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197 Posts
What is it about that Diesel 4BT sound that we like so much? Is it that we know everyone who hears a diesel know that we can beat the snot out of their gasser in a power play?
I diverge.
I know we all like the sound of our 4BT's but what is everyone doing about sound insulation or is it that you just don't care?
I personaly just made an amazing improvement in my cab noise level and I want to share it with everyone here.
I was taking my son out to pick up a new hood for his Honda and I thought I'd ask him, as a passenger, where he thought the engine noise was coming into the cab. My first thought was that he would point to the foot well under him since that was where the 4" exhaust ran only 1/2" away. He leaned over and said it was loudest near my transmission and transfer case shifter boots.
Last night I took off both boots and proceeded to lay down four oval shaped layers of carpet inside each boot. I made sure that the layers were held tight to the metal tunnel opening surface when I was finished.
Today I ran the truck to work and could not believe the sound level difference.
Incidently, one day prior to that I glued down another layer of roofing shingles to the passenger footwell. I have found a very noticeable reduction in noise level. My searches on the TDR site back in 2004 when I started my engine swap indicated that sound is deadened by mass (and I mean something with weight to it). I knew that shingles resembled the material that some of my past cars had under the carpet. The second most important factor in noise reduction is that you give the sound something to extend the time that the sound ricochets between to absorb the energy into. This means alternating layers of dense material with softer layers of something else. If you study some of the more expensive sound deadening product out there you will realize that you can do the same thing with common building materials.
Who needs expensive Dynomat?
I diverge.
I know we all like the sound of our 4BT's but what is everyone doing about sound insulation or is it that you just don't care?
I personaly just made an amazing improvement in my cab noise level and I want to share it with everyone here.
I was taking my son out to pick up a new hood for his Honda and I thought I'd ask him, as a passenger, where he thought the engine noise was coming into the cab. My first thought was that he would point to the foot well under him since that was where the 4" exhaust ran only 1/2" away. He leaned over and said it was loudest near my transmission and transfer case shifter boots.
Last night I took off both boots and proceeded to lay down four oval shaped layers of carpet inside each boot. I made sure that the layers were held tight to the metal tunnel opening surface when I was finished.
Today I ran the truck to work and could not believe the sound level difference.
Incidently, one day prior to that I glued down another layer of roofing shingles to the passenger footwell. I have found a very noticeable reduction in noise level. My searches on the TDR site back in 2004 when I started my engine swap indicated that sound is deadened by mass (and I mean something with weight to it). I knew that shingles resembled the material that some of my past cars had under the carpet. The second most important factor in noise reduction is that you give the sound something to extend the time that the sound ricochets between to absorb the energy into. This means alternating layers of dense material with softer layers of something else. If you study some of the more expensive sound deadening product out there you will realize that you can do the same thing with common building materials.
Who needs expensive Dynomat?