Jacobs "ENGINE" brake question vs Jacobs "EXHAUST" brake

[CRuD]

PLEASE BEAR WITH ME ON THIS.

If you don't known then PLEASE don't post a reply.

The exhaust brake slows down the exhaust gases from exiting the engine, which slows down the engine. Yes ? No? yes is my anwser.

The engine brake is internal of the engine and cuts the fuel off to the engine. Yes? No? Again yes is my reply. I know there is much more to it then I have touched on.

Thanks gents. I told a few of the folks at work that I have a Jacobs Exhaust brake on my truck and they thought it would be loud. I tried to explain and wanted to make sure I was not passing on "BUM SCOOP"

Thanks again

See Ya

Chris

 

[Gizmo 007]

You're right. The exhaust brake traps the exhaust gas. The Engine brake (like on 18 wheelers) open the exhaust valves slightly, while cutting off the fuel, causing the engine to actually stall, creating dead weight. Hope this helps.



BTW - The exhaust brake is not very loud. The engine brake is deafening.

 

[Joe G.]

Maybe an expert will come in here, but from earlier posts I've read the engine brake works by manipulating the exhaust valves not fuel. When decellerating there is no fuel being delivered so the brake can't work by cutting off fuel. Again from earlier posts, a real engine brake won't fit under the hood of the Dodge even if one were available for our engines.



An exhaust brake works by closing off the exhaust system with a butterfly valve. It's not nearly as noisy as the engine brake which barks whenever the exhaust valve opens.

 

[Mr. C]

Both systems restrict the flow of exhaust from the engine.

The exhaust brake is by far the most simple route to restrict the spent fumes, all it requires is a butterfly valve in the exhaust stream ( very inexpensive ).

The engine brake is actually a part of the valve train and is much more complicated and more powerful as it holds the exhaust valves closed on individual cylinders (generally you can select how many cyl's you want to activate thus giving more or less braking horsepower) and is very expensive. To my knowledge there are no engine brakes available for our little buddy the B series. It would take a lot of long green for the engineering and tooling to make it happen.

Basically your engine is just turned into a big air compressor. And neither of the systems are designed to opperate untill your foot is off the go peddle .



Hope this helps.

 

[klenger]

http://www.jakebrake.com/products/engine/theory.htm

 

[trning]

eng brake

actually the eng brake works by opening up the ex valves at the top of the compression stroke releasing the compression so there is no combustion only the drag of the pistons comming up to compression. With out the high compression the fuel won't burn.

 

[EMDDIESEL]

I had read there was talk of Jacobs making an engine brake for the ISB. Then i heard the idea was canned since there would not be enough hood clearence. Is this idea totally dead? If nobody knows for sure, i am calling them tommorow to find out

 

[CRuD]

Thanks for the great answers.

I have the info I was looking for.

See Ya

Chris