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Open throttle = high pitch hum

Discussion in 'XJ Technical Chat' started by Wayne Cochrane, Jun 1, 2018.

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  1. Wayne Cochrane

    Wayne Cochrane New Member

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    Hey all,

    I’m wondering if there’s any reason why my engine emits a high pitch hum when I open the throttle? I’d love to get to the bottom of this and have a nice healthy growl. Thanks!
     
    Wayne Cochrane, Jun 1, 2018
    #1
  2. k-moe

    k-moe Pie, Bacon, Bourbon. Moderator Premium Member

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    Sound is difficult to diagnose without being able to hear it.
    Please post a video. Make it about a minute long, start at idle, and open the throttle just as if you were going to pull away (no rev, rev, reving).

    The XJ series is known for a distinctive whirring/whistle sound due to the design of the alternator drive. That's probably what you're hearing.
     
    k-moe, Jun 1, 2018
    #2
    kerriskandiesinc, Wayne Cochrane and Toomanybikes like this.
  3. Polock

    Polock Well-Known Member

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    danger, "dad" joke ahead

    because it wants to sing but doesn't know the words !

    you were warned
     
    Polock, Jun 2, 2018
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    Wayne Cochrane, k-moe and Chitwood like this.
  4. Chitwood

    Chitwood Well-Known Member

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    Oh that's classic! Nice one!
     
    Chitwood, Jun 2, 2018
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  5. Wayne Cochrane

    Wayne Cochrane New Member

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    “The XJ series is known for a distinctive whirring/whistle sound due to the design of the alternator drive. That's probably what you're hearing.”

    Even in print this ‘sounds’ (that ones for you @Polock) like you’re on to it @k-moe. I’ll post something asap. Thanks guys!
     
    Wayne Cochrane, Jun 2, 2018
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    kerriskandiesinc likes this.
  6. kerriskandiesinc

    kerriskandiesinc Active Member

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    Yup, as stated a well running XJ, of any capacity, will 'whistle/hum' at speed.....
     
    kerriskandiesinc, Jun 2, 2018
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