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pierrebear
Spa-Francorchamps


Joined: 27 Sep 2017
Posts: 335
Location: Jersey


PostPosted: Wed Feb 12, 2020 1:04 pm    Post subject: Annoying buzz under load Reply with quote

Hi all,

This is a bit of a long shot but...I recently had a valet which included a steam clean of the engine bay (now looks lovely and shiny). Ever since though I've noticed that at around 2.5k or 3k revs there is an annoying buzzing sort of noise - the sound deadening is (to quote Zingers) saggier than an octogenarian's whatsits but...does anyone have any clues as to where I might start trying to resolve this?

Thanks in advance.

Pierre

P.S. Moral of the story is that I should just drive it and keep it dirty!
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1995 Carrera 2 coupe manual, midnight blue
EX 997.1 Carrera 4S coupe manual, basalt black
EX 2003 Mercedes SL500, green black (dark blue!)
 
  
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Tobesetc
Albert Park


Joined: 02 Jun 2014
Posts: 1606
Location: West London, UK


PostPosted: Wed Feb 12, 2020 2:48 pm    Post subject: Reply with quote

The sag is easily sorted with a engine tidy strip thingumymajig!

I had hated the drone from the rear bulkhead at motorway cruising speed, so fitted new interior sound deadening, but your description is something different, I'd think.
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decgraham
Barcelona


Joined: 17 Sep 2008
Posts: 1377
Location: Spain


PostPosted: Wed Feb 12, 2020 5:07 pm    Post subject: Reply with quote

Hi Pierrebear,

Can't help with the buzz but have attached pics of before and after with the tidy strip. Thumb

ATB Smile
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1995 993 C2 Cab TipS in Guards Red
 



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pierrebear
Spa-Francorchamps


Joined: 27 Sep 2017
Posts: 335
Location: Jersey


PostPosted: Wed Feb 12, 2020 5:46 pm    Post subject: Reply with quote

You lot are a terrible influence...anyone got a linky to where I might buy? Is it a DIY job to install?
_________________
1995 Carrera 2 coupe manual, midnight blue
EX 997.1 Carrera 4S coupe manual, basalt black
EX 2003 Mercedes SL500, green black (dark blue!)
 
  
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hopeydaze
Monza


Joined: 06 Jan 2012
Posts: 188
Location: Wargrave, Berkshire, UK


PostPosted: Wed Feb 12, 2020 8:05 pm    Post subject: Reply with quote

pierrebear wrote:
You lot are a terrible influence...anyone got a linky to where I might buy? Is it a DIY job to install?


Tore/Bergville sell the tidy strip. I believe they are made in the US and Tore distributes the product.
 
  
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berni29
Indianapolis


Joined: 24 Oct 2009
Posts: 2285
Location: Kent


PostPosted: Wed Feb 12, 2020 8:16 pm    Post subject: Reply with quote

Hi

Buzzes from the rear could be heatshield related. Perhaps get someone to rev your car while you listen around.

Is the car manual? if so you could depress the clutch and let the engine revs fall back and see if the noise remains.

Best of luck!

Berni
_________________
993 C2 Tip 1994 187k miles. Black and Grey. M029 & Bilstein HD's, Elephant Racing RS bushes F&R, RS mounts, strengthened engine carrier, 100 cell cat inserts, HID's. Solid steering arms mod, top of the engine rebuilt, mapped by Wayne, suspension set up by Chris.
 
  
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pierrebear
Spa-Francorchamps


Joined: 27 Sep 2017
Posts: 335
Location: Jersey


PostPosted: Wed Feb 12, 2020 8:47 pm    Post subject: Reply with quote

I think you might be on to something with the heatshields Bernie. It is only in a specific part of the rev range but seems to be quite a fixture. Think I might take it into a friendly garage and take a look at the state of the heat shields. Was a verdict ever reached on whether they are even necessary?! (runs away from the Illuminati's screams)
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1995 Carrera 2 coupe manual, midnight blue
EX 997.1 Carrera 4S coupe manual, basalt black
EX 2003 Mercedes SL500, green black (dark blue!)
 
  
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berni29
Indianapolis


Joined: 24 Oct 2009
Posts: 2285
Location: Kent


PostPosted: Wed Feb 12, 2020 10:12 pm    Post subject: Reply with quote

Hello again

If it is the heat shields and they are loose then it will likely be audible in a specific rev range due to resonance.

I can tell you that the shields really are necessary in my opinion. The heat build up under and around the engine is just incredible.

All the best

Berni
_________________
993 C2 Tip 1994 187k miles. Black and Grey. M029 & Bilstein HD's, Elephant Racing RS bushes F&R, RS mounts, strengthened engine carrier, 100 cell cat inserts, HID's. Solid steering arms mod, top of the engine rebuilt, mapped by Wayne, suspension set up by Chris.
 
  
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decgraham
Barcelona


Joined: 17 Sep 2008
Posts: 1377
Location: Spain


PostPosted: Thu Feb 13, 2020 7:41 am    Post subject: Reply with quote

pierrebear wrote:
You lot are a terrible influence...anyone got a linky to where I might buy? Is it a DIY job to install?


Hi pierrebear, I got mine back in August 2016 from Germany for €82.00 which included the strip the plastic nuts and DHL to Spain. It was a 10 minute fix.

This is the email address of the supplier: elvira.nehring@web.de

Good communication and I paid with PayPal so secure.

ATB Smile
_________________
1995 993 C2 Cab TipS in Guards Red
 



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jonttt
Long Beach


Joined: 20 Aug 2012
Posts: 6653
Location: Liverpool


PostPosted: Thu Feb 13, 2020 8:10 am    Post subject: Reply with quote

Ah the old Motorraumdämmmattenleiste ......

Also available in carbon Smile
_________________
1997 Porsche 911 993 C4S My Journal
2011 Porsche 987.2 Boxster Black Edition My Journal
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2017 BMW 740 Msport
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Counter Of Beans
Nürburgring


Joined: 10 May 2018
Posts: 449
Location: Hampshire


PostPosted: Thu Feb 13, 2020 9:28 am    Post subject: Reply with quote

At the risk of going off topic, how easy is it to remove the sound damping material from the top of the engine bay? Is it an engine drop job?
And can you just rip it out and not replace? It looks manky, and I can't imagine it does very much. Has anyone removed theirs?
_________________
1995 993 C2 manual coupe. Midnight Blue / Marble Grey, RSR's, FD Motorsports SSK + G/R, HID's, 996 steering wheel, now with working aircon!
 
  
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cableguy
Watkins Glen


Joined: 10 Sep 2007
Posts: 2105
Location: North Yorkshire


PostPosted: Thu Feb 13, 2020 9:32 am    Post subject: Reply with quote

jonttt wrote:
Ah the old Motorraumdämmmattenleiste ......

Also available in carbon Smile


Carbon on a 20+ year old 911... No thanks! Surprised

C.
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Gwsinc
Newbie


Joined: 04 Sep 2019
Posts: 22
Location: Hants


PostPosted: Thu Feb 13, 2020 3:34 pm    Post subject: Reply with quote

I got a pad tidy for less than half of the above price from a fellow 993er who’s active on these forums. Check out @993.pad.tidy on Instagram.

As for the buzz, it sounds like it’ll be a case of getting your hands in there and gently wiggling things to see if they’re the source, quite possibly something was removed and not re-seated properly. Exhaust heat shields also a likely cause.

To remove the engine pad you have to take the engine out. So the pad tidy is definitely the simplest way to go!
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ch3tman
Imola


Joined: 08 Dec 2012
Posts: 793
Location: South Bucks

1995 Porsche 911

PostPosted: Thu Feb 13, 2020 7:26 pm    Post subject: Reply with quote

Counter Of Beans wrote:
At the risk of going off topic, how easy is it to remove the sound damping material from the top of the engine bay? Is it an engine drop job?
And can you just rip it out and not replace? It looks manky, and I can't imagine it does very much. Has anyone removed theirs?

I had mine completed removed and replaced. Yes - it's an engine out job. A new sound pad is not expensive at all but of course if you're dropping the engine the final bill probably will be.

I did contemplate removing it but am sure I read, either here or on Rennlist, it's quite effective at protecting the cabin from resonance so I had a new one put in, as the car is used for all purposes. For a track car, maybe it's better out.

At ~23 years old it was quite dry/crusty/falling apart (most of it you cannot see) so not sure how effective the Motorraumdämmmattenleiste strip thingy is, apart from tidying up the small portion you can see...
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berni29
Indianapolis


Joined: 24 Oct 2009
Posts: 2285
Location: Kent


PostPosted: Thu Feb 13, 2020 7:39 pm    Post subject: Reply with quote

Hi

Its been a while but I am pretty sure I removed mine with the engine in situ. It may have come out in chunks though. I prefer it not to be there. I like to hear the engine. I do not think it makes much of a difference when it comes to exhaust boom or resonance.

Berni
_________________
993 C2 Tip 1994 187k miles. Black and Grey. M029 & Bilstein HD's, Elephant Racing RS bushes F&R, RS mounts, strengthened engine carrier, 100 cell cat inserts, HID's. Solid steering arms mod, top of the engine rebuilt, mapped by Wayne, suspension set up by Chris.
 
  
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pierrebear
Spa-Francorchamps


Joined: 27 Sep 2017
Posts: 335
Location: Jersey


PostPosted: Thu Feb 13, 2020 7:52 pm    Post subject: Reply with quote

that’s interesting Bernie. Are your heat shields stock though?
_________________
1995 Carrera 2 coupe manual, midnight blue
EX 997.1 Carrera 4S coupe manual, basalt black
EX 2003 Mercedes SL500, green black (dark blue!)
 
  
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berni29
Indianapolis


Joined: 24 Oct 2009
Posts: 2285
Location: Kent


PostPosted: Sat Feb 15, 2020 7:26 pm    Post subject: Reply with quote

Hi

When I bought my car back in 2008 I had owned it for 30 minutes when someone drove into the back and cracked the bumper. All the heat shields except the two small ones that attach to the exhaust were replaced with new original Porsche ones. The old ones were pretty rusted. Esp the Cat one.

For the two small exhaust ones I used an aftermarket heat shielding material. made of a waffle like material.

Berni
_________________
993 C2 Tip 1994 187k miles. Black and Grey. M029 & Bilstein HD's, Elephant Racing RS bushes F&R, RS mounts, strengthened engine carrier, 100 cell cat inserts, HID's. Solid steering arms mod, top of the engine rebuilt, mapped by Wayne, suspension set up by Chris.
 
  
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