Originally Posted by CAELESTIS
You may also look at Soundown of Ft Lauderdale.
During my re-power, I lined the complete engine compartment with Fat-Mat prior to the sound insulation. Fat Mat or Dynomat severely reduce resonance, and is used by many stereo freaks. For further sound reduction, use a gas/water separation muffler
(drops another 20db) from Soundown.
Thanks for the ideas.
What 's coming out of the box is 10 year old 1.25" EAR foam/vinyl/foam/mylar soundabsorbing barrier.
I'm familiar with Soundown's acoustic insulation, Glacier's Ultra-DB 1.5" material is half the weight of Soundown's 2" two pound/square foot material and achieves slightly better sound reduction. I prefer to minimize weight where possible, and Glacier's material should do that. The Fatmat is an idea, but I do not wish to add more weight.
Unfortunately I do not have room to install an air/water separater on the exhaust
side; I do have two smaller water lift
mufflers located within the engine box volume, and they will have to do for quieting noise
in the exhaust
Somehow putting a 50hp tractor motor
in a plywood
box inside the cabin
, and then standing next to it to wonder why it's noisy - seems like a lesson in futility!
I do expect that replacing the 1.25" x 1lb/sq ft sound insulation with the 1.5" Ultra-db will be a nice improvement.