"Jake Brake"
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Senior User
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From: Duluth
"Jake Brake"
Whoops posted this in the 94-97ish diesel section first and thought it was here, but here it goes again
Also know as retarder, basically turns the engine into an airpump when on, so why is it that with our trucks, 7.3 diesels, we haven't got some wizard setting up oneof these for us, does it require a reliev valve or something to be put in? or will just shutting off cylnders selectively do the trick, and hey if we can do that why not set our trucks up like these newbie cars where at speed we can just shut off half the cylinders, and save lots of fuel, like having a 222 four cylinder? or am i plain nuts............to much coca-cola
Also know as retarder, basically turns the engine into an airpump when on, so why is it that with our trucks, 7.3 diesels, we haven't got some wizard setting up oneof these for us, does it require a reliev valve or something to be put in? or will just shutting off cylnders selectively do the trick, and hey if we can do that why not set our trucks up like these newbie cars where at speed we can just shut off half the cylinders, and save lots of fuel, like having a 222 four cylinder? or am i plain nuts............to much coca-cola
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From: Duluth
what?
well see this thread could be split into two parts, one the jakebrake, the other a selective shut down mode thread, no I am not being a smart a**, wht not, who says a small displacement engine would be as loud as a class A truck?
Post Fiend
Joined: Jul 2005
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From: 21791
Well smart *** if that is the only option left, because i KNOW im not cool, i dont even try to be. There is just so much R&D and custom stuff, aside from electronics to control it, that to make one unit on 8 cylinders on a Vee shaped engine, it would cost well over $100,000 in parts, labor, computer machining and electronics just to get it. Then there's the space issue, stuff is tight at the rear on both sides, couldnt be more than an inch or so taller than stock, you'd need to fabricate new valve covers you could still get ON the heads in the truck, the injector armature would get in the way BIG time, etc. You would also need access to a foundry and very extensive machine shop... Ive examined the Jacobs brake on the Series 60 detroit engines, and the valve cover is a good 6-8" tall, a good 4" taller than normal if the engine didnt have the system. Thats fine under a HUGE hood where there is plenty of room. Did you post just to point out the fact im a smart ***, or did you have something useful to add?
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From: Duluth
no need to be angry
see people talk about putting a 466 in thier truck all the time, doing all kinds of things, hey if i did it, who says I don't know what I am doing when it comes to machining and casting? castings are production pieces anyhow made to keep cost down, and HOW BIG is a DETROIT 60 series engine, i rest my case, hey if you can't find something nice to say, then don't say anything at all. did I hurt your feelings by suggesting something? maybe I will just have to try harder, failure be damned. AND ITS JUST AN IDEA GET OVER IT!
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Posting Guru
Joined: Nov 2003
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From: Near DC
Ease up, what's done is done.
Anything is possible given the space needed to accommodate.
Practicality is another issue.
Anything is possible given the space needed to accommodate.
Practicality is another issue.
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Well smart *** if that is the only option left, because i KNOW im not cool, i dont even try to be. There is just so much R&D and custom stuff, aside from electronics to control it, that to make one unit on 8 cylinders on a Vee shaped engine, it would cost well over $100,000 in parts, labor, computer machining and electronics just to get it. Then there's the space issue, stuff is tight at the rear on both sides, couldnt be more than an inch or so taller than stock, you'd need to fabricate new valve covers you could still get ON the heads in the truck, the injector armature would get in the way BIG time, etc. You would also need access to a foundry and very extensive machine shop... Ive examined the Jacobs brake on the Series 60 detroit engines, and the valve cover is a good 6-8" tall, a good 4" taller than normal if the engine didnt have the system. Thats fine under a HUGE hood where there is plenty of room. Did you post just to point out the fact im a smart ***, or did you have something useful to add?
Postmaster
Joined: Sep 2004
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From: Bellingham, WA
I always thought the idea of a jake was pretty cool, but Kris is right, its not really feasible for us. There's always the decel/EBV option though....Just suggesting something to help here guys...
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Joined: Dec 2003
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From: iowa
A "jake" brake actually opens the exhaust valve at TDC on the compression stroke dumping the compression, which forces the engine to do the work of compressing the air without the benifit of the power produced by the firing of the fuel. This method of an engine brake is first, not really feasible with a pushrod style of engine, and secondly Navistar actually put out a request that it NOT be done on the T444e engine do to problems it would cause so the companies that develop them stayed away from this engine. I would have to search for it but there was a link I think on here about that navistar deal about not putting a "jake" style system on these engines.
The exhaust brakes like using the EBPV is a different issue though.
here is a link to jacobs that explains the heavy truck version that everyone is familar with. Take a look at how it is setup and you will see why it's not really a feasible system on the 73, it's pretty obvious when you see them.
http://www.jakebrake.com/products/hd-engine.php
http://www.jakebrake.com/products/ho...rake-works.php
The exhaust brakes like using the EBPV is a different issue though.
here is a link to jacobs that explains the heavy truck version that everyone is familar with. Take a look at how it is setup and you will see why it's not really a feasible system on the 73, it's pretty obvious when you see them.
http://www.jakebrake.com/products/hd-engine.php
http://www.jakebrake.com/products/ho...rake-works.php
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Senior User
Joined: Feb 2007
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From: Duluth
Ahhh Thank You,
rather than being called a smart *** by someone, we see there is a reason for not doing this, yes it probably is overkill to do the jake brake, but we havt OT threads, crazy engines, the dual quad supercharged diesels, injecting anything and everything into our motors till they spontaneously dissasemble themselves and wonder "hmm why did that happen?" anyways, temper temper have some fun cause that what its all about. I like to challenge myself to think of things to do and this was nothing but a thought.
thanks to the moderator for shoing me some facts rather than just berating me
thanks to the moderator for shoing me some facts rather than just berating me