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04-12-2017, 07:44 AM
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#1
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Junior Member
Join Date: Apr 2017
Posts: 2
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Excessive engine noise in cabin
When transmission downshift, the noise level increases. Our unit has a Ford V-10, 365 HP. Any suggestions.
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04-12-2017, 07:51 AM
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#2
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: May 2016
Location: Kamloops, BC, 60 miles from the Center of the Universe according to the Rinpoche, of the SF monks.
Posts: 7,395
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Is this something new, or has it been like this from new?  Engine noise will naturally increase when RPM's increase, but if it's new maybe look at the motor mounts or exhaust system for leaks.
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Happy Glamping, Norman & Elna. 2008 Winnebago Adventurer 38J, W24, dozens of small thirsty ponies. Retired after 40 years wrenching on trucks! 2010 Ford Ranger toad with bicycles or KLR 650 in the back. Easy to spot an RVer, they always walk around with a screwdriver or wrench in one hand! 
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04-12-2017, 07:57 AM
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#3
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Senior Member
Tiffin Owners Club
Join Date: Jul 2016
Location: Where we park it!
Posts: 13,145
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Poppa welcome to the form.
You might want to ask this question for more complete answers in the General discussion thread where it will be seen by more folks. http://www.irv2.com/forums/f84/
This thread is more for introductions.
Again welcome
momdoc
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momdoc
2018 Tiffin Allegro RED 37PA
2020 JEEP Trailhawk
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04-12-2017, 08:53 AM
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#4
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Senior Member
Outdoors RV Owners Club
Join Date: Oct 2016
Posts: 1,804
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__________________
2018 ORV 24KTS 30,000+miles
2017 Ford 3.5 TwinTurbo w/MaxTow
640 Watts solar/600 Ahr
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04-12-2017, 09:00 AM
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#5
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Senior Member/RVM #90
Monaco Owners Club
Join Date: Nov 2002
Location: Columbus, MS
Posts: 54,780
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Hi !  Welcome to IRV2! We're sure glad you joined the gang! 
Sorry I can't help with your problem! Keep her between the ditches!
Good luck, happy trails, and God bless!  
__________________
Joe & Annette
Sometimes I sits and thinks, sometimes I just sits.....
2002 Monaco Windsor 40PBT, 2013 Honda CRV AWD
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04-12-2017, 03:05 PM
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#6
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Community Moderator
Newmar Owners Club
Join Date: Feb 2011
Location: Point Pleasant Beach, NJ
Posts: 31,546
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Glad to have you here in the forum with us.
If this is a new sound check the exhaust manifold and pipes. Can you describe the noise? Clicking, roaring etc.
Happy Trails!!!
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Tony & Ruth........... FMCA#F416727
2016 London Aire 4519, Freightliner chassis, Cummins ISX, 2018 Jeep Wrangler Unlimited, Blue Ox Avail with AF1. TST 507 TPMS
No amount of money can buy you an extra second of time.
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04-14-2017, 04:58 AM
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#7
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Senior Member
Thor Owners Club Ford Super Duty Owner
Join Date: Jul 2011
Posts: 3,796
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Sound proofing the engine cover will help, a lot. Prior owner added the material so I don't know the details concerning material or installation procedures.
The V10 power is in a higher RPM range and the power train computers are programmed to downshift as needed to get the most out of the engine. But you have to keep in the back of your mind that the Ford chassis is used on multiple applications not just RV's so Ford programs for a balance of use across multiple applications.
Another option is to purchase a tuner such as what Banks or 5 Star sells which will change the shift pattern to keep the engine RPM a bit lower. What some of us are wondering about is why Ford programming skips 4th gear on both up and down shifts. A tuner will bring 4th back into the pattern along with holding the coach in O/D and 5th a little long before dropping into lower gears as needed.
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04-14-2017, 05:21 AM
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#8
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Senior Member
Join Date: Mar 2012
Posts: 224
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Yep. 5 Star tuner helped immensely. That's a $400+ cure.
Extra sound barrier under the dog house would likely help, I didn't try that. Probably a lot less than $400.
Ultimately I cured the problem (and many others) by trading for a TT. Now I travel in the comfort of my daily driver. Cost me a bit more than $400...
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2023 Entegra Odyssey 26M
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04-14-2017, 07:03 AM
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#9
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Registered User
Ford Super Duty Owner
Join Date: Nov 2014
Location: NW Ohio
Posts: 7,114
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Like Sweatbriar, I added noise / heat pad to my old Mirada, made a difference in noise and heat.
ALSO - I found several large openings in the firewall to cabin that was letting in a lot of cold air, and noise. I used spay expanding foam to plug these holes.
Sound deadening and heat shield | 2001 Coachmen Mirada 300QB
..
The best way to find these air leaks is to sit inside the MH on a very cold and windy day. (i.e. minus 10 degrees and wind blowing at 30 mph) You'll find the air leaks real fast.
I just found a big air leak on my New-to-Me Southwind.
http://www.1999southwind.com/plugging-air-leaks/
..
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04-14-2017, 07:18 AM
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#10
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Senior Member
Join Date: Apr 2010
Posts: 1,295
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I was able to quiet the sound, but not much, by insulating the dog house. I just used pink insulation and a foil insulation. There are insulation pads available and they might work better. You may find a insulation blanket to put over the engine but I was concerned about the engine heat so I did not do it. The engine makes its power with rpm so it is just loud.
I also found gaps around the dog house which I sealed. My ultimate solution was a DP.
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Pcurt
2007 Fleetwood Bounder 38V
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04-14-2017, 07:25 AM
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#11
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Registered User
Join Date: Apr 2014
Location: Victoria, BC
Posts: 848
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Our cockpit is considerably quieter after installing the 5 Star Tune. The rig now downshifts from 5th to 4th rather than screaming down to 3rd gear. Obviously on a steep incline it will eventually go down to third and maybe second but these are predictable shifts in the mountains. We can now carry on normal level conversations in the cockpit.
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04-14-2017, 07:25 AM
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#12
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Senior Member
Winnebago Owners Club Ford Super Duty Owner Coastal Campers
Join Date: Apr 2010
Posts: 170
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Quote:
Originally Posted by momdoc
Poppa welcome to the form.
You might want to ask this question for more complete answers in the General discussion thread where it will be seen by more folks. http://www.irv2.com/forums/f84/
This thread is more for introductions.
Again welcome
momdoc |
WHAT? This is the Ford Motorhome Chassis Forum. 
__________________
2012 Itasca Suncruiser 37F, F53, Safe-T-Plus
Brake buddy
2007 Honda CR-V
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04-14-2017, 09:22 AM
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#13
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Senior Member
Join Date: Jul 2010
Location: FT on the Road
Posts: 3,839
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Quote:
Originally Posted by Poppa Jack
When transmission downshift, the noise level increases. Our unit has a Ford V-10, 365 HP. Any suggestions.
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Would also help a lot if we knew what brand/model/year you have.
% star tune will help with the 5 to 3rd gear downshift but doesn't really help with soundproofing.
My '16 Bounder was helped significantly with additional soundproofing (sealing all those open gaps on the firewall), doghouse soundproofing and 5 star tune. So significant in that I was going to sell my brand new unit to now I am comparing the sound levels to almost a DP. No cost for the work done by Fleetwood and minimal cost for the 5 Star Tune. CHF and an RSSA makes this handle super.
Very happy with the upgrades.
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Cheers!
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04-14-2017, 09:27 AM
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#14
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Senior Member
Country Coach Owners Club Solo Rvers Club iRV2 No Limits Club
Join Date: May 2011
Location: Vancouver, WA
Posts: 37,725
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First
Yes a front engine gas unit is noisy when the engine is working hard. More insulation, and a 5 Star will help, but it'll still be somewhat noisy.
__________________
2009 45' Magna 630 w/Cummins ISX 650 HP/1950 Lbs Ft, HWH Active Air
Charter Good Sam Lifetime Member, FMCA,
RV'ing since 1957, NRA Benefactor Life, towing '21 Jeep JLU Rubicon Ecodiesel
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