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Old 06-13-2024, 08:59 AM   #1
Bus Nut
Join Date: Aug 2020
Location: Alabama
Posts: 336
Year: 1996
Coachwork: BlueBird
Chassis: International 3800
Engine: DT 466 Mech. Spicer 5 speed
Rated Cap: 34
Spray foam for noise reduction

I have a 7 window front engine short bus with the all the seats removed and the floor covering removed down to metal. I have covered the dog house with KilMat.

I realize that a front engine bus is noisier. It has a DT 466 and the engine RPM at cruise will be about 2000 to 2100 RPM.

My question is-- for folks who have used spray foam in the walls and ceiling and finished the bus out-- is it significantly quieter after the conversion?

At the current level of noise--with the interior removed-- I have to question whether I would be happy driving it on long trips.

I have also considered noise cancelling headphones....

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Old 06-13-2024, 02:23 PM   #2
Bus Crazy
nikitis's Avatar
Join Date: Jun 2023
Location: South Carolina
Posts: 1,119
Year: 1995
Coachwork: Thomas
Chassis: International 3800
Engine: T444E
Rated Cap: 29
The passengers would love it more. And notice a difference, you won't as much.

A product I'm going to use for my undercoating of my bus is 3M Rubber Undercoating which acts as a rust prevention, but because it's rubber also absorbs a lot of the vibration to make it quieter.

But beyond that and kilmat I don't think there is much else you're gonna be able to do.
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Old 06-13-2024, 06:13 PM   #3
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Join Date: Feb 2021
Posts: 5
It helps a LOT with the sound!
Adding furniture and things has dampened the sound a lot more, though. There's a lot less noise from the road when there are cabinets covering so much of the floor, a runner rug through the middle, etc. The weight also made the ride a lot smoother and less bouncy.

The stairs are a huge cause of road noise, so making sure all the gaps in the front door are sealed and adding flooring (ideally with rugs/doormats) helps a lot.

Other considerations are tires (my all-terrains are way louder than the highway tires it came with)... and your body mounts/bushings. New polyurethane mounts to replace the torn and cracked ones will make your ride a lot smoooother and a lot quieter (both from road noise and the jostling and shifting and shaking around inside). I don't have specific recommendations but they don't need to be the crazy expensive ones, just try RockAuto first.
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