supercharger outlet noise

[Julian Edgar]

Has anyone had any experience in reducing the outlet pulsing noise of a
Roots-type supercharger that's discharging into a pipe (as opposed to a
large volume intake plenum)?

Julian Edgar

[sheik yerbouti]

On Sun, 30 Jan 2005 21:29:59 +1000, "Julian Edgar"
<edgarmednospam@ozemail.com.au> wrote:

>Has anyone had any experience in reducing the outlet pulsing noise of a
>Roots-type supercharger that's discharging into a pipe (as opposed to a
>large volume intake plenum)?
>

what do you mean by outlet pulsing noise?

the noise in the discharge pipe? how did you get your head in there to
hear it?


---
vn commodore transmission swap online manual
http://www.freewebs.com/sheik_yerbouti

[Julian Edgar]

"sheik yerbouti" <delbo21@yahoo.com> wrote in message
news:h8npv09pr7cm38t6241hsn86nhe25i74iq@4ax.com...
> On Sun, 30 Jan 2005 21:29:59 +1000, "Julian Edgar"
> <edgarmednospam@ozemail.com.au> wrote:
>
>>Has anyone had any experience in reducing the outlet pulsing noise of a
>>Roots-type supercharger that's discharging into a pipe (as opposed to a
>>large volume intake plenum)?
>>
>
> what do you mean by outlet pulsing noise?
>
> the noise in the discharge pipe? how did you get your head in there to
> hear it?
>
>
> ---
> vn commodore transmission swap online manual
> http://www.freewebs.com/sheik_yerbouti

You can hear it 10 metres away. Apparently it's also common on positive
displacement industrial air compressors.

Julian Edgar

[Toby Ponsenby]

On Mon, 31 Jan 2005 08:39:42 +1000, Julian Edgar wrote:

> "sheik yerbouti" <delbo21@yahoo.com> wrote in message
> news:h8npv09pr7cm38t6241hsn86nhe25i74iq@4ax.com...
>> On Sun, 30 Jan 2005 21:29:59 +1000, "Julian Edgar"
>> <edgarmednospam@ozemail.com.au> wrote:
>>
>>>Has anyone had any experience in reducing the outlet pulsing noise of a
>>>Roots-type supercharger that's discharging into a pipe (as opposed to a
>>>large volume intake plenum)?
>>>
>>
>> what do you mean by outlet pulsing noise?
>>
>> the noise in the discharge pipe? how did you get your head in there to
>> hear it?
>>
>>
>> ---
>> vn commodore transmission swap online manual
>> http://www.freewebs.com/sheik_yerbouti
>
> You can hear it 10 metres away. Apparently it's also common on positive
> displacement industrial air compressors.
>
> Julian Edgar

Thought about a decoupler?
As seen in marine diesel air intakes.
And Cressidas amongst others.
These are designed for partial pressure, not high pressure, but you
get the idea?

Seem to recall it interrupts the harmonics involved, as well as
working as a surge tank and needs to be a certain size and shape, for
each application.

--
Toby
quidquid latine dictum
sit, altum viditur

[Lord-Data]

Maybe you need a Hi-Clone! :)

"Julian Edgar" <edgarmednospam@ozemail.com.au> wrote in message
news:36569oF4t9q92U1@individual.net...
> "sheik yerbouti" <delbo21@yahoo.com> wrote in message
> news:h8npv09pr7cm38t6241hsn86nhe25i74iq@4ax.com...
>> On Sun, 30 Jan 2005 21:29:59 +1000, "Julian Edgar"
>> <edgarmednospam@ozemail.com.au> wrote:
>>
>>>Has anyone had any experience in reducing the outlet pulsing noise of a
>>>Roots-type supercharger that's discharging into a pipe (as opposed to a
>>>large volume intake plenum)?
>>>
>>
>> what do you mean by outlet pulsing noise?
>>
>> the noise in the discharge pipe? how did you get your head in there to
>> hear it?
>>
>>
>> ---
>> vn commodore transmission swap online manual
>> http://www.freewebs.com/sheik_yerbouti
>
> You can hear it 10 metres away. Apparently it's also common on positive
> displacement industrial air compressors.
>
> Julian Edgar
>

[Julian Edgar]

"Toby Ponsenby" <toby@privacy.net> wrote in message
news:3cc0pobkzblg.srkr88i9xved$.dlg@40tude.net...
> On Mon, 31 Jan 2005 08:39:42 +1000, Julian Edgar wrote:
>
>> "sheik yerbouti" <delbo21@yahoo.com> wrote in message
>> news:h8npv09pr7cm38t6241hsn86nhe25i74iq@4ax.com...
>>> On Sun, 30 Jan 2005 21:29:59 +1000, "Julian Edgar"
>>> <edgarmednospam@ozemail.com.au> wrote:
>>>
>>>>Has anyone had any experience in reducing the outlet pulsing noise of a
>>>>Roots-type supercharger that's discharging into a pipe (as opposed to a
>>>>large volume intake plenum)?
>>>>
>>>
>>> what do you mean by outlet pulsing noise?
>>>
>>> the noise in the discharge pipe? how did you get your head in there to
>>> hear it?
>>>
>>>
>>> ---
>>> vn commodore transmission swap online manual
>>> http://www.freewebs.com/sheik_yerbouti
>>
>> You can hear it 10 metres away. Apparently it's also common on positive
>> displacement industrial air compressors.
>>
>> Julian Edgar
>
> Thought about a decoupler?
> As seen in marine diesel air intakes.
> And Cressidas amongst others.
> These are designed for partial pressure, not high pressure, but you
> get the idea?
>
> Seem to recall it interrupts the harmonics involved, as well as
> working as a surge tank and needs to be a certain size and shape, for
> each application.
>
> --
> Toby
> quidquid latine dictum
> sit, altum viditur

Yes I have looked at this option but space is tight. I was hoping someone
could tell me what they did and how well it fixed it...

Julian Edgar

[D Walford]

Julian Edgar wrote:
>

> Yes I have looked at this option but space is tight. I was hoping someone
> could tell me what they did and how well it fixed it...
>

Give Bob Fisher Automotive a call 0397435041.
He's a well know expert on those things and he is usually quite helpful.



Daryl

[Rainbow Warrior]

"Lord-Data" <data@ihug.com.au> wrote in message
news:41fde8d0$0$356$61c65585@un-2park-reader-02.sydney.pipenetworks.com.au...
> Maybe you need a Hi-Clone! :)

Foam-O-Fill :-)



>
> "Julian Edgar" <edgarmednospam@ozemail.com.au> wrote in message
> news:36569oF4t9q92U1@individual.net...
> > "sheik yerbouti" <delbo21@yahoo.com> wrote in message
> > news:h8npv09pr7cm38t6241hsn86nhe25i74iq@4ax.com...
> >> On Sun, 30 Jan 2005 21:29:59 +1000, "Julian Edgar"
> >> <edgarmednospam@ozemail.com.au> wrote:
> >>
> >>>Has anyone had any experience in reducing the outlet pulsing noise of a
> >>>Roots-type supercharger that's discharging into a pipe (as opposed to a
> >>>large volume intake plenum)?
> >>>
> >>
> >> what do you mean by outlet pulsing noise?
> >>
> >> the noise in the discharge pipe? how did you get your head in there to
> >> hear it?
> >>
> >>
> >> ---
> >> vn commodore transmission swap online manual
> >> http://www.freewebs.com/sheik_yerbouti
> >
> > You can hear it 10 metres away. Apparently it's also common on positive
> > displacement industrial air compressors.
> >
> > Julian Edgar
> >
>
>

[Julian Edgar]

"D Walford" <walford@iprimus.com.au> wrote in message
news:41FDFE43.26946EC@iprimus.com.au...
> Julian Edgar wrote:
>>
>
>> Yes I have looked at this option but space is tight. I was hoping someone
>> could tell me what they did and how well it fixed it...
>>
>
> Give Bob Fisher Automotive a call 0397435041.
> He's a well know expert on those things and he is usually quite helpful.
>
>
>
> Daryl

Thanks for that - a nice guy and very helpful on the phone to me.

Julian Edgar

[OzOne]

On Sun, 30 Jan 2005 21:29:59 +1000, "Julian Edgar"
<edgarmednospam@ozemail.com.au> scribbled thusly:

>Has anyone had any experience in reducing the outlet pulsing noise of a
>Roots-type supercharger that's discharging into a pipe (as opposed to a
>large volume intake plenum)?
>
>Julian Edgar

Lancia didn't have a big plenum, the puffer was mounted direct into
the inlet manifold,


Oz1...of the 3 twins.

I welcome you to crackerbox palace,We've been expecting you.

[Julian Edgar]

<OzOne> wrote in message news:rbt001h3ea83cop902indttub9lv6vfafg@4ax.com...
> On Sun, 30 Jan 2005 21:29:59 +1000, "Julian Edgar"
> <edgarmednospam@ozemail.com.au> scribbled thusly:
>
>>Has anyone had any experience in reducing the outlet pulsing noise of a
>>Roots-type supercharger that's discharging into a pipe (as opposed to a
>>large volume intake plenum)?
>>
>>Julian Edgar
>
> Lancia didn't have a big plenum, the puffer was mounted direct into
> the inlet manifold,
>
>
> Oz1...of the 3 twins.
>

....which acts as a good damper of sound waves...

Julian Edgar