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Old 10-18-2021, 10:27 AM   #1
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Engine brake noise restrictions

I have a 42 Tiffin Phaeton with a 400hp Cummins with an engine brake(Jake brake). Occasionally I see signs restricting engine brake use. I assume this is related to noise. When I use mine, I am not aware of any increased noise but the engine/exhaust is 30-40 feet away. Is it sufficiently muffled? Do I need to observe the engine brake restrictions if I am not making a lot of noise?
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Old 10-18-2021, 10:29 AM   #2
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No clear cut answer.


Many restrictions are for UNMUFFLED engine brakes.


Yes, some just say no engine brakes.


You also have to weight off noise/legal issue vs safety. Said another way, many towns in the Rocky Mountains are at the bottom of steep grades. IMO, here safety trumps noise.
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Old 10-18-2021, 10:37 AM   #3
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The engine brake on our coaches is well muffled and will just sound like you have geared down. As Brett said, most apply to unmuffled engine brakes like you hear on some trucks.
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Old 10-18-2021, 10:41 AM   #4
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It seems the thing to do now days on the semi tractors is to put as big of exhaust pipes as possibly and no mufflers to see how loud they can make their exhaust brakes. Most towns around here are putting up these signs and at 30-40 mph on flat ground why do you need to use an exhaust brake?
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Old 10-18-2021, 12:22 PM   #5
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I generally flip mine off when driving through a town. Don't really need it below 40 mph.

That said, these coaches are well muffled so it doesn't really make any excess noise. Especially on the low setting.
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Old 10-18-2021, 12:41 PM   #6
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Is there anything as annouying as a Diesel with a loud Jake brake?
Ok Harleys with no mufflers and pick ups with loud exhaust.
Silence is Golden...
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Old 10-18-2021, 12:44 PM   #7
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Quote:
Originally Posted by Fiesta48 View Post
Is there anything as annouying as a Diesel with a loud Jake brake?
Ok Harleys with no mufflers and pick ups with loud exhaust.
Silence is Golden...
Most people heh
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Old 10-18-2021, 12:52 PM   #8
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“Jake Brake” refers to compression release engine brakes. A feature on large diesel-powered vehicles like semi-trailers, it works by releasing the compressed air in the engine via the exhaust valves to quickly reduce speed, resulting in a loud noise.


Jake Brake on Motorhomes ARE NOT engine compression releases but are exhaust restrictors and are fairly quiet.

Signage does NOT apply to 'exhaust braking'
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Old 10-18-2021, 01:01 PM   #9
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Originally Posted by Old-Biscuit View Post


Jake Brake on Motorhomes ARE NOT engine compression releases but are exhaust restrictors and are fairly quiet.

Signage does NOT apply to 'exhaust braking'

First sentence is NOT correct. Suspect the OP's Cummins ISL does have an engine compression brake/jake brake. Yes, that engine could be ordered either way, but I know our 2003 ISL had the two stage engine compression brake. With ISL (8.9 liter) and larger engines engine compression brakes are pretty much universal.



Agree with second sentence-- the noise restrictions are not aimed at exhaust brakes.
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Old 10-18-2021, 01:22 PM   #10
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Quote:
Originally Posted by Old-Biscuit View Post
“Jake Brake” refers to compression release engine brakes. A feature on large diesel-powered vehicles like semi-trailers, it works by releasing the compressed air in the engine via the exhaust valves to quickly reduce speed, resulting in a loud noise.


Jake Brake on Motorhomes ARE NOT engine compression releases but are exhaust restrictors and are fairly quiet.

Signage does NOT apply to 'exhaust braking'
The Cummins I15 in my MH has a 3 stage Jake Brake.
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Old 10-18-2021, 01:30 PM   #11
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Virginia Regulations

I found this memo and found it interesting the State went the other way (in 2003), namely removing the signs. Can anyone confirm this is still true? If someone is generating "too much" noise, give them a ticket.

http://virginiadot.org/business/reso...tion_Signs.pdf
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Old 10-18-2021, 01:30 PM   #12
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Originally Posted by wolfe10 View Post
First sentence is NOT correct. Suspect the OP's Cummins ISL does have an engine compression brake/jake brake. Yes, that engine could be ordered either way, but I know our 2003 ISL had the two stage engine compression brake. With ISL (8.9 liter) and larger engines engine compression brakes are pretty much universal.



Agree with second sentence-- the noise restrictions are not aimed at exhaust brakes.
Quote:
Originally Posted by GWBGE View Post
The Cummins I15 in my MH has a 3 stage Jake Brake.
My mistake.........

Unlike Semi-trucks the ones on MH are muffled vs open air releases
Quieter and Signage does NOT apply
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Old 10-18-2021, 01:36 PM   #13
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Could the restrictions be intended for commercial vehicles? I can't see pulling over grandpa and grandma in their RV for using a quiet engine brake in the name of safety.
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Old 10-18-2021, 03:12 PM   #14
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Could the restrictions be intended for commercial vehicles? I can't see pulling over grandpa and grandma in their RV for using a quiet engine brake in the name of safety.
Regardless of the letter of the law, and the intent of the people who passed it... as with most noise based laws, a little common sense goes a long, long way...

Obviously, an overzealous LEO on a mission, can ruin anybody's day. While they are out there, they are certainly in a minority of the officers... I say that as an LEO with 31 years under my belt.

If you are not doing something outlandish, and really drawing attention to yourself..... In most cases you will be left alone...

I've been riding Harleys since 1978. I currently have 3 Harleys and they all have performance mods as all my bikes have had. All three current bikes have modified exhaust systems. I'm not about making noise, but performance exhausts tend to be louder than OEM, especially on Harleys.

I have yet to be pulled over for my exhaust(s)... that includes the beach areas of CA, where many Departments are on a mission to enforce noise restrictions...

I don't race around in crowded areas, I don't blip my throttle every chance I get, and I don't "make noise" to try and get people to look at me...

I suspect the same is true of "exhaust brake" laws.... a little common sense goes a long way...
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