4 5/8" alternator pulley

Discussion in 'The Garage' started by 96blak54, Jun 9, 2016.

  1. 96blak54

    96blak54 Legend

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    Any you guys be intrested in a custom alternator pulley thats over 4.625" in over all diameter?

    Purpose of a giant alt pulley is to severely underdrive the alternator when drag racing. An alts full output is normally around cruising rpms...something like +2000 engine rpm's. No reason to speed the alt into oblivion gyroscoptic range when the engines rpm never gets below 7grand.

    Whats it worth? Im thinking $150ea is fair. Whats you guys input?
     
  2. 96blak54

    96blak54 Legend

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    [​IMG]
     
  3. ttocs

    ttocs Legend

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    I don't see it adding much hp but if it was not used on a drag only car I could see it causing some heat problems in the alt for prolonged use
     
  4. 96blak54

    96blak54 Legend

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    Bingo!
    This is more for a trailer queen track car.

    Im poking around just to see what members bite.
     
  5. 96blak54

    96blak54 Legend

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    Nobody here have a dedicated track car?
     
  6. DropTopPony

    DropTopPony Administrator Staff Member Admin SN95 Supporter

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    ASP would probably cut that for someone for @ $100 or slightly less. My SVO supercharger pulleys were $85 and very nice quality.

    $150 price point might prohibit potential buyers from jumping on board a good idea.
     
  7. 96blak54

    96blak54 Legend

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    Good answer! Yea that company is set up mainly for pulleys and can do a good turn-around for not alot of money. Honestly though, I had figured to sell these pulleys at $85ea.
     
  8. lwarrior1016

    lwarrior1016 Moderator Staff SN95 Supporter

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    How would this this cause heat problems with the alternator?
     
  9. ttocs

    ttocs Legend

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    The alt is designed to pull air into it as it spins to cool its self. When you slow it down you can increase the heat it develops because the load it has to support is the same while it now has less air to cool itself. As long as its on a drag car going at redline then it will pull the same amount of air but sit and idle like any street car does and your asking for alt problems.
     
  10. 96blak54

    96blak54 Legend

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    ttocs.....never thought of the alternators condition in that scenario. Guess the factory has it all worked out for us.

    I would think a circuit racing car could benefit from something of the like as well. Since top redline is where the rpms are at. Big pulley like this might just be the edge these stricked classed cars need.
     
  11. ttocs

    ttocs Legend

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    at some point every little bit matters.
     
  12. Ballistic

    Ballistic Active Member

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    I had my alternator rebuilt and upped to almost 200amps, and it started going crazy and had to take it back in few months later, after the dude dug into (shop is very credible) he called me and was like between you and me are you street racing or something? Cant remember what it broke, but he said if it does it again we would need to slow down the alternator..

    So i could see these being useful, especially if you're doing a lot of racing. and they look pretty good!