« on: Today at 05:09:37 am »
Speaking of fiberglass insulation in the transitions and the cap...
Was thinking about requesting that PC put some dynamat in those areas before the insulation goes in thinking those areas might add to noise in the cab.
I asked Barry about this and he kind of dismissed the idea as unnecessary and said the fiberglass did a good job on noise.
Would you guys agree?
I also asked about adding dynamat to the inside of the door skins and got the same answer. I have gotten excellent results using dynamat in passenger cars for sound deadening.
Made my Camry ride like an Avalon! Have a feeling if they won't do the doors at the factory that I will be doing it myself.
Might be worth considering while your transitions are open.
I agree that dynamat is not a necessary item to dampen fiberglass. it has no 'resonance' to dampen.
Quick test to see if noise dampening material will help - pound on it with a closed fist. Slap it quicker and lighter also, you are trying to emulate road vibrations. Does it have a dull thud? No dampening needed. Does it 'ring' or 'gong' at all? Or do the vibrations make something else 'buzz'? Dampen it.
Restoring my 2350, I found the noise(s) in the cab were all ceiling and top cabinet related. Only ONE of 8 screws were seated correctly attaching the cutaway roof to the cabinets - had a horrible noise sometimes right above the passenger head. I upgraded the screws with carriage bolts... After firmly re-attaching the cabinets to the original roof, I am VERY pleased with the lack of noise on the highway. The 'creak-creak' it used to have going over rough terrain slowly is gone also.
Doing the cockpit floor with dampening material made a big difference also. My coach is 'airplane' quiet on the road now.