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Old 05-20-2015, 04:43 PM   #1
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Engine Noise

My new shuttle bus is a 7.3 turbo diesel and obviously I don't expect it to be quiet ride like a Mercedes but it's a lot louder than I thought. What have you guys done to reduce the noise? Hard to even hold a conversation inside the bus
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Old 05-20-2015, 05:29 PM   #2
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I have 2 gallons in my Excursion right now.

Super Tech TC-W3 Outboard 2-Cycle Oil, 1 Gallon - Walmart.com
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Old 05-20-2015, 06:07 PM   #3
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I meant more along the lines of sound deadening material or insulation to reduce noise inside.
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Old 05-20-2015, 07:03 PM   #4
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I looked for any holes in the firewall and plugged them. I also looked for anything that could possibly rattle, scratch, shake etc. under the hood. I eliminated alot of the causes of the noises I had. I also used pieces of leftover generic dynamat on the inside around any tubes etc. that go thru the firewall. Keeping metal from rattling and from transferring the sounds to the inside really helps.
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Old 05-20-2015, 07:19 PM   #5
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you run 2-cycle oil in the fuel? that's new to me but some lube sure might help.
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Old 05-20-2015, 07:53 PM   #6
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I bought a rear engined bus
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Old 05-20-2015, 08:01 PM   #7
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Crazy cal- you are recommending outboard oil to quiet a diesel??? Can you explain that?

Supra- you say it's a shuttle- does it have upolstered or hard seats? Sound will 'reflect' off all the hard surfaces. Curtains, upholstery, and carpet will all help deaden the sound. Fwiw, I wouldn't recommend a permanent carpet because of moisture on a steel floor, but until you convert and add something to your echo chamber, a runner or two might help.
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Old 05-20-2015, 09:05 PM   #8
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I make no recommendations. You must do research.

https://www.google.com/?gws_rd=ssl#q=2+cycle+oil+diesel
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Old 05-20-2015, 10:46 PM   #9
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I was actually suprised how quiet my 7.3 shuttle bus was. I came off 20 years driving a Chevy 350 powered cube van. The engine is only inches away from your foot-theres only so much you can do. I have HD indoor outdoor carpet everywhere-floors ceiling walls. And cushy captians chairs up front. I also installed a front partial carpet (stock replacement-goes to just behind the seats).
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Old 05-20-2015, 11:11 PM   #10
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The oil will quite things down but it is a diesel. There is only so much you can do.
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