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Deep rumble at low speed

Discussion in '348/355' started by Asta, Jun 25, 2015.

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  1. Asta

    Asta Karting

    Mar 29, 2014
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    Rob
    #1 Asta, Jun 25, 2015
    I noticed while driving my new-to-me 355 GTB at low speeds with the window down a low and deep rumble that I thought was distant thunder. I took my first real drive on a day where there were storm clouds in the distance. Then, on subsequent sunny days, I noticed it again.

    Has anyone noticed this? Is it just the engine sucking air?
     
  2. cf355

    cf355 F1 Rookie

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    #2 cf355, Jun 25, 2015
    Without a sound clip its a little hard to comment....however could be anything from a non stock exhaust to a leaking exhaust flange to a failed header.
     
  3. cf355

    cf355 F1 Rookie

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    #3 cf355, Jun 25, 2015
    Can you post a sound clip?
     
  4. Asta

    Asta Karting

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    #4 Asta, Jun 25, 2015
    I'll try to record it. It is very faint, as I say like distant thunder, and can only be discerned while the car is a near idle.
     
  5. kenneyd

    kenneyd Formula 3

    Sep 30, 2014
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    #5 kenneyd, Jun 25, 2015
    If its what i think it is, thats normal and one of the best sounds these cars make.

    When i was a kid, our neighbor had a large stable of ferraris and when we heard that "thunder", we ran to the window to watch

    I assume its off throttle, sub 2500rpm, like when cruising around a neighbor hood at 25mph? thats when mine does it
     
  6. kenneyd

    kenneyd Formula 3

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    #6 kenneyd, Jun 25, 2015
  7. tres55

    tres55 F1 Rookie
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    #7 tres55, Jun 25, 2015
    I love the low RPM range rumble!
     
  8. ///Mike

    ///Mike F1 Veteran

    Dec 11, 2003
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    Bugtussle
    #8 ///Mike, Jun 25, 2015
    Possibly a wheel bearing.
     
  9. eyboro

    eyboro Formula Junior
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    #9 eyboro, Jun 25, 2015
    Last edited by a moderator: Sep 7, 2017
    There is an "air delivery tube" on each side of the engine that sometimes develops a hole that causes like air sucking hissing type of sound, its part # 164300 LH or 164299 RH.
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  10. Asta

    Asta Karting

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    #10 Asta, Jun 30, 2015
    Last edited by a moderator: Sep 7, 2017
    I recorded this while driving slowly in first. You can sort of hear the rumble at 10 and 20 seconds as the revs come off. Hard to hear though.
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  11. Drock28

    Drock28 Formula 3

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    #11 Drock28, Jul 1, 2015
    that sounds normal to me.

    I think you are referring to that bubbly sound as you put in clutch and come off the throttle.

    it's just the exhaust.
     
  12. Enzojr

    Enzojr F1 World Champ

    Dec 12, 2013
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    #12 Enzojr, Jul 1, 2015
    Do you have a stock exhaust or aftermarket ?
     
  13. Asta

    Asta Karting

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    #13 Asta, Jul 1, 2015
    Stock exhaust.
     
  14. 4rePhill

    4rePhill F1 Veteran

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    #14 4rePhill, Jul 2, 2015
    Based on the limited information given by the OP, it sounds as though they're talking about a low engine rpm - lift off/partial throttle rumble from the exhaust.

    My 348 does this, which was of some concern to Me initially until I saw this clip of Jeremy Clarkson in a 348 spider from quite a few years back: https://www.youtube.com/watch?v=jUm0be3reAg (@3:40)
     
  15. ready321now

    ready321now Formula Junior

    Jan 5, 2013
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    #15 ready321now, Jul 9, 2015
    This is the way a Ferrari mechanic from the dealership explain it to me. He said yes what you're hearing is actually thunder. ... It's hot air and cold air mixing together. If we are talking about the same sound, take your foot completely off the pedal as soon as you hear the sound and you will notice it goes away immediately
     

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