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LancePearson · 02-25-2013

Robert, I agree in general. When I have opened the tunnel to deal with the radio there is some 1/2" or 3/8" thick stuff in there that is dry and not rotted and the car's interior noise level and heat level is fine especially when compared to my 76 where I ripped it all out and did what you did. However, on the highway just forward of the tunnel when I drove the car home from my Atlanta purchase in December all 515 miles I kept hearing this sort of whooshing sound almost behind the radio. I did not know what it was but since have learned the ZF is a noisy tranny and that simply folding a microfiber towel and placing it on the ashtray access door and forward and up 4" across the front of the bottom of the center trim piece over the radio/hvac/dic stack stops the noise entirely. When I opened it up for the radio, sure enough it's all thin plastic and below the radio there is a sort of 1.5" or so by the radio head deep cave there which I believe can act a bit like a resonance chamber...the tube on a pipe organ so to speak under the right circumstances. All I did was use the .080 urethane foam adhesive with foil face to coat most of those plastic surfaces and the inside of the trim to try and stop what I think is inherent, resonance in the plastic surfaces which aren't thick enough to stop it. I'll probably put some on the bottom of the radio to absorb sound a bit more as well when I do the final stick it back in. I did not close any openings so air can flow if it is a design feature which I doubt but just in case....We'll see when I get the radio all the way done. Just waiting for something to arrive now and then I'll button it up and try it. I sure agree it's not worth redoing the cockpit. The cockpit so far is much cooler than the 76 was before I did this with thicker urethane on the cage floor and tunnel the way it is already so I'm not worried about that either. We'll see in a little while. I'm probably being obsessive about the noise.

In the 76 I also switched the two seats when I had them out to redo the floor and carpets. I'll probably switch the two seats next winter on the 91 as well though I may recover the driver's side with new leather. next year's project. In a month or so it's time to start using it, time to resume serious kayaking and time to start thinking about my Flying scot sailboat too!

Thanks for the information...it confirms what I'd thought about the cockpit.

02-25-2013	#31
LancePearson Join Date: Dec 2012 Location: Chester, Virginia Posts: 457	Re: Bose Speaker Amps/radio face Robert, I agree in general. When I have opened the tunnel to deal with the radio there is some 1/2" or 3/8" thick stuff in there that is dry and not rotted and the car's interior noise level and heat level is fine especially when compared to my 76 where I ripped it all out and did what you did. However, on the highway just forward of the tunnel when I drove the car home from my Atlanta purchase in December all 515 miles I kept hearing this sort of whooshing sound almost behind the radio. I did not know what it was but since have learned the ZF is a noisy tranny and that simply folding a microfiber towel and placing it on the ashtray access door and forward and up 4" across the front of the bottom of the center trim piece over the radio/hvac/dic stack stops the noise entirely. When I opened it up for the radio, sure enough it's all thin plastic and below the radio there is a sort of 1.5" or so by the radio head deep cave there which I believe can act a bit like a resonance chamber...the tube on a pipe organ so to speak under the right circumstances. All I did was use the .080 urethane foam adhesive with foil face to coat most of those plastic surfaces and the inside of the trim to try and stop what I think is inherent, resonance in the plastic surfaces which aren't thick enough to stop it. I'll probably put some on the bottom of the radio to absorb sound a bit more as well when I do the final stick it back in. I did not close any openings so air can flow if it is a design feature which I doubt but just in case....We'll see when I get the radio all the way done. Just waiting for something to arrive now and then I'll button it up and try it. I sure agree it's not worth redoing the cockpit. The cockpit so far is much cooler than the 76 was before I did this with thicker urethane on the cage floor and tunnel the way it is already so I'm not worried about that either. We'll see in a little while. I'm probably being obsessive about the noise. In the 76 I also switched the two seats when I had them out to redo the floor and carpets. I'll probably switch the two seats next winter on the 91 as well though I may recover the driver's side with new leather. next year's project. In a month or so it's time to start using it, time to resume serious kayaking and time to start thinking about my Flying scot sailboat too! Thanks for the information...it confirms what I'd thought about the cockpit. Last edited by LancePearson; 02-25-2013 at 02:24 PM.