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Old 03-08-2016, 07:39 PM   #15
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Quote:
Originally Posted by BrianGlenn View Post
....from the Jacobs company website:



"Jake Brake® is a registered trademark of Jacobs Vehicle Systems™...........The term correctly refers to all of Jacobs Vehicle Systems retarding products.....



Brian

Well, I stand corrected. Sorry. I guess I should check the source more frequently than every several years or so.
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Old 03-08-2016, 08:58 PM   #16
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The biggest difference between "engine brakes" and "exhaust brakes" is that engine brakes will slow you down when descending a steep hill and exhaust brakes will not.
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Old 03-08-2016, 10:38 PM   #17
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The biggest difference between "engine brakes" and "exhaust brakes" is that engine brakes will slow you down when descending a steep hill and exhaust brakes will not.

I agree that engine brakes are stronger- partly, I suppose, because they're usually installed on much larger engines- but I think it's a bit misleading to phrase it in absolute terms that way. In part it depends on your definition of steep.

What I can say is that I travel at about 35K Lbs, and my exhaust brake will hold me stable down a 6% grade. Now, throughout the west there are a good number of long (10 mile) 6% and 7% grades, and some even steeper- albeit shorter- in the east. All are eminently manageable with an exhaust brake. I think it's more a question of vehicle weight and engine size rather than one system being better than another.

Besides, those engine brakes are loud and it would scare the cat!
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Old 03-08-2016, 11:29 PM   #18
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Originally Posted by twinboat View Post
I hope you are simplifiying the operation, in your explanation.

A compression brake does not just hold the exhaust valves open.
YES

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Originally Posted by chris1953 View Post
The biggest difference between "engine brakes" and "exhaust brakes" is that engine brakes will slow you down when descending a steep hill and exhaust brakes will not.
I have an aftermarket 4" Exhaust Brake on my 2007 Dodge 5.9L Cummins.
Truck and 5vr weigh 22,000#
With EB On it will hold 45 mph going down a 6% grade w/o touch brakes
With EB On it will hold 55 mph going down a 7% grade with only occasional use of brakes.

BEST modification I did to truck.

I even use it when NOT towing.....course I have to press on go pedal occasionally or it will slow truck down to a crawl
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Old 03-09-2016, 07:50 AM   #19
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The biggest difference between "engine brakes" and "exhaust brakes" is that engine brakes will slow you down when descending a steep hill and exhaust brakes will not.
That's not my experience, but I don't think I've ever driven a vehicle with a real compression brake.

My Dodge truck and RV both have exhaust brakes. The pickup has a switch on the dash, when I turn it on and let off the gas the brake slows down the truck. The higher RPM the more pronounced the braking effect. Why would it only work on level ground and not going down hill? On the RV, I have a foot pedal to activate the brake. Same question works on level ground, but not going down hill?
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Old 03-09-2016, 02:06 PM   #20
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Apples against apples. The same truck with the same engine, carrying maximum payload. On the same down-hill run: 6%. Engine brakes will slow the truck; you would be lucky if an exhaust brake would hold a steady speed unless in a crawler gear.
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Old 03-09-2016, 02:37 PM   #21
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Compression brakes harness some of the engine's horsepower to actively slow down the vehicle. I think that for my 425 HP CAT, Jacobs claims that ~300HP can be used to slow it with the Jake brake.

In comparison, an exhaust brake is sort of a "passive" device. It constricts a vehicle's exhaust, creating a backpressure which provides engine braking, but it's not the same as using engine power for stopping.
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Old 03-09-2016, 03:10 PM   #22
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Many RVers don't know the difference between compression brakes and exhaust brakes to begin with.
docj
I agree.

For the benefit of those who want to know difference I suggest this read: http://tinyurl.com/jk6qhot

(Unfortunately those that refuse to have their minds changed by facts will probably not bother to read it).

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Old 03-09-2016, 03:20 PM   #23
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The exhaust brake is nothing more than an exhaust restrictor. It operates like a large washer, when activated, gets turned sideways in the exhaust to provide more engine braking. One side effect is if you have it on too long in will increase your intake manifold temperature.
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Old 03-11-2016, 03:24 PM   #24
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If you want to get all technical, it's a compression release brake. It opens a valve to relieve the product of the compression stroke leaving a vacuum in the following power stroke rather than allowing the compression to push the piston thru the power strok.
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Old 03-18-2016, 12:36 PM   #25
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Just to add to the discussion, an engine brake is built into the engine design, and operates internally within the engine. An exhaust brake is external and is not part of the engine design.
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Old 03-18-2016, 05:25 PM   #26
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Old 03-18-2016, 05:27 PM   #27
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Exhaust brake.


http://www.google.ca/search?q=exhaus...C&biw=1120&bih
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Old 03-18-2016, 05:28 PM   #28
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The biggest difference between "engine brakes" and "exhaust brakes" is that engine brakes will slow you down when descending a steep hill and exhaust brakes will not.
Can you show me where you get this?
Or do you mean that an exhaust brake will hold the descending speed constant. But the Engine brake will slow you down meaning speed will decrease.

Just curious because I have 40+ years with these different brakes in all differant types of trucks.
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