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> My 914 is not OSHA compliant, Interior engine noise
Coondog
post Nov 12 2019, 10:24 PM
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OSHA says that noise over 85 dba requires a written hearing protection program.
Well I measured the sound level at 3000 RPM and I was at 87 dba.
Running a 3.2 with Bens headers.

Lots of free dba apps out there at no cost. Usually about +/- 1-2 error rate.
OSHAs hearing protection rules say anything over 90 dba 8 hour TWA requires hearing protection.

Of course these rules don’t apply to us but check out your sound measurements next time you take a drive........ (IMG:style_emoticons/default/driving.gif)

Also know that 90 dba is twice as loud as 85dba.
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mepstein
post Nov 12 2019, 10:26 PM
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What do you have on your firewall and is that with the top off or the windows and top up?
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Coondog
post Nov 12 2019, 10:32 PM
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QUOTE(mepstein @ Nov 12 2019, 08:26 PM) *

What do you have on your firewall and is that with the top off or the windows and top up?



RR interior firewall pad with 911 carpet. Engine side pad removed, windows up and top on.
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sixnotfour
post Nov 13 2019, 01:50 AM
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#TEAMBOSE
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Tdskip
post Nov 13 2019, 07:27 AM
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Is your 3.2L running a factory FI?
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mepstein
post Nov 13 2019, 07:44 AM
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What exhaust are you running?
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DRPHIL914
post Nov 13 2019, 08:11 AM
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QUOTE(Coondog @ Nov 12 2019, 11:32 PM) *

QUOTE(mepstein @ Nov 12 2019, 08:26 PM) *

What do you have on your firewall and is that with the top off or the windows and top up?



RR interior firewall pad with 911 carpet. Engine side pad removed, windows up and top on.
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sorry I have to ask, who did the stitching on your seat inserts/ cushions and headrest pieces? looks awesome!( and center pieces)

- i'd say if the top is on and windows are up , if you have a sound pad in engine compartment, that's all you can do sort of putting additional padding behind carpet.

-that and your exhaust. is it carbs or injection? I know the muffler/header set up is going to make the biggest difference probably
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Coondog
post Nov 13 2019, 09:00 AM
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Interior done by Patrick Motorsports, FI and Bens Headers.
Download a dba app. I think you will find that most of you will have readings in the mid 80s.

Only the wife complains about the noise so who cares....... (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif)
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poorsche914
post Nov 13 2019, 10:40 AM
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I downloaded an app... peaked at 100db at full accelleration (IMG:style_emoticons/default/blink.gif)
Cruising was mid 80s
Windows up and top on (it's 20*F here!)

No rear pad on interior or engine bay.
2056 with dual Webers
No radio (IMG:style_emoticons/default/happy11.gif)

(IMG:style_emoticons/default/driving.gif)
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Mark Henry
post Nov 13 2019, 10:57 AM
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The factory engine bay sound deadening pad is heavy and can promote rust if the car is left to the elements, but it reduces noise big time. My 914/6 conversion I added a big firewall hatch and I cut and modified the OE pads in and out to fit tighter to the firewall.
I have webers, headers and a used old banana, but at cruise speeds you can carry on a normal conversation with a passenger.

I know many say leave the pad out because it can rust behind the pad, honestly my 914 is never left outside and is only driven on nice days, so that makes the rust argument moot.

(IMG:http://www.914world.com/bbs2/uploads/post-26-1497236248.jpg)
(IMG:http://www.914world.com/bbs2/uploads/post-26-1497236287.jpg)

My bug has a T4 914 based big bore with loud exhaust and nothing on the firewall just dynamat on the interior. It's so freaking loud in the car you have to shout at the passenger. Long trips I have to wear earplugs. The next time the engine comes out I'm going to add a firewall noise pad.
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Tdskip
post Nov 13 2019, 03:13 PM
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QUOTE(Coondog @ Nov 13 2019, 10:00 AM) *

Interior done by Patrick Motorsports, FI and Bens Headers.
Download a dba app. I think you will find that most of you will have readings in the mid 80s.

Only the wife complains about the noise so who cares....... (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif)


To confirm - no engine bay pad like Mark showed, correct?
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Coondog
post Nov 13 2019, 04:02 PM
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QUOTE(Tdskip @ Nov 13 2019, 01:13 PM) *

QUOTE(Coondog @ Nov 13 2019, 10:00 AM) *

Interior done by Patrick Motorsports, FI and Bens Headers.
Download a dba app. I think you will find that most of you will have readings in the mid 80s.

Only the wife complains about the noise so who cares....... (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif) (IMG:style_emoticons/default/lol-2.gif)


To confirm - no engine bay pad like Mark showed, correct?



Sorry for the confusion. Yes engine bay pad on interior only.
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Steve
post Nov 13 2019, 04:20 PM
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Is it engine noise or muffler or both? What muffler do you have? I installed bens quiet muffler and it made a big diference. No drone, I can here the stereo now and talk to a passenger. However I noticed the 3.2 with injection is louder than my 2.7 was with webers.
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PCH
post Nov 13 2019, 04:23 PM
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No engine pad here on my 1971 with stock D-Jet.

My biggest noise problem is the passenger screaming: " slow down in the corners!".
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brcacti
post Nov 13 2019, 04:35 PM
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The engine firewall pad is a MUST, I just recently fixed mine as it was starting to fall in some places.
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Coondog
post Nov 13 2019, 06:41 PM
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Engine noise and it sure sounds awesome. (IMG:style_emoticons/default/driving.gif)
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RickS
post Nov 13 2019, 10:38 PM
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After having my ears ring after some long drives, I resorted to ear plugs. No more ring and feel a bit less tired on long drives.
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PanelBilly
post Nov 13 2019, 10:59 PM
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I put insulation on the solid part of the engine cover too.
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sixnotfour
post Nov 14 2019, 04:53 AM
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QUOTE
After having my ears ring after some long drives, I resorted to ear plugs. No more ring and feel a bit less tired on long drives.

PPE is the only solution

Bose
https://www.amazon.com/Mpow-Active-Noise-Ca...=dp_ob_title_ce


Domio Noise Cancelling Earplugs
https://domiosports.com/products/earplugs?v...BCABEgKNTvD_BwE


Howard Leight by Honeywell Impact Sport Sound Amplification Electronic Shooting Earmuff,
https://www.amazon.com/Howard-Leight-Honeyw...HHNH2334FEDMC7A
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campbellcj
post Nov 14 2019, 08:14 AM
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I know from experience that the type of air filter/cleaner setup impacts the interior sound a ton, particularly on a -6. On the extreme side there's the foam type filters like ITG, stock airbox and paper filter on the quieter side. Currently I've got Webers with flat-top K&Ns and zero sound insulation. My car is so loud even with the Dansk 1-out street muffler that I typically wear my custom earplugs when not in my helmet which has ear protection built-in.
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