff contraption22's Avatar
    Join Date
    Dec 2005
    Location
    Havertown, PA
    Posts
    9,517

    Re: Alternator overdrive pulley cross-reference?

    I remember Simon had suggested a pulley from a Toyota MR2. I do not remember the year or engine. It was a 6 rib. Should work fine on a 4 rib belt
    Mike Marra
    1986 Plymouth Horizon GLMF "The Contraption" < entertaining sponsorship offers
    Project Log:
    http://www.turbo-mopar.com/forums/showthread.php?69708-The-Contraption-2013-14&highlight=

  5. #5
    turbo addict
    Join Date
    Jan 2006
    Location
    Hazelwood, MO
    Posts
    6,566

    Re: Alternator overdrive pulley cross-reference?

    I was going to say the same thing. I could swear there's a Toyota pulley that fits, but it is more ribs. Part of the reason I never went looking for it.

  6. #6
    Hybrid booster Turbo Mopar Contributor
    Join Date
    Apr 2008
    Location
    long island
    Posts
    333

    Re: Alternator overdrive pulley cross-reference?

    Are you sure your alternator is functioning at a 100 percent? Chrysler was one of the first to start using over 100 amp plus alternator's which is more than adequate to keep up with the load.
    [SIGPIC][/SIGPIC] 86 Daytona Turbo Z C/S with a full 89 Shelby swap, back on the road and soon to be painted (and lose that Oggie Fisher black) 83 Porsche 944, 5 speed, all stock. 2014 Toyota Tacoma 4x4, 5 speed, daily driver. 2017 Trek 1.2 bicycle.

  7. #7
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
    Join Date
    Nov 2010
    Location
    Raleigh Area, NC
    Posts
    4,809

    Re: Alternator overdrive pulley cross-reference?

    Quote Originally Posted by marc View Post
    Are you sure your alternator is functioning at a 100 percent? Chrysler was one of the first to start using over 100 amp plus alternator's which is more than adequate to keep up with the load.
    It can keep up with the load just fine, when the rpm's are over 1000 - 1100 or so.
    It is fine with the stock crank pulley. This is a common issue when using an underdrive crank pulley.

    Sent from my SAMSUNG-SM-G870A using Tapatalk
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  8. #8
    Super Moderator Turbo Mopar Staff contraption22's Avatar
    Join Date
    Dec 2005
    Location
    Havertown, PA
    Posts
    9,517

    Re: Alternator overdrive pulley cross-reference?

    Mike Marra
    1986 Plymouth Horizon GLMF "The Contraption" < entertaining sponsorship offers
    Project Log:
    http://www.turbo-mopar.com/forums/showthread.php?69708-The-Contraption-2013-14&highlight=

  9. #9
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
    Join Date
    Nov 2010
    Location
    Raleigh Area, NC
    Posts
    4,809

    Re: Alternator overdrive pulley cross-reference?

    Quote Originally Posted by contraption22 View Post
    That's great info Mike. Thanks!
    I'll measure up the current pulley and see which one might be best. But the do have one available that is about 2" diameter. Not sure what the current one measures.

    Then likely i will have to mess with different bushing sleaves to get the proper alignment. Not looking forward to that, since it has been tough enough trying to resolve an alt belt squeak with the stock stuff.

    But that list is very helpful!
    :beer:
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  10. #10
    Super Moderator Turbo Mopar Staff contraption22's Avatar
    Join Date
    Dec 2005
    Location
    Havertown, PA
    Posts
    9,517

    Re: Alternator overdrive pulley cross-reference?

    From the listings it looks like the ND for our cars had a 17mm hub.

    It would be cool if somebody offered blank 4 rib pulleys that could easily be machined for whatever hub you wanted.

    The problem you will have with a smaller pulley is that you will have even less belt contact. If you're not running A/C, it might be possible to add an idler somewhere to increase belt wrap around both the water pump and alternator. I did that when I relocated the alternator on my 2.2.
    Mike Marra
    1986 Plymouth Horizon GLMF "The Contraption" < entertaining sponsorship offers
    Project Log:
    http://www.turbo-mopar.com/forums/showthread.php?69708-The-Contraption-2013-14&highlight=

  11. #11
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
    Join Date
    Nov 2010
    Location
    Raleigh Area, NC
    Posts
    4,809

    Re: Alternator overdrive pulley cross-reference?

    So i had a fun afternoon.
    Went to the pick-a-part and scouted for the a/c temperature switch connector i needed, as well as looking all through the yard at alternator pulleys.

    Found my connector, and didn't even need to feel guilty about cutting it out of a perfectly good harness. Harness was slready gone, but they had cut it at the connector just where i would have to!

    Checked out all brands looking for a pulley that was smaller. Found 2, both from Mazda's.
    Don't know what years, but got one from a 929 24v V6 that was smaller than mine, as well as one from a 626 I4 that was even smaller.
    Here's the line up. From the left, the starting point off the van, the gold one is one from a spare alternator i have, then the 929, then the 626.
    Click image for larger version. 

Name:	uploadfromtaptalk1462407547981.jpg 
Views:	134 
Size:	54.9 KB 
ID:	58124
    I measured each at the outer diameter as well as the tip of the rib.
    Click image for larger version. 

Name:	uploadfromtaptalk1462407958231.jpg 
Views:	109 
Size:	31.7 KB 
ID:	58125

    Comparing the cross-section profile of the pulleys concluded the smallest pulley might be the exact take out dimension so i wouldn't have to screw with realigning the alt. And since i wanted at least 10% smaller, that was the best one to try.

    After installing, let the car warm up and checked the running voltage at idle; with lights; with lights and blower; with lights, blower and fan.
    And then the same in drive.
    Voltage is good except in gear with lights, fan, and blower all on at same time.
    The waterpump has enough belt bite by the feel of it. I might be able to tension it just a bit more, but i don't like to go too tight with it. I always use the waterpump pulley as my belt tension check.

    If/when i install the CSR waterpump, i will just keep the underdrive crank pulley on, now that the alternator speed seems good. That will free up a few ponies from the reduced rotating weight and less parasitic loss.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  12. #12
    Super Moderator Turbo Mopar Staff contraption22's Avatar
    Join Date
    Dec 2005
    Location
    Havertown, PA
    Posts
    9,517

    Re: Alternator overdrive pulley cross-reference?

    Sweet! Do you remember the year of the 929?
    Mike Marra
    1986 Plymouth Horizon GLMF "The Contraption" < entertaining sponsorship offers
    Project Log:
    http://www.turbo-mopar.com/forums/showthread.php?69708-The-Contraption-2013-14&highlight=

  13. #13
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
    Join Date
    Nov 2010
    Location
    Raleigh Area, NC
    Posts
    4,809

    Re: Alternator overdrive pulley cross-reference?

    I forgot to take a look at the emissions tag.
    But it looked like this.
    https://upload.wikimedia.org/wikiped...Mazda_929_.jpg

    I still have that pulley, but to use i would have to get it machined a bit to use without messing with the belt alignment.
    Last edited by wheming; 05-04-2016 at 10:59 PM.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  14. #14
    Super Moderator Turbo Mopar Staff contraption22's Avatar
    Join Date
    Dec 2005
    Location
    Havertown, PA
    Posts
    9,517

    Re: Alternator overdrive pulley cross-reference?

    Sorry I misread. You ended up using the one from the 626 I see.
    Mike Marra
    1986 Plymouth Horizon GLMF "The Contraption" < entertaining sponsorship offers
    Project Log:
    http://www.turbo-mopar.com/forums/showthread.php?69708-The-Contraption-2013-14&highlight=

  15. #15
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
    Join Date
    Nov 2010
    Location
    Raleigh Area, NC
    Posts
    4,809

    Re: Alternator overdrive pulley cross-reference?

    Quote Originally Posted by contraption22 View Post
    Sorry I misread. You ended up using the one from the 626 I see.
    Yes.
    I thought you might have mixed up. But then i thought you might have been interested in that one based on sizing.

    The 4cyl engine was a pain in the $@€× the get the alt out. And alt nut was right at the unibody, so impossible to get a socket wrench on.


    I think this is the same one here. I'm guessing it was off about a 98ish 2.0 4cyl.
    http://pages.ebay.com/link/?nav=item...&alt=web<br />
    Last edited by wheming; 05-05-2016 at 10:17 AM.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

  16. #16
    turbo addict
    Join Date
    Mar 2014
    Location
    Toronto Canada
    Posts
    1,772

    Re: Alternator overdrive pulley cross-reference?

    I would think swaping in the electric water pump should improve the belt wrap on the alt pulley as the lower part of the belt will be bending around the pulley more to go back to the crank rather than down to the pump pulley

    I'd really like to see a pic once the pump gets swaped in as I have one on stash too - I've been wondering about the pump motor and the belt placement and what it'll all look like bolted together

    do you have any notiable difference in the power steering with the small crank pulley ?

  17. #17
    Slugmobile & MeanMini Caretaker Turbo Mopar Contributor wheming's Avatar
    Join Date
    Nov 2010
    Location
    Raleigh Area, NC
    Posts
    4,809

    Re: Alternator overdrive pulley cross-reference?

    Quote Originally Posted by Dr. Johny Dodge View Post
    I would think swaping in the electric water pump should improve the belt wrap on the alt pulley as the lower part of the belt will be bending around the pulley more to go back to the crank rather than down to the pump pulley

    I'd really like to see a pic once the pump gets swaped in as I have one on stash too - I've been wondering about the pump motor and the belt placement and what it'll all look like bolted together

    do you have any notiable difference in the power steering with the small crank pulley ?
    For the early pumps yes. The common block pump, no.
    The common block has a reverse rotating pump which backside of the belt rides on the pulley increasing belt wrap on alt.

    Power steering worked fine with the smaller crank pully. There might be less difference in size of the power steering pulley compared to the alt and a/c.
    I have not put an a/c belt on yet to try it. Never got the converted R134a a/c working 100% as it should yet.

    One of the group buy members posted a pic in the thread showing the belt placement and electric motor clearance.
    Wayne H.

    '91 Dodge Spirit ES 2.5L turbo 5spd
    '05 PT GT 2.4T HO autostick (RIP)
    '89 Plymouth Acclaim 2.5L turbo auto, "Slugmobile" yes, THE Slugmobile!
    '89 Dodge Caravan SE 2.5L turbo auto, "Mean Mini" yes, Gus' Mean Mini! (Current best 11.699 @ 114.43 mph! - Oct 15th, 2022 Cecil County Dragway, MD)
    MeanMini dragracing videos: https://www.youtube.com/playlist?lis...URZLB1RxGYF6vw
    and other cars, trucks and motorcycles
    https://www.youtube.com/user/SlugmobileMeanMini

Similar Threads

  1. Nice sparkplug cross reference site...
    By ShelGame in forum EFI Tuning
    Replies: 1
    Last Post: 07-31-2012, 04:05 PM
  2. autolite cross reference question
    By Badger in forum Maintenance & General Tech
    Replies: 6
    Last Post: 07-16-2012, 01:18 PM
  3. Light bulb "cross" reference chart?
    By lametec in forum Electrical & Fuel System
    Replies: 5
    Last Post: 11-01-2008, 10:30 AM
  4. Underdrive/overdrive pulley help!
    By turbovanman² in forum Maintenance & General Tech
    Replies: 6
    Last Post: 05-22-2008, 02:25 AM
  5. cross reference for an 87 lebaron
    By Dodgeglht in forum "I need help!"
    Replies: 8
    Last Post: 07-24-2007, 10:20 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •