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08-30-2016, 05:44 PM
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#1
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Member
Monaco Owners Club
Join Date: Aug 2009
Location: Elon N.C.
Posts: 53
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8.1 Vortec Roar
Engine has a roar that comes and goes at highway speed, what the hell is it
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08-30-2016, 07:41 PM
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#2
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Senior Member
Join Date: May 2013
Location: Chester, VA/Zephyrhills, FL
Posts: 1,330
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Cooling fan kicking on and off.
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Tom and Gloria 2022 Newmar Dutch Star 4081, TOAD: 2017 Buick Enclave/2023 GMC Sierra Denali, Blue Ox Towbar, Baseplate and M&G Braking System
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08-30-2016, 07:45 PM
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#3
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Senior Member
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 31,495
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Quote:
Originally Posted by TomandGloria
Cooling fan kicking on and off.
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When the thermal hub in the rad fan gets air at a certain temperature coming through the rad , it ramps up to full RPM to aid the cooling.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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08-30-2016, 08:09 PM
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#4
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2002
Location: Clovis, CA, USA
Posts: 13,151
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Does it occur when hot outside and you are climbing a grade?
Probably normal, cooling fan kicking in.
__________________
2004 Monaco La Palma 36DBD, W22, 8.1, 7.1 MPG
2000 LEXUS RX300 FWD 22MPG 4020 LBS
Criticism is easier than Craftsmanship
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08-30-2016, 08:12 PM
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#5
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Senior Member
Monaco Owners Club Workhorse Chassis Owner
Join Date: Aug 2006
Location: MotherLoad foothills approx.60 m.s east of Sacramento
Posts: 1,281
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It sounds like a jet airplane engine, nothing is wrong. The system is working as designed. Scared the hell out of me the 1st time it happened.
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Full time since Nov 2012 RVM#41 Gary and Marian Hill 2001 Monaco Dynasty Jack 38' 370 hp ....If it ain't broke I can still fix it.
Like putting shoes on an octopuss, so are the days of our lives.... 
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08-30-2016, 09:23 PM
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#6
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Senior Member
Workhorse Chassis Owner
Join Date: Jun 2006
Location: Northwestern Montana
Posts: 3,514
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Installing a 180 degree thermostat helps with the noise. It doesn't eliminte it, just doesn't roar as often, or as loud and long as it does when the engine is equipped with the stock 195 degree thermostat.
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Dieselclacker
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09-11-2016, 05:32 AM
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#7
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Senior Member
Join Date: Jul 2015
Location: Watertown NY USA
Posts: 6,531
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Quote:
Originally Posted by dieselclacker
Installing a 180 degree thermostat helps with the noise. It doesn't eliminte it, just doesn't roar as often, or as loud and long as it does when the engine is equipped with the stock 195 degree thermostat.
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I would NOT recommend changing to a lower temperature thermostat. This engine with all it's sensors and a computer is designed to run at the 195 deg. level. Running too cool can and will lead to poor mileage, engine sludge build up, carbon build up and possible catalytic converter failure.
Once you know what causes the roar you should rest assured everything is working as it was designed to.
Lynn
__________________
2002 Fleetwood Storm 30H on Workhorse P32 chassis 8.1 gas.
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09-11-2016, 07:28 AM
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#8
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Senior Member
Workhorse Chassis Owner
Join Date: Jun 2006
Location: Northwestern Montana
Posts: 3,514
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Quote:
Originally Posted by LETMGROW
I would NOT recommend changing to a lower temperature thermostat. This engine with all it's sensors and a computer is designed to run at the 195 deg. level. Running too cool can and will lead to poor mileage, engine sludge build up, carbon build up and possible catalytic converter failure.
Once you know what causes the roar you should rest assured everything is working as it was designed to.
Lynn
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After running a 180 degree thermostat in my 8.1 Workhorse for over seven years, I can state with confidence that none of the anticipated problems you list in your post above have occurred.
The only downside I have observed is lower cab heater output temperature.
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Dieselclacker
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09-16-2016, 06:45 PM
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#9
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Senior Member
Monaco Owners Club National RV Owners Club Workhorse Chassis Owner
Join Date: Dec 2013
Location: St. Charles MO
Posts: 4,920
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I don't find the the so called roar that bad. After running up and down some 7* grades on ark. 65 it only kicks in for maybe 60sec. I like knowing that is working and that is what it is deigned to do. The temp. Never changes. Now when it doesn't kick in then it will bother me.
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2002 Monaco Windsor 40PST 2019 Equinox 1.5L, Blue OX Aventa LX tow bar, Roadmaster EZ5 baseplate, SMI Stay-In-Play Duo, TireSafeGuard TPMS
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09-16-2016, 06:54 PM
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#10
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Senior Member
Outdoors RV Owners Club
Join Date: Oct 2014
Posts: 3,539
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I agree that a lower temp thermostat is not a good idea. The computer is calibrated for a higher operating temp and the engine is most efficient at that temp. It affects the air/fuel ratio and also the catalytic converters. Just because you did not notice anything does not mean these things did not happen, just means you did not notice them. Also known as anecdotal evidence and is the lowest form of data scientifically.
Lots of engineers design engines these days and they all agree on 195 degree thermostats.
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09-16-2016, 08:10 PM
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#11
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Moderator Emeritus
Damon Owners Club Workhorse Chassis Owner
Join Date: Mar 2012
Location: Lone Star State
Posts: 19,203
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For the OP...just so it is written...
The cooling fan on the front of the engine is always turning. But at speed, the fan hub lets it slip and is therefore quieter. When demanded by engine temp, the fan hub locks and turns the fan at full speed of the engine (by way of the serpentine belt) which is louder due to the high capacity of the fan.
That's the way it is supposed to work and reduces the need for a supplemental electric fan sometimes seen on the front of other truck radiators.
Safe Workhorse Travels
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03-09-2017, 06:43 PM
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#12
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Senior Member
Join Date: Feb 2016
Posts: 665
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Do you have a back up or rear camera with volume control if so turn off?
__________________
Larry and Sheila 2008 Fleetwood Discovery 39R
Retired U.S. Air Force (SAC) Vietnam Veteran
2022 RAM 1500 5.7 HEMI
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03-11-2017, 09:56 AM
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#13
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Member
Join Date: Feb 2017
Location: Deer Island , Oregon
Posts: 43
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The first time mine did it, I knew right away what it was. To me it wasn't loud at all because when the fan on my old 1992 Bounder kicked on it sounded like you were inside of a jet engine 
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Dean , Erika and Roscoe, the flat coat retriever
2004 Southwind 36E ,W22
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03-11-2017, 11:41 AM
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#14
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Senior Member
Join Date: Feb 2016
Posts: 665
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Understand thanks
__________________
Larry and Sheila 2008 Fleetwood Discovery 39R
Retired U.S. Air Force (SAC) Vietnam Veteran
2022 RAM 1500 5.7 HEMI
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