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Old 05-22-2016, 02:02 PM   #1
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The truth and facts about noise level in gas RV's vs DP's..

Well, heres the truth...I keep reading about how noisey it is in a gas compaired to a dp coach...

quotes like "We have to scream at each other to talk..

so I got a Db meter and headed out across the desert... keep in mind that city traffic is 85 db....
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Old 05-22-2016, 02:04 PM   #2
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http://www.gcaudio.com/resources/howtos/loudness.html




Decibel (Loudness) Comparison Chart

Here are some interesting numbers, collected from a variety of sources, that help one to understand the volume levels of various sources and how they can affect our hearing.


Environmental Noise

Weakest sound heard 0dB
Whisper Quiet Library at 6' 30dB
Normal conversation at 3' 60-65dB
Telephone dial tone 80dB
City Traffic (inside car) 85dB
Train whistle at 500', Truck Traffic 90dB
Jackhammer at 50' 95dB
Subway train at 200' 95dB
Level at which sustained exposure may result in hearing loss 90 - 95dB
Hand Drill 98dB
Power mower at 3' 107dB
Snowmobile, Motorcycle 100dB
Power saw at 3' 110dB
Sandblasting, Loud Rock Concert 115dB
Pain begins 125dB
Pneumatic riveter at 4' 125dB
Even short term exposure can cause permanent damage - Loudest recommended exposure WITH hearing protection 140dB
Jet engine at 100' 140dB
12 Gauge Shotgun Blast 165dB
Death of hearing tissue 180dB
Loudest sound possible 194dB


OSHA Daily Permissible Noise Level Exposure
Hours per day Sound level
8 90dB
6 92dB
4 95dB
3 97dB
2 100dB
1.5 102dB
1 105dB
.5 110dB
.25 or less 115dB




NIOSH Daily Permissible Noise Level Exposure
Hours per day Sound level
8 85dBA
6 86dBA
4 88dBA
3 89dBA
2 90dBA
1.5 92dBA
1 94dBA
.5 97dBA
.25 or less 100dBA
0 112dBA


Perceptions of Increases in Decibel Level
Imperceptible Change 1dB
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Old 05-22-2016, 02:07 PM   #3
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I also have a video loading..
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Old 05-22-2016, 02:24 PM   #4
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if you note , normal conversation is at 65-70 db






Decibel (Loudness) Comparison Chart



Environmental Noise

weakest sound heard 0 dB
normal conversation at 3-5 ft 60-70 dB
dial tone of telephone 80 dB
city traffic inside car 85 dB

1983 OSHA monitoring requirements begin 90 dB

train whistle at 500 ft. 90 dB
subway train at 200 ft. 95 dB
regular sustained exposure may cause permanent damage 90-95 dB
power mower 107 dB
power saw 110 dB

Pain begins 125 dB

pneumatic riveter at 4 ft. 125 dB
jet engine at 100 ft. 140 dB
loudest sound that can occur 194 dB


Musical Noise

normal piano practice 60-70 dB
fortissimo singer 3 ft. away 70 dB
chamber music in small auditorium 75-85 dB
regular sustained exposure may cause permanent damage 90-95 dB
piano fortissimo 92-95 dB
violin 84-103 dB
cello 82-92 dB
oboe 90-94 dB
flute 85-111 dB
piccolo 95-112 dB
clarinet 92-103 dB
french horn 90-106 dB
trombone 85-114 dB
timpani & bass drum rolls 106 dB
average Walkman on 5/10 setting 94 dB
symphonic music peak 120-137 dB
amplified rock music at 4-6 ft. 120 dB
rock music peak 150 dB


NOTES:
•The brass section playing fortissimo can drown out practically the whole orchestra.
•One-third of the total power of a 75-piece orchestra comes from the bass
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Old 05-22-2016, 03:26 PM   #5
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Could you provide some reading while the coach is climbing a 6% grade and the tach pushing about 5K RPM?
I believe there is only a mild difference between a gas coach and a DP at 62 MPH on level ground. The real difference is ascending steep grades.
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Old 05-22-2016, 03:34 PM   #6
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Quote:
Originally Posted by Selah View Post
Could you provide some reading while the coach is climbing a 6% grade and the tach pushing about 5K RPM?
I believe there is only a mild difference between a gas coach and a DP at 62 MPH on level ground. The real difference is ascending steep grades.
I think I have 10 or so videos showing me pulling a 22' loaded box trailer up a 6% grade...but the videos show me going 20 mph faster that the 350 hp diesel... but none are at 5000 rpms....

all the videos i'm talking in my normal voice....
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Old 05-22-2016, 03:35 PM   #7
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heres the video with the meter...


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Old 05-22-2016, 03:35 PM   #8
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Quote:
Originally Posted by Selah View Post
Could you provide some reading while the coach is climbing a 6% grade and the tach pushing about 5K RPM?
I believe there is only a mild difference between a gas coach and a DP at 62 MPH on level ground. The real difference is ascending steep grades.
exactly. Or you can just look at the other video he posted of climbing a grade in that RV where the engine is screaming the whole time.
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Old 05-22-2016, 03:51 PM   #9
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Old 05-22-2016, 04:00 PM   #10
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exactly. Or you can just look at the other video he posted of climbing a grade in that RV where the engine is screaming the whole time.
here's with the magnaflow muffler

it was too quiet for me..

diesel pusher... 100k more... ear plugs 1.00 at the dollar tree..

no kool aid for me .... thanks though

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Old 05-22-2016, 04:06 PM   #11
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Quote:
Originally Posted by Selah View Post
Could you provide some reading while the coach is climbing a 6% grade and the tach pushing about 5K RPM?
I believe there is only a mild difference between a gas coach and a DP at 62 MPH on level ground. The real difference is ascending steep grades.
you have to do the test apples to apples ...in the video, I went up the hill 60 mph with my gas coach..


in the video I went up it 37 with a journey dp 350 hp


it I go up the hill 37 mph... the motor doesn't make much noise...


but i'm gonna check... interesting post...

but maybe it will still be the same because of it will be in 2nd gear???
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Old 05-22-2016, 04:13 PM   #12
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exactly. Or you can just look at the other video he posted of climbing a grade in that RV where the engine is screaming the whole time.
no doubt the gas motor in front is gonna be louder..but also the diesel motor in front is louder than the gas..... the diesel is louder in the bedroom..


I got up to 78db pulling the grade....

heres the facts though...

gas is faster to take off...
gas is faster to stop

gas is faster 40mph-60mph..

these are with the older v-10's
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Old 05-22-2016, 04:17 PM   #13
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Lol!

It never ceases to amaze me the lengths which some people will go through to justify their opinion.

I've driven gas and diesel coaches. I have no doubt that on level ground they would be very similar, because all you're hearing is the wind noise.

On steep grades, there is absolutely no comparison. You can't hear yourself think a gas coach with the engine roaring away at 4000+ RPM just 12 inches from your feet. On the same grade you don't hear the engine at all in a diesel.

Case closed.
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Old 05-22-2016, 04:17 PM   #14
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It sounds like the OP has an axe to grind. Every RV is different. Some have better sound insulation at the doghouse than others.

I can say from my own personal experience that you could not have a normal conversation with my Winnebago Adventurer on a Workhorse chassis. It wasn't too bad a lot of the time but on hot days when those twin cooling fans kicked in it was uncomfortably loud. Could we have improved that situation, probably so but other factors became more important than the noise factor. We decided to go FT and decided we wanted bigger and have more CCC and axle capability that what we had with the workhorse. In short, there is no comparison when it comes to noise in MY experience between OUR gasser and OUR DP.

So, for the OP I am very happy that their coach meets their needs and provides enjoyment. This isn't a belly bumping contest of trying to say mine is better than yours. OTOH, I am very happy with our choice and our experience is the opposite of the OP's.

YMMV!
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