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Thread: Underdrives and 10% Crank pulley???

  1. #1
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    Underdrives and 10% Crank pulley???

    Is there a way to run underdrive Water pump and Alternator pulley with A/C delete with the Magnum Powers 10% Crank Pulley? I saw someone say this is not possible but never heard of it before? I am getting ready to get the MP 25% kit and need to know? Thanks in Advance.


    Mark

  2. #2
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    Quote Originally Posted by MagpoweredSC View Post
    Is there a way to run underdrive Water pump and Alternator pulley with A/C delete with the Magnum Powers 10% Crank Pulley? I saw someone say this is not possible but never heard of it before? I am getting ready to get the MP 25% kit and need to know? Thanks in Advance.


    Mark
    Mark,

    The short answer is NO....underdrive water pump pulley (larger diameter than stock) won't fit unless using an underdrive crank pulley (smaller diameter than stock). It won't even fit with a stock crank pulley.

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

  3. #3
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    Thanks Uncle Dave,
    Great now I got to buy yet more stuff. Damn I sold my old pullies years ago. I wonder if anyone sells stock diameter aluminum water pump pulley and alternator pulley?

    Will the Underdrive alternator pulley need to be scrapped too??

    Mark

  4. #4
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    Quote Originally Posted by MagpoweredSC View Post
    Will the Underdrive alternator pulley need to be scrapped too??

    Mark
    I'm running mine...........
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    Last edited by nickleman60; 02-19-2010 at 11:32 PM.
    SCCOA Member #2406
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  5. #5
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    Nice looking engine setup.

    Yup, waterpump pulley will work with the stock belt, but becomes a pretty tight fit. Underdrive waterpump pulley touched my 10% crank!! I wish someone made a underdrive/10%SC OD crank pulley, then we would be good to go.
    Me-89 SC 5-speed 1.7 Autorotor twin screw over 443rwhp 20psi
    Her-95 SC auto 1.7 KB 400rwhp 17psi
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  6. #6
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    Quote Originally Posted by nickleman60 View Post
    I'm running mine...........
    Is that the "Prostreet rich a/c delete" set-up if so what serpentine belt length are you using

  7. #7
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    Quote Originally Posted by MagpoweredSC View Post
    Thanks Uncle Dave,
    Great now I got to buy yet more stuff. Damn I sold my old pullies years ago. I wonder if anyone sells stock diameter aluminum water pump pulley and alternator pulley?

    Will the Underdrive alternator pulley need to be scrapped too??

    Mark
    Underdrive alt pulley will still work, but IMO it's not worth doing. Most of the gains from underdrives come from the crank pulley.

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

  8. #8
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    Quote Originally Posted by MagpoweredSC View Post
    Is that the "Prostreet rich a/c delete" set-up if so what serpentine belt length are you using
    It's the ac delete bracket for a ford truck, can't remember the part number but I got it from someone on these boards, it might have been Rich. The belt is just the stock length belt. I plan on hooking my ac back up once I get all the bugs out and have it running nasty........
    Last edited by nickleman60; 08-20-2008 at 09:29 PM.
    SCCOA Member #2406
    '94 SC AUTO - $$$$ Pit
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  9. #9
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    Quote Originally Posted by David Neibert View Post
    Underdrive alt pulley will still work, but IMO it's not worth doing. Most of the gains from underdrives come from the crank pulley.

    David
    David, I just like the little bit of bling...............

    I have the u/d crank and water pump pullies on my '89, with the way I ran my fmic tubes using the u/d alternator pulley would cause the belt to hit the i/c tube, I didn't facter in a larger pulley when I fabbed up the tubes....
    Last edited by nickleman60; 08-21-2008 at 07:46 AM.
    SCCOA Member #2406
    '94 SC AUTO - $$$$ Pit
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  10. #10
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    Quote Originally Posted by nickleman60 View Post
    David, I just like the little bit of bling...............

    Me too...I bought the MP 10% od crank pulley and then didn't install it because it required giving up my polished underdrives.

    David
    1991 SC AOD 4.2..2.3 Whipple..........10.910 @ 125.61
    2016 SRT Challenger Hellcat...............707HP/650TQ

    My Garage

  11. #11
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    Quote Originally Posted by David Neibert View Post
    Me too...I bought the MP 10% od crank pulley and then didn't install it because it required giving up my polished underdrives.

    David
    You don't need it with an AR...................
    SCCOA Member #2406
    '94 SC AUTO - $$$$ Pit
    http://www.sccoa.com/forums/garage_v..._vehicle&id=19

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