My 914 is not OSHA compliant, Interior engine noise Options

[Coondog]

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.

[Rikyrat]

Thought I would ring in on this. I am in the midst of cleaning the engine bay, have sandblasted and repainted.

I installed FatMat brand sound insulation, on the firewall, pretty simple.

Then I covered the engine side of the sound mat, with another layer of it. As an aside, when I scrubbed the sound mat, I was surprised to find that it was green, every 914 I have had, this is my third, the mat appeared to be black, probably do to it being filthy.

When I went to put the insulation on the sound mat, I could not get it to adhere, so I used contact cement on it.

Then screwed the mat to the firewall, which I was hesitant to do, but the original pins did not want to hold it in place.

Hopefully this will tone down some of the engine noise, but who cares, if you really don't want to hear it or want to listen to music, wear ear buds.

Also, when I get around to doing the interior, this summer, I am going to do the same thing to the cabin side of the firewall, in addition to doing the floor, before installing new carpet.

Have a nice day