DO IT!!!! and go straight to adapting it to a 24v head, so I can have one!

 

getting one to fit on the head is just one problem, actuation and timeing it is a whole 'nother ball of wax. You have to override the exahust valve timeing with a jake brake............


but that said, you build one I'll buy one. It's NOT only benefitial for heavy loads, but offroad too. with a stick you'd never really have to use the service brakes at all. Use it around town to extend brakelife dramatically, but most municipalities have bylaws that outlaw the use of engine retarder brakes within corporate city limits......if you get caught

 

Yeah, but the cops would be looking for a big truck and you'd just slip on by with the Jake off if you saw a cop.

 

you wont be able to design a engine brake to work on the ISB unless you design the block to handle roller cam and lifters, the flat tappet cam cannot handle the jake requirements , The 8.9 ISL always came with jake add on, the 8.3 ISC finally came with jakes add on when the CM850 common rail block came with roller cam and lifters.

 

How so? I need as much information on this one as I can possibly obtain. Why won't the flat tappet work with a jake? (Not being rude just trying to understand.) Does anyone make a roller cam for the ISB motor? Is there one that could be adapted to work? Thanks!

 

This is an idea that ive had for a while and i would like to see someone carry it through. I will eventually try it on my 12v when i get the money. Im gonna have to replace the head soon so the old head will be a perfect project, and i have a large tractor trailer junkyard near my house so i could get a head from a rig and start from there. Hopefully someone can give some helpful info on this subject.

Oh and the jake in the videos have nothing on the truck i have drove for a friend that owns a grading and hauling bussiness. Just imagine a 2004 quad axle T-800 KW dump truck with a C15 Cat, 8" bull haulers w/ no mufflers whatsoever (DOT really loves him ) and a 3 stage jake. The truck will literally rattle the windows in buildings as it goes by i know that for a fact, and hes got another truck just like it with a cummins and a 3 stage jake that is loud as he** too. God i love those trucks. Hopefully ill have a permanent position in one of these soon.

 

flat tappet or roller makes NO DIFFERENCE at all as far as the jakes go the biggest problem is that most jakes are injector rocker actuated being that when the injector rocker goes up it pushes a plunger that in turn opens the exhaust valve turning the engine into a large air compressor. the probblem is that the 5.9 doesn't have injector rockers and cummins doesn't make a crosshead for the exhaust valves that would work on the 5.9 that I am aware of. and I doubt the engine has sufficient oil pressure to actuate the valves purely electronically.

With that being said good luck on your project.

P.S. I have some old jake housings laying around if you want one P.M. me and we can work something out.

 

Given the way the exhaust brakes work, I'd be happy with the performance they offer in a pickup application.

There's nothing wrong with trying to make this project work, however. Good luck.

 

Diesel Doc is right on the money.

The only way without a cam actuated injector I see it even vaguely possible is to create a signal to the ECM to shut off fueling to the injector. Another signal to fire the solenoids for the jake. As you know, electronic injectors in the ISB only became available with the common rail. On top of that, I would be concerned about oil pressure ability, strength of the rocker assembly, and the flow rate and capacity of oil in the jacobs rail that it would take in order to activate.

Also, the housing on mosts will add up to 4" or more in height to the top of the engine.

Good luck on the project. It will be a tough one.

 

Mopar440>> just remember "persistance breaks resistance" if it meant to be you will find a way, but make sure you have a plan "B" in place so you don't end up repeating your course next year.

 

well that is the case with the Jake brakes on a Cummins,, BUT what about the Jakes on a CAT?? there is no INJECTOR rocker... remember they are injected by and Injector pump on the side of the engine the cat unlike the cummins hase a true injector pump with a Nozzel goin into the head... not like the cummins rocker actuated injector with a variable pressure pump also called a injector pump.. so yes the jakes can work from exhaust valve timing as the case on a Cat engine.. just my two cents..

 

CAT hasnt used an injector pump on there truck engines since the PEEC engine. All since have been MEUI injectors. Never worked on the old mechanicals so I cant say.

 

you are correct Monty I was going to add that you probably wouldn't have roomto raise the valve cover any for the added height anyway.

And as far as the whole cat deal goes they run off of the injector rocker now also. ever since the early 90's the cat's have been more of a standard jake. I will look thru some of my older cat manuals and see what i find tommorow if I get time. If you could get this to work I doubt it would be very efective due to the limited displacement of this engine although the higher rpm capabilty may make up the difference.

 

I just talked to my dad about this project and he said that back in the day, Mack had a similar design as the 5.9L and Mack had its own compression brake that wasn't a "Jake" brake. Can't remember the name of the brake, but it started with "Dyna."

 

Dynatard rings a bell. If you want info about the older Macks go here

You might have to think outside the box a little but it would be a cool project.