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Old 05-06-2023, 11:11 AM   #1
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Motorhome - Exhaust Brake - Noise - Posted NO ENGINE BRAKE - Does this apply to RVs?

2008 Tiffin Phaeton 40' DP Motorhome Freightliner XC chassis
Cummings engine SN 46773230 ISC CM2150 8.3L 360HP
I have a exhaust brake on-off switch. There is no multi-level brake switch
Its hard to hear the engine when driving but when I use the exhaust brake I never hear the loud noise tractor/semis make.
I can feel the exhaust brake work and I can see an indicator on the freightliner display when it works.
When driving into cities, there are signs NO ENGINE BRAKES
I perceive that my RV doesn't have a loud exhaust brake like Semis
Question - should I turn off the exhaust brake when I'm in a posted area?
I am in Moab and I believe there's an 8 mile stretch posted as no engine brake some areas with significant grades and the exhaust brake would help between red lights.
Does a 2008 freightliner XC Cummins 360 HP exhaust brake make a loud braking noise?
If not, should RV'rs with similar set ups shutoff their exhaust brake where posted?
I'm sure there are experts that can provide guidance on IRV2.
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Old 05-06-2023, 11:17 AM   #2
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No noise because itis a different system than the big guys. Ignore the signs, not for you.
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Old 05-06-2023, 08:53 PM   #3
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I think there was only a very few ISC engines that had an engine brake; nearly all came with an exhaust brake.
This is an exhaust brake:


This is an engine brake, and is not visible because it's under the valve cover:
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Old 05-06-2023, 09:29 PM   #4
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Those warning signs apply to OTR tractors with loud straight pipes and do not apply to unmodified motor homes or diesel pick up trucks with either exhaust or engine brakes.
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Old 05-06-2023, 09:36 PM   #5
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When driving into cities, there are signs NO ENGINE BRAKES

You do not have an Engine Brake.......you have a Exhaust Brake

Ignore the Signage and use your Exhaust Brake
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Old 05-07-2023, 08:56 AM   #6
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Old 05-15-2023, 08:03 PM   #7
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Most, maybe all, MHs have exhaust brakes. I don't know of any pick-up with an engine brake. Engine brakes are pretty exclusively on large trucks only.
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Old 05-18-2023, 11:19 AM   #8
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Quote:
Originally Posted by KD4UPL View Post
Most, maybe all, MHs have exhaust brakes. I don't know of any pick-up with an engine brake. Engine brakes are pretty exclusively on large trucks only.


ISMís, and other big block Cummins, use engine brakes aka Jacobs Engine brakes or whoever owns them nowadays. NOT exhaust brakes.
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Old 05-18-2023, 12:06 PM   #9
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I believe many, if not all, ISL 9's equal to or greater that 400 hp have engine brakes. Tiffin puts a engine brake in their Phaetons on a PowerGlide chassis with the ISL 9-380 hp engine .

In any case whether an exhaust or engine brake in a motorhome neither one is loud enough to be an issue.
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