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    Aug 15, 2005 10:50:11 AM

    Rich C (UK)
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    Rich C (UK)
    Loc: Mortimer, UK
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    Registered on: Jul 11, 2004

    Resonance

    OK, as many of you know I go the Friday afternoon car - lot's of minor rattles - nothing serious but lots of annoyances.

    Anyway, the latest is a resonation from the left side (intake) side of the engine bay when the engine is cold 2000-2100 rpm, mainly on a trailing throttle.

    A couple of other people on another board have experienced something similar (heatshields etc. have been checked, one guy even had his oil pump replace as it may have been cavatation (sp?) ) and Porsche are supposeldy looking into it.

    Anyone here had the same problem? Sounds horrible for the brief time its happening - and (surprisingly!!) it's didn't do it when the dealer had it!

    Aug 15, 2005 11:25:02 AM

    dreamcar
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    dreamcar
    Loc: Hampshire , United Kingdom
    Posts: 8800, Gallery
    Registered on: Apr 19, 2004
    Reply to: Rich C (UK)

    Re: Resonance

    Cavitation. Minute air bubbles / vortices normally on the back side of the impeller vanes causes the noise. At least it does on ship's pumps and propellers. You may notice on car ferries when manoeuvring close to the berth heavy vibrations when propeller(s) going in opposite direction to that of the ship . That's cavitation big-style. So I guess it's similar on automotive oil pumps maybe when the oil is viscous and cold except I sincerely hope your pump is not going backwards . Here endeth today's lesson, except that in Germany your car would be a Montag car.
    And not surprisingly it's not happened (yet!) on my car.

    Aug 15, 2005 12:34:33 PM

    JZ
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    JZ
    Loc: London, UK , United Kingdom
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    Reply to: dreamcar

    Re: Resonance

    So my car is being built on a Thursday (25th Aug). Is that a good or bad day in Finland??

    Cheers,

    JZ

    Aug 15, 2005 1:42:03 PM

    dreamcar
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    dreamcar
    Loc: Hampshire , United Kingdom
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    Reply to: JZ

    Re: Resonance

    Quote:
    JZ said:
    So my car is being built on a Thursday (25th Aug). Is that a good or bad day in Finland??

    Cheers,

    JZ



    Better than a Friday car in the UK or a Monday car in Germany. I think. Ask Rich C what day his car was built - if it was a Thursday, cancel your order

    Aug 15, 2005 1:55:20 PM

    Rich C (UK)
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    Rich C (UK)
    Loc: Mortimer, UK
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    Registered on: Jul 11, 2004
    Reply to: dreamcar

    Re: Resonance

    Quote:
    dreamcar said:
    Quote:
    JZ said:
    So my car is being built on a Thursday (25th Aug). Is that a good or bad day in Finland??

    Cheers,

    JZ



    Better than a Friday car in the UK or a Monday car in Germany. I think. Ask Rich C what day his car was built - if it was a Thursday, cancel your order



    I think mine must have been built on the 'take you kiddies to work' day, getting a bit frustrating, especially as my last one was so well screwed together, and those I meet on our Rennteam excursions seem to be well put together too. Ho, hum, next business jaunt the car is going to be left with the OPC for an extended stay....

    But, on a surprise note, the OPC had by far the lowest quote to refurb the wheel I kerbed the other day - go figure...

    Aug 15, 2005 2:31:10 PM

    dreamcar
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    dreamcar
    Loc: Hampshire , United Kingdom
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    Reply to: Rich C (UK)

    Re: Resonance

    Quote:
    Rich C (UK) said:
    Ho, hum, next business jaunt the car is going to be left with the OPC for an extended stay....




    Hopefully you'll be around complete with car for our New Forest Meet provisionally 25th September. More details this weekend after I've completed my research.

    Aug 15, 2005 3:37:48 PM

    Ente
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    Ente
    Loc: Germany , Germany
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    Registered on: Mar 24, 2005
    Reply to: dreamcar

    Re: Resonance

    Only one way to deal with neverending rattles - turn the Bose up!

    Dreamcar: 25th sounds good.

    Aug 15, 2005 3:39:50 PM

    Rich C (UK)
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    Rich C (UK)
    Loc: Mortimer, UK
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    Reply to: Ente

    Re: Resonance

    Quote:
    Ente said:
    Only one way to deal with neverending rattles - turn the Bose up!




    Ahh, but did I mention the dash speaker that reverberating...?

    Aug 15, 2005 4:10:25 PM

    RichJ
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    RichJ
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    Reply to: dreamcar

    Re: Resonance

    Wondering if mine was actually used for crash testing! as its now starting to show a few more problems as the miles go on.. Wind deflector rattles like hell, passenger doors bose speakers looks as though its come away a bit and on Friday was buzzing like mad as I was on the motorway! Also I think my auto heater isnt working either!!!! GGGggrrrrR!!!!


    Hey Rich C how much did they qoute you for the refurb????

    Bird took the motor to work and curbed the front left.... I managed to curb both the rears, whilst parking!!! Monkey!

    Aug 15, 2005 4:26:03 PM

    dreamcar
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    dreamcar
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    Reply to: Rich C (UK)

    Re: Resonance

    Quote:
    Rich C (UK) said:
    I think mine must have been built on the 'take you kiddies to work' day, getting a bit frustrating, especially as my last one was so well screwed together



    I've usually found that if I've had a particular car and been really pleased with it and I've had another one of the same model it has never been as good second time round. Ah well, I almost certainly won't be able to justify another Porsche when this one goes, maybe just as well.

    Aug 15, 2005 4:48:32 PM

    Dr. Phil Offline
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    Dr. Phil
    Loc: Denmark , Denmark
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    Reply to: RichJ

    Re: Resonance

    This one is even worse than just getting a bad friday car.
    Check this hilarious commercial:
    http://www.joe-ks.com/MultiMedia/NailGun.mpeg

    Aug 15, 2005 8:09:06 PM

    dreamcar
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    dreamcar
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    Reply to: Ente

    Re: Resonance

    Quote:
    Ente said:
    Only one way to deal with neverending rattles - turn the Bose up!



    Au contraire - change down a gear and press harder on the loud pedal

    Aug 16, 2005 8:24:40 AM

    Rich C (UK)
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    Rich C (UK)
    Loc: Mortimer, UK
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    Registered on: Jul 11, 2004
    Reply to: RichJ

    Re: Resonance

    Quote:
    RichJ said:

    Hey Rich C how much did they qoute you for the refurb????





    50 squiddies, unsure whether that with or without VAT but everyone else was at least Pounds65+VAT, or Pounds55+VAT but I had to take the wheel off and they then sent it away, so the OPC wins hands down.

    Aug 16, 2005 8:27:07 AM

    Rich C (UK)
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    Rich C (UK)
    Loc: Mortimer, UK
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    Reply to: dreamcar

    Re: Resonance

    Quote:
    dreamcar said:

    I've usually found that if I've had a particular car and been really pleased with it and I've had another one of the same model it has never been as good second time round.



    I hear what you're saying, although as a total package I much prefer this one over my old 986S, it's just the niggly bits that didn't rattle on the old car, or your guys cars, that drive me spare.

    Aug 16, 2005 9:06:39 AM

    JZ
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    JZ
    Loc: London, UK , United Kingdom
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    Reply to: Rich C (UK)

    Re: Resonance

    Pencil me in for the 25th. I should have the car by then and should be back in the South. It all depends on my work roster for next month (out later this week), so will keep you informed.

    Cheers,

    JZ

    Aug 16, 2005 10:25:53 AM

    derder
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    derder
    Loc: Australia , Australia
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    Reply to: JZ

    Re: Resonance

    I have the same problem.

    only when cold and around 2200 rpm as u stated.

    apparently its a common problem, tho i hv yet to find time to bring it back to the dealers. no big deal it think....

    http://forums.rennlist.com/rennforums/showthread.php?t=220803

    hope someone will shed some light on this.

    Aug 16, 2005 10:50:54 AM

    JZ
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    JZ
    Loc: London, UK , United Kingdom
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    Reply to: derder

    Re: Resonance

    Stab in the dark, but resonant frequencies that occur at specific rev ranges seem to hint at one particular part (with the same resonant frequency as the engine as that particular rpm).

    The fact that this one part only resonates when cold, suggests that it expands with time (and therefore heat) making a tighter fit, therefore no resonance.

    So,it could possibly be a part of the exhaust system, or some other part which has to heat up during use.

    Off course, I could be completely wrong......

    Aug 16, 2005 11:48:40 AM

    Steve R
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    Steve R
    Loc: UK - Edinburgh
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    Reply to: dreamcar

    Re: Resonance

    25th of Aug build date should be Germany!!

    Aug 16, 2005 2:25:15 PM

    JZ
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    JZ
    Loc: London, UK , United Kingdom
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    Reply to: Steve R

    Re: Resonance

    Quote:
    Steve R said:
    25th of Aug build date should be Germany!!



    How so? Is that cos of the factory shutdown? If so, I thought boht factories closed for the same 2 weeks at the start of August?

    Cheers,

    JZ

    Aug 19, 2005 11:04:55 PM

    pols
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    pols
    Loc: ireland
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    Registered on: Mar 20, 2005
    Reply to: JZ

    Re: Resonance

    Quote:
    JZ said:
    Stab in the dark, but resonant frequencies that occur at specific rev ranges seem to hint at one particular part (with the same resonant frequency as the engine as that particular rpm).

    The fact that this one part only resonates when cold, suggests that it expands with time (and therefore heat) making a tighter fit, therefore no resonance.

    So,it could possibly be a part of the exhaust system, or some other part which has to heat up during use.

    Off course, I could be completely wrong......



    Mine stated that @ 1200 miles & again disapears when temp is at normal, sounds like it comes from exhaust but not sure.

    Aug 20, 2005 9:25:56 AM

    Steve R
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    Steve R
    Loc: UK - Edinburgh
    Posts: 695, Gallery
    Registered on: Feb 17, 2005
    Reply to: JZ

    Re: Resonance

    Quote:
    JZ said:
    Quote:
    Steve R said:
    25th of Aug build date should be Germany!!



    How so? Is that cos of the factory shutdown? If so, I thought boht factories closed for the same 2 weeks at the start of August?

    Cheers,

    JZ



    Pretty sure most of August build cars are Stuttgart! Finalnd closes in August as far as I know and there is a limited build in Germany. Could be wrong though!

    Aug 21, 2005 6:04:57 PM

    mcdelaug
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    mcdelaug
    Loc: Fort Worth, Texas , United States
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    Reply to: Steve R

    Re: Resonance

    I'm not sure what the month breakdown is, but my June '05 car was built in Stuttgart.

    mcdelaug

    Sep 9, 2005 9:10:28 AM

    Rich C (UK)
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    Rich C (UK)
    Loc: Mortimer, UK
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    Reply to: dreamcar

    Resonance - fixed?

    OK Guys, update from my OPC as the car was in this week.

    Porsche have released a technical bulletin in the past couple of days relating to this problem.

    Seems to be caused by the oil pressure relief valve, the solution is to replace this and all associated parts - had this done on my car, will eport back whether it's worked or not when I get back from Milan this evening.. fingers crossed!

    Sep 9, 2005 9:38:03 AM

    wtsnet
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    wtsnet
    Loc: Bath, UK
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    Reply to: Rich C (UK)

    Re: Resonance - fixed?

    If it fixes it, might be worth adding a summary post to the 'run-in issues' sticky thread.

    Got two (minor) noises myself. One rattle in the glovebox area, and a low jiggling/knocking sound from somewhere behind. What sort of noise does a loose heatshield make? Is it subtle, or obvious?

    Sep 9, 2005 10:07:56 AM

    Ente
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    Ente
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    Reply to: wtsnet

    Re: Resonance - fixed?

    Thanks for the update Rich. It might turn into a workshop item which is taken care of automatically as cars arrive for service work.

    Dunno WTS... still no rattles here *jinxxxxxx*.

    Sep 9, 2005 10:18:14 AM

    Rich C (UK)
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    Rich C (UK)
    Loc: Mortimer, UK
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    Reply to: Ente

    Re: Resonance - fixed?

    Quote:
    Ente said:
    Thanks for the update Rich. It might turn into a workshop item which is taken care of automatically as cars arrive for service work.

    Dunno WTS... still no rattles here *jinxxxxxx*.



    If I remember correctly the bulletin said ' a few cars effected' so unlikely they'll be changing them all as a mater of course - be waiting for the customer to indicate the problem first I would think.

    Still know of more cars with no problems than those with any (minor ones) so don't fret.....

    Sep 9, 2005 9:36:01 PM

    edracer
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    edracer
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    Reply to: Steve R

    Re: Resonance

    They fixed my 987 rattle at 2100 rpm by relacing the engine! Having to go through the run in progress again.

    Ed

    Sep 10, 2005 1:27:16 AM

    pols
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    pols
    Loc: ireland
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    Registered on: Mar 20, 2005
    Reply to: Rich C (UK)

    Re: Resonance - fixed?

    Quote:
    Rich C (UK) said:
    OK Guys, update from my OPC as the car was in this week.

    Porsche have released a technical bulletin in the past couple of days relating to this problem.

    Seems to be caused by the oil pressure relief valve, the solution is to replace this and all associated parts - had this done on my car, will eport back whether it's worked or not when I get back from Milan this evening.. fingers crossed!


    Mine just back from OPC after replacing Speedo binacle, they also did some recall work?? while in but resonance is still there. When I picked it up tech had gone for day so not sure what the recall work was. I'll call on monday & find out - also ask about noise,

    Sep 13, 2005 6:35:39 PM

    Rich C (UK)
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    Reply to: Rich C (UK)

    Re: Resonance - NOT fixed!!!

    Didn't notice it at the weekend = but a quiet drive this evening showed that the problems still there.

    Really pee'd off - beginning to wonder with all the issues, not matter how minor,or not, if I ought to think about rejecting it.... bugger!

    Sep 13, 2005 7:16:25 PM

    wtsnet
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    wtsnet
    Loc: Bath, UK
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    Reply to: Rich C (UK)

    Re: Resonance - NOT fixed!!!

    Oh no! Try taking it to a different OPC?
     
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