Question about 2005 Mini Cooper

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Oversised cranckshaft pulley

I replaced my original cranckshaft pulley with a solid and oversised one 4%(without rubber coupling).Need to know if affection results for the engine.

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  • mecano666 Oct 17, 2008

    i do beleive that the oversised cranckshaft pulley increase the rotation of all attached devices pullies

  • mecano666 Oct 18, 2008

    At least you have the intention for posting solutions regardless if you'r right or wrong.

    Thanks anyway

  • mecano666 Oct 18, 2008

    your reply was highly appreciated.Need to hear your opignon if i'll tell you that this pulley is lighter by 4.5 klg then the original one(sorry for missing mentionning that) specially that my purpose was to let the superchager spin faster at early RPM. Now as i mentioned it befor, this pulley came solid without inner rubber coupling (to reduce vibrations) and i'm worriying if this can damage the crancksaft bearing or any other parts inside the engine

    sorry for miss understanding your point, and hope that your advices can help me making a correct decision,specially that the original pulley is a consumable part and has to be replaced around every 30 000 km with around 400 usd, and the aftermaket one is lifetime guaranteed.



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All parts tied to that pulley would rotate slower .dont know if 4% would have any undue affect on water pump flow or alternator outputs.I dont believe so but keep an eye on temp as it may circulate a little slowerr so it stands to reason it may run warmer.Alternators put out a predetermined amount of power dependant on the speed they are spinning .doubt it would be unduly affected

Posted on Oct 17, 2008

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  • tony yeatman
    tony yeatman Oct 17, 2008

    Do your homework before making a comment only a head would make

  • tony yeatman
    tony yeatman Oct 18, 2008

    I have all and every intention of giving good advice but not when you rate the way you do you have by changing the pulley size increased the total area/size of movement In other words therse more lenght.Am i making sense?.You effectivly change what happens at a specific rev range,The bigger the pulley the slower you rev The smaller the pulley the faster you rev at your specific rev range.These days its all worked out so that things spin at specific times for specific reasons.

  • tony yeatman
    tony yeatman Oct 18, 2008

    Thanx for your reply its agood thing we are friends LoL!its all good Anyway back to the matter at hand.You will of course have to get the complete rotating assembly balanced because if you have no dampening that engine will let go impressivly.Im not sure why you would risk an engine by changing all the pulley ranges when getting a higher boost out of the super charger or changing the super charger pulley would have been an easier option.Maybe go see the supercharger wizzes to see how to make the charger perform better dont know myself .Anyway good luck and hope you come out on top.

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