My 914 is not OSHA compliant, Interior engine noise |
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My 914 is not OSHA compliant, Interior engine noise |
Coondog |
Nov 12 2019, 10:24 PM
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#1
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Advanced Member Group: Members Posts: 2,089 Joined: 24-September 15 From: Apple Valley Calif Member No.: 19,195 Region Association: Southern California |
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. |
Mark Henry |
Nov 13 2019, 10:57 AM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
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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