Engine/Transmission (1998.5 - 2002) True Jake-Brake Rumor

[Mundgyver]

Something interesting has come up and I am wondering if anybody else has heard this rumor? I was down at the Cummins Northwest this last week ordering some Extreme Duty Coolant for my truck. During the 15 minutes I was there the conversation drifted to exhaust brakes and Jake brakes. The tech on the counter mentioned that he had just gotten back from a seminar from Cummins and that the question had come up concerning a true Jake brake being fitted to the top of the 5. 9L engine that we use in our trucks. According to him the response from the factory rep was (We can neither confirm nor deny) type of thing, but with a big smile. So the question is, has anybody out there in the know, heard this rumor and is there any substance to it? A curious mind needs to know. Oo.

 

[esommer2500]

My Dad always told me that truck Jake brakes were really only used and effective in engines bigger than 11 liters. Don't know why, that's just what he told me. (He went to diesel school many, many moons ago, drove truck for about 10 years, then sold them for Intl. for another 6. )



I tend to believe most of what he tells me unless it is some late and breaking news... like this may be. Any idea on whether this would be available for both 12v and 24v?



Eric

 

[Mundgyver]

The understanding that the Cummins Northwest Counter Rep gave me was that when he asked the Cummins Factory Rep about it, that the answer was they were not allowed to talk about it. My guess would be that there is something in the works for the 5. 9 L Cummins. As to which model (12V or 24V), who knows? Maybe they are looking at the Hotshot haulers with an eye to their needs. Don't know. The fact that the Rep said, they can't talk about it is rather interesting though.

 

[JLinder]

There is a true Jake head that fits the ISB's, but you'd have to severely hack up the body to make it fit. Plus, I do believe that a true Jake head for our applications would be severe over-kill. You probably would lock up the tires as soon as it turned on.

 

[Gizmo 007]

I've heard tale of someone trying to put one on. Problem was, the exh. manifold was different, and the hood wouldn't fit anymore. Just hearsay, haven't seen it personally so don't quote me on it. Been about a year ago since I heard it.

 

[tgbol]

With the Gen 3 being electronically controlled. I am sure that some type of actuator can be used to open the exhaust valve when the injector is told to fire. Use the oil pressure to move a cylinder over the t-bar on the exhaust valves. When the injector is supposed to fire close a valve and the cylinder opens the valve instead.

 

[jtisdale]

Originally posted by tgbol

With the Gen 3 being electronically controlled. I am sure that some type of actuator can be used to open the exhaust valve when the injector is told to fire. Use the oil pressure to move a cylinder over the t-bar on the exhaust valves. When the injector is supposed to fire close a valve and the cylinder opens the valve instead.

Sounds good, maybe that will work as well as the factory high idle

 

[tgbol]

The non-Dodge applications have an high idle set up in the computer. It is controlled by the cruise control switches. I don't know where the tps is on the Gen-3 but, yes, you can adapt a high idle into it. Switch off the foot feed TPS and tell the computer how fast to run by sending the right voltage to it. I believe that is how the Practical Solutions system works. We have trucks at work that have secondary TPS on them so that we can control the engine from the crane seat.

 

[kaffine krazed]

Well they will have to find a way to offer a engine brake on the Cummins to keep up with Navistar. I know Navistar is working on camless engines using oil pressure to open the valves. Since that would give control of the valves to the ECM instead of a cam they would easily be able to add an engine brake.