"Whistling" from my 355 engine | FerrariChat
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"Whistling" from my 355 engine

Discussion in '348/355' started by tonyyoshi, May 22, 2006.

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  1. tonyyoshi

    tonyyoshi Formula Junior

    Jan 8, 2005
    308
    Hong Kong
    Full Name:
    Tony Brooker
    #1 tonyyoshi, May 22, 2006
    Just started a few days ago. Sounds like a turbo spool up. Is this the dreaded cracked manifold header? I should add, i can only hear it when i accelerate in 1st and 2nd, but torque seems to be a bit down in 3rd...
     
  2. Crawford

    Crawford Formula 3

    Mar 5, 2003
    1,294
    Nashville, TN
    Full Name:
    Crawford White
    #2 Crawford, May 22, 2006
    I've heard that in my car since I bought it a few months ago...

    Don't think it would be the headers since both of mine had been replaced within the last 2 years.
     
  3. tonyyoshi

    tonyyoshi Formula Junior

    Jan 8, 2005
    308
    Hong Kong
    Full Name:
    Tony Brooker
    #3 tonyyoshi, May 22, 2006
    Could it be the air pump? I've seen a couple of threads mentioning whining noise and the air pump. If it is, do i need to replace it?
     
  4. 348SStb

    348SStb F1 Rookie
    Owner

    Apr 9, 2004
    2,991
    Palm Beach County, FL or Nassau County, NY
    Full Name:
    Dave
    #4 348SStb, May 22, 2006
    I had a constantly pitched whistle at idle and a varying pitched whistle with varying RPMs and it turned out to be a failing bearing.

    It could be a bearing for the alternator belt, the air conditioning belt, or the timing belt. Luckily for me, it wasn't the timing belt bearing -- otherwise I would have had to take engine out of the car to replace the bearing. It turned out to be the alternator bearing...

    Otherwise maybe an air leak?
     
  5. Dr.T348

    Dr.T348 Formula 3

    Jan 8, 2004
    1,599
    Chicago NW Burbs
    Full Name:
    Richard T.
    #5 Dr.T348, May 22, 2006
    I have a similar whistling noise on my 348 only under acceleration at around 3500 - 5500 rpm's. I think it has something to do with the vacuum advance that helps equalize some pressure in the intake plenium. Some others can give you more technical answer but try a search in this forum. It was about 2 months ago that this was discussed.


    Changed some of the small vacuum tubing and no change though. It does not seem to affect performance.
     
  6. Harmonyautosport

    Harmonyautosport Formula Junior

    Apr 28, 2006
    683
    New York
    #6 Harmonyautosport, May 23, 2006
    Ive seen the same sound coming from a VERY small air leak in teh intake manifold gasket. The headers would give you a horrible exhaust leak sound. Try hooking it up to the SD tester and see if it picks anythin gup. If that doesnt work then spray soapy water around the engine bay and hunt for bubbles. But you wont find the solution to this over the internet, go to your local tech.
     

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