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Old 06-01-2017, 09:54 PM   #1
Join Date: Apr 2016
Posts: 108
Quieting the Ford 7.3 Powerstroke

Looking to quiet down the diesel engine on my airporter style shuttle bus a 1999 E450. The two areas esp want to quiet is the engine dog house and the hood. Instead of just recommending dynamat, please indicate what you HAVE DONE AND WHAT YOU USE? If just offering opinion, then indicate that. We all know what products are out there such as dynamat, but am interested about your EXPERIENCE and advice. However glad to have your opinion too, just indicate if you are drawing upon experience or advice? thanks

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Old 06-01-2017, 10:14 PM   #2
Bus Crazy
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Join Date: May 2010
Location: Farmington Hills, Mi (Detroit area)
Posts: 1,966
Year: 2000
Coachwork: Eldorado Aerotech 24'
Chassis: Ford E-450 Cutaway Bus
Engine: 7.3L Powerstroke
Rated Cap: 19
Check the donut seals on your up pipes. They are known to leak both exhaust and noise.

I put two layers of Peel & Seal on the floor around the engine cover and that made a noticeable difference in the racket.

At highway speeds wind is the biggest noise for us.

Liberal use of cloth and carpeting inside the bus will dampen noise.
The Roach Motel
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Old 06-01-2017, 11:04 PM   #3
Join Date: Apr 2016
Posts: 108
That is a great idea, the thing with peel and stick is that some love it and others hate it, but makes me wonder if those that hate it work for companies like Dynamat which lose alot of business to peel and stick. Putting down two layers would be easy and inexpensive. What ever I do, I hope it makes a difference.
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Old 06-02-2017, 01:30 AM   #4
Bus Geek
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Join Date: Feb 2016
Location: Willamina, Oregon
Posts: 6,409
Coachwork: 97 Bluebird TC1000 5.9
Have you used one of the oil treatments? Those can reduce noise and heat a little. Every little bit helps.
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Old 06-02-2017, 05:58 AM   #5
Bus Crazy
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Join Date: Oct 2009
Location: Moodus, Ct.
Posts: 1,062
Year: 1996
Coachwork: Champion
Chassis: Ford e-450
Engine: 7.3 Powerstroke
Rated Cap: 14
I have installed many many sq feet of Dynamat at work. Its good stuff but expensive. Go on Amazon + look up other similar products. We found one that was less than 1/2 the price. (Turns out its made in Russia. )
I'll agree that wind noise is the most noticable going down the road.
Or you can run the engine on WVO-that quiets it a bunch.
Don't make a fuss-just get on the bus!

my bus build
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Old 06-02-2017, 06:13 AM   #6
Bus Nut
Join Date: Jul 2016
Location: Prince George, BC, Canada
Posts: 544
Rockwool is suppose to have a product that is 1.5" thick that might sound proof the firewall. I have used the thicker insulation for sound proofing risers for stage performances. Worked great and was fire proof.

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Old 06-02-2017, 06:18 AM   #7
Bus Geek
Join Date: May 2009
Location: Columbus Ohio
Posts: 16,557
Year: 1991
Coachwork: Carpenter
Chassis: International 3800
Engine: DTA360 / MT643
Rated Cap: 7 Row Handicap
ECCB used hotshot's secret oil treatment on his T-444E (7.3) and says it runs quieter.. im going to add it to mine as well.. (doing it at same time im changing my transmission)
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