What actually makes the buzzing sound on | FerrariChat
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What actually makes the buzzing sound on

Discussion in '348/355' started by cladd2000, Oct 24, 2011.

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  1. cladd2000

    cladd2000 Formula Junior
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    #1 cladd2000, Oct 24, 2011
    A bypass valve? Someone said that it is the stem meeting the turn mechanism. Can anyone confirm?
     
  2. gothspeed

    gothspeed F1 World Champ

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    #2 gothspeed, Oct 24, 2011
    If it still rattles once there is sufficient preload from the actuator shaft, then most certainly it is the butterfly shaft is loose in the butterfly body. As the gap between the shaft and the body gets larger with use.
     
  3. gothspeed

    gothspeed F1 World Champ

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    #3 gothspeed, Oct 24, 2011
    Last edited by a moderator: Sep 7, 2017
  4. TxEddie1111

    TxEddie1111 Formula Junior

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    #4 TxEddie1111, Oct 25, 2011
    ...maybe you should start a sideline revenue stream!

    BTW, I love the bikes...sweet.
     
  5. cladd2000

    cladd2000 Formula Junior
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    #5 cladd2000, Oct 25, 2011
    So it looks like you created artificial preload with a spring
     
  6. gothspeed

    gothspeed F1 World Champ

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    #6 gothspeed, Oct 25, 2011
    Yeah, there was a thread a while back with a similar 'buzz kill' ;). It is a 'stop the bleeding' kinda fix, that will prevent the moving parts from vibrating. It puts a tad lateral preload on the butterfly shaft. The added shaft with bronze bearing reduces some of the added friction, so the actuator is not burdened excessively. It is not a perfect solution but IMO slightly better than letting the valve rattle away :eek:.
     

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