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05-20-2015, 03:43 PM
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#1
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New Member
Join Date: Mar 2015
Posts: 5
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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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05-20-2015, 04:29 PM
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#2
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Moderator
Join Date: Feb 2007
Location: NUNYA
Posts: 4,236
Year: 1995
Coachwork: Thomas
Chassis: 3800
Engine: DT408, AT545
Rated Cap: 23 500 gvw
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05-20-2015, 05:07 PM
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#3
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New Member
Join Date: Mar 2015
Posts: 5
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I meant more along the lines of sound deadening material or insulation to reduce noise inside.
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05-20-2015, 06:03 PM
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#4
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Bus Nut
Join Date: Dec 2014
Location: Florida
Posts: 584
Year: 1988
Coachwork: Blue Bird
Chassis: I.H.
Engine: DT360
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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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05-20-2015, 06:19 PM
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#5
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Bus Crazy
Join Date: Apr 2013
Location: Colorado
Posts: 2,356
Year: 1993
Coachwork: bluebird
Engine: 5.9 Cummins, Allison AT1545
Rated Cap: 2
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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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05-20-2015, 06:53 PM
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#6
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Bus Crazy
Join Date: Apr 2014
Location: EHT New Jersey
Posts: 1,134
Year: 2003
Coachwork: AmTran
Chassis: International 3000RE
Engine: T444E/AT545
Rated Cap: 75
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I bought a rear engined bus
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05-20-2015, 07:01 PM
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#7
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Skoolie
Join Date: Mar 2015
Location: Currently in Appalachia.
Posts: 148
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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.
__________________
~Pamela
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05-20-2015, 08:05 PM
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#8
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Moderator
Join Date: Feb 2007
Location: NUNYA
Posts: 4,236
Year: 1995
Coachwork: Thomas
Chassis: 3800
Engine: DT408, AT545
Rated Cap: 23 500 gvw
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05-20-2015, 09:46 PM
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#9
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Bus Crazy
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
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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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05-20-2015, 10:11 PM
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#10
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Moderator
Join Date: Feb 2007
Location: NUNYA
Posts: 4,236
Year: 1995
Coachwork: Thomas
Chassis: 3800
Engine: DT408, AT545
Rated Cap: 23 500 gvw
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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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05-20-2015, 11:12 PM
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#11
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Bus Crazy
Join Date: May 2010
Location: Farmington Hills, Mi (Detroit area)
Posts: 1,968
Year: 2000
Coachwork: Eldorado Aerotech 24'
Chassis: Ford E-450 Cutaway Bus
Engine: 7.3L Powerstroke
Rated Cap: 19
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I've also been adding outboard oil to the fuel tank. It seems to make the engine less "rattley" and adds some lubrication back to the low sulfur diesel fuel. I got a small bump in fuel mileage to boot.
Carpet on floor and walls does help quite a bit but I agree there's only so much you can do to quiet the noisy engine.
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05-21-2015, 12:05 AM
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#12
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Moderator
Join Date: Feb 2007
Location: NUNYA
Posts: 4,236
Year: 1995
Coachwork: Thomas
Chassis: 3800
Engine: DT408, AT545
Rated Cap: 23 500 gvw
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Quote:
Originally Posted by SassyLass
Crazy cal- you are recommending outboard oil to quiet a diesel??? Can you explain that?
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I don't want my answer to sound short. I'm not going to tell you to put something in your engine that's not a normal additive for a diesel engine. I use it and have for a long time. Most diesel engines on this site were built before sulfur was removed from diesel. It was used as a lubricant.
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05-21-2015, 04:54 AM
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#13
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Bus Crazy
Join Date: Apr 2014
Location: EHT New Jersey
Posts: 1,134
Year: 2003
Coachwork: AmTran
Chassis: International 3000RE
Engine: T444E/AT545
Rated Cap: 75
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There's some interesting info here on 2 cycle oil in a diesel. Particularly extreme cold starts ( <-30 F) with just a 128:1 ratio
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05-21-2015, 08:41 AM
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#14
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Moderator
Join Date: Feb 2007
Location: NUNYA
Posts: 4,236
Year: 1995
Coachwork: Thomas
Chassis: 3800
Engine: DT408, AT545
Rated Cap: 23 500 gvw
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Good writeup.
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05-21-2015, 09:35 AM
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#15
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Bus Crazy
Join Date: Sep 2013
Location: Vacaville, Ca
Posts: 1,634
Year: 1988
Coachwork: Crown / Pusher
Engine: 8.3 Cummins
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Quote:
Originally Posted by crazycal
Good writeup.
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LOL, I just watched your youtube link.
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05-21-2015, 10:26 AM
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#16
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Skoolie
Join Date: Mar 2015
Location: Currently in Appalachia.
Posts: 148
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Crazycal- i understand not recommending anything here. Sulphur, high temp lubricant, old buses... gotcha!
I agree with you crazycal re scooternj's link - excellent write-up x2
Thanks all for the links!
For anyone that assumes 2 stroke oil is useful for all diesel engines and injection pumps, scooternj's link list a few that you should NEVER consider doing this with and why.
__________________
~Pamela
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05-21-2015, 11:03 AM
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#17
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Bus Crazy
Join Date: Nov 2011
Location: Sault Ste. Marie, Ontario
Posts: 1,791
Year: 1997
Coachwork: Thomas
Chassis: B3800 Short bus
Engine: T444E
Rated Cap: 36
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Exhaust leaks will add to the engine noise as well. With the 7.3l (assuming it's a powerstroke with a turbo) check around the up-pipes and turbo for black soot. Soot means there's a leak. Leaks mean noise.
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05-21-2015, 12:34 PM
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#18
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Bus Crazy
Join Date: Apr 2010
Posts: 1,208
Year: 1999
Coachwork: Bluebird
Chassis: 3800 International
Engine: T444E
Rated Cap: 72
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I just replace all 8 of my fuel injectors and it made a noticeable difference in lowering the noise, also I sprayed rocker guard on the inside of the fire wall, and put carpet on it, also covering the stair case well cuts down big time on road noise.
Wife and I can hold a conversation with a normal voice (pros and cons to that), my brother inlaw is a trucker and the insulate the inside of the hoods, but i think that would create a over heat problem with the 7.3s
gbstewart
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05-21-2015, 12:53 PM
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#19
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Moderator
Join Date: Feb 2007
Location: NUNYA
Posts: 4,236
Year: 1995
Coachwork: Thomas
Chassis: 3800
Engine: DT408, AT545
Rated Cap: 23 500 gvw
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Quote:
Originally Posted by jazty
Exhaust leaks will add to the engine noise as well. With the 7.3l (assuming it's a powerstroke with a turbo) check around the up-pipes and turbo for black soot. Soot means there's a leak. Leaks mean noise.
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On the list for the Excursion.
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05-31-2015, 05:23 PM
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#20
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Bus Crazy
Join Date: Apr 2013
Location: Colorado
Posts: 2,356
Year: 1993
Coachwork: bluebird
Engine: 5.9 Cummins, Allison AT1545
Rated Cap: 2
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thanks for the tip!
i added a gallon of wally 2-stroke to the last tank and it quieted down nicely.
the cab noise was lowered enough to to hold a conversation without yelling.
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