[928uk] Advice and parts - intake tubes
kenworthy
sandy at sakenworthy.plus.com
Sat Jun 8 21:50:16 UTC 2024
Hi Simon,
Sent you an email regarding intake tubes, did you not receive it?
Regards,
Duncan
79 928 auto
On 2024-06-08 21:31, Simon Watson via 928uk wrote:
> Intake noise is good! In my opinion. And on BMW M3 e46 cars when
> fitted with the CSL air box. It sounds amazing!
> Thanks for the information Smiffy, I never knew that and had always
> wondered why the 928 has the strangely shape tubes.
> Best Simon
> Sent from my iPhone
>
>> On 8 Jun 2024, at 20:07, Paul R Smith via 928uk
>> <928uk at lists.928.org.uk> wrote:
>>
>> Correct, from the 1981 service tech info:
>> "These tubes are now designed as venturi nozzles to effectively dampen
>> the engine’s intake noise.
>> Due to the aerodynamic shape the air stream is not restricted.
>> Sound waves, which are pressure impulses from the engine against the
>> direction of air stream flow,
>> are reflected “inward” on the inside walls of the tapered nozzles and
>> prevented from reaching the
>> intake opening in the car’s front end.
>> As on earlier models air is drawn from housing (2) through opening (1)
>> for cooling of the toothed
>> belt (3)."
>>
>> I suspect only test equipment can detect the difference in the noise.
>>
>> Smiffy
>>
>>> On 08/06/2024 19:42, Ben Hodges wrote:
>>> Isn’t the Venturi shape of the plastic ones an attempt to reduce
>>> noise too?
>>>
>>> On Sat, 8 Jun 2024 at 18:48, Simon Crowe via 928uk
>>> <928uk at lists.928.org.uk> wrote:
>>>
>>> I could never hear any difference between the plastic on my S4 and
>>> the foam on my GTS.
>>>
>>> When they did finally fall apart (I think the inner wires rusted
>>> heavily and the foam detached itself) I bought a pair of
>>> plastic/rubber hoses from an Italian company, specially designed
>>> for the 928. A perfect fit and I still have them.
>>>
>>>
>>>
>>> > On 8 Jun 2024, at 18:15, Paul R Smith via 928uk
>>> <928uk at lists.928.org.uk> wrote:
>>> >
>>> > According to PET, they started in 1987 for Switzerland, 1992
>>> for all markets.
>>> >
>>> > Smiffy
>>> >
>>> >> On 08/06/2024 17:25, phil rick via 928uk wrote:
>>> >> learn something new every day, i thought the crap foam hoses
>>> only came with
>>> >> the GTS, but must have started on the 91 model year
>>> >>
>>> >> On Sat, Jun 8, 2024 at 5:21 PM jonathanrackowe--- via 928uk <
>>> >> 928uk at lists.928.org.uk> wrote:
>>> >>
>>> >>> Oh yes, thanks, I'd forgotten that. Can't say I noticed any
>>> difference in
>>> >>> noise level when I fitted the Samco silicone tubes, but maybe
>>> that's due to
>>> >>> my de-catted custom exhaust system! :-D
>>> >>>
>>> >>> Best regards,
>>> >>> Jonathan
>>> >>>
>>> >>> West London, England
>>> >>>
>>> >>> 1991 928 GT Amethyst Metallic with Blueflame custom exhaust
>>> and Porsche
>>> >>> 18" Sport Design wheels
>>> >>>
>>> >>>
>>> >>>
>>> >>> -----Original Message-----
>>> >>> From: 928uk<928uk-bounces at lists.928.org.uk> On Behalf Of Paul
>>> R Smith
>>> >>> via 928uk
>>> >>> Sent: 08 June 2024 15:24
>>> >>> To:928uk at lists.928.org.uk <mailto:To%3A928uk at lists.928.org.uk>
>>> >>> Subject: Re: [928uk] Advice and parts - intake tubes
>>> >>>
>>> >>> The official reason for the foam hoses was to reduce noise:
>>> >>> "All 928 GTS vehicles are fitted with noise-reducing intake
>>> hoses of the
>>> >>> same type used previously on export vehicles
>>> >>> for Switzerland."
>>> >>> From the 1992 service tech info document.
>>> >>>
>>> >>> Smiffy
>>> >>>
>>> >>> On 08/06/2024 14:07, jonathanrackowe--- via 928uk wrote:
>>> >>>> My 928 GT has a pair of Samco SHL77 Silicone Hoses 77x640mm
>>> installed -
>>> >>> that
>>> >>>> I fitted back in 2006. They're still perfect.
>>> >>>>
>>> >>>> The foam hoses that Porsche fitted to the 928 GT and GTS were
>>> rubbish!
>>> >>> The
>>> >>>> insulation was intended to keep the intake air cool, but it
>>> disintegrated
>>> >>>> badly. Given the speed of the air rushing into the 32V V8
>>> engine I doubt
>>> >>>> that the foam hoses made any significant difference to the
>>> intake air
>>> >>>> temperature anyway.
>>> >>>>
>>> >>>> Best regards,
>>> >>>> Jonathan
>>> >>>>
>>> >>>> 1991 928 GT Amethyst Metallic
>>> >>>>
>>> >>>>
>>> >>>>
>>> >>>> -----Original Message-----
>>> >>>> From: 928uk<928uk-bounces at lists.928.org.uk> On Behalf Of Ian
>>> Marsh via
>>> >>>> 928uk
>>> >>>> Sent: 07 June 2024 16:06
>>> >>>> To: 'Cengiz Ali'<cengizali at btinternet.com>; '928 List'
>>> >>>> <928uk at lists.928.org.uk>
>>> >>>> Subject: Re: [928uk] Advice and parts
>>> >>>>
>>> >>>> Cen,
>>> >>>>
>>> >>>> I can't help with much of what you require but I gave up
>>> looking for
>>> >>> decent
>>> >>>> intake tubes and bought a pair of Mercedes Tubes modified to
>>> fit 928's
>>> >>> from
>>> >>>> Roger and 928rus.
>>> >>>>
>>> >>>> The genuine Porsche replacements were about twice the price
>>> in in my
>>> >>> opinion
>>> >>>> inferior in design.
>>> >>>>
>>> >>>> Hope this helps
>>> >>>>
>>> >>>> Regards
>>> >>>>
>>> >>>> Ian
>>> >>>>
>>> >>>> Ian J Marsh
>>> >>>> Regional Organiser
>>> >>>> 07976 242344
>>> >>>> West Country Region
>>> >>>>
>>> >>>>
>>> >>>>
>>> >>>> -----Original Message-----
>>> >>>> From: 928uk<928uk-bounces at lists.928.org.uk> On Behalf Of
>>> Cengiz Ali via
>>> >>>> 928uk
>>> >>>> Sent: Friday, June 7, 2024 4:01 PM
>>> >>>> To: 928 List<928uk at lists.928.org.uk>
>>> >>>> Subject: [928uk] Advice and parts
>>> >>>>
>>> >>>> Hi All,
>>> >>>>
>>> >>>> It was good to see some of you at Simply last weekend.
>>> >>>>
>>> >>>> A few things please:
>>> >>>>
>>> >>>> Does anyone on the list know if the warning triangle
>>> originally came in a
>>> >>>> storage bag (similar to the jack)? If so are they available
>>> or does
>>> >>> anyone
>>> >>>> have one they are willing to sell?
>>> >>>>
>>> >>>> Also, I have an old Porsche tyre inflator, the one that is in
>>> its own
>>> >>> black
>>> >>>> plastic box and runs off the cigarette lighter. It runs but
>>> is pretty
>>> >>> weak
>>> >>>> and not producing enough air to fill a tyre, can these be
>>> repaired?
>>> >>>>
>>> >>>> Also, does anyone have a very good black plastic intake pipe
>>> that runs
>>> >>>> either side of the air box to the front of the car ducts they
>>> want to
>>> >>> sell?
>>> >>>> Many thanks
>>> >>>> Cen
>>> >>>> S2 auto 86.5
>>> >>>>
>>> >>>>
>>> >>>
>>>
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