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. |
Superhawk996 |
Nov 14 2019, 01:55 PM
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#2
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914 Guru Group: Members Posts: 5,876 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
On a more serious note if you want sound attenuation here is what can be done:
Switch from Leather / Vinyl seats to cloth. You want the accoustic absorption of the cloth. Switch to thicker carpet pile. Put shoddy under your floor carpets if you don't want thicker pile. Put foam or shoddy on ther underside of the dash (on the bare sheetmetal) Air leakage = sound leakage Seal any stray holes in the dash and/or rear bulkhead Make sure your window seals and Targa seals are in good shape and sealing Put shoddy behind the rear back pad & make sure you have the engine side sound deadner in place too. Put some sort of headliner (soft, fuzzy, acoustic material) on the underside of the targa. You could also inset the door panels with cloth / Alcantera materials. Question is - how much are you willing to do? Even if you did all the suggestions above, it still will never be as quiet as a Lexus for a multitude of reasons. |
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