a friend of my dads use to drive big trucks, he was looking in my truck an asked me if mine had the exhaust brake i said yeah. well he told me make sure i do not use it cause it is very bad on the motor. he said alot of trucking company don't allow you to use them because they damage the engines. whats yall knowledge on this subject i can't find anything about it on the internet.
six pack
09-24-2007, 10:00 PM
Use it and enjoy it! Do you really think Cummins would install it if it hurt the engine?
cumminsdude
09-24-2007, 10:53 PM
I drove truck for 2.5 yrs and that's the first if heard of that. Dodge and cummins would not offer it as a option on the 5.9 if that were the case, and it's offered on the 6.7 as a turbo brake I use mine all the time when the truck is turned on so is the turbo brake.
co416r
09-24-2007, 10:56 PM
About 98% of big rigs have them. I drove big rigs for 12 yrs. and I wouldn't want a truck that didn't have it. I never heard of it hurting the engine. Definitely saves on the brakes.
Ram3500Dually
09-25-2007, 11:28 AM
a friend of my dads use to drive big trucks, he was looking in my truck an asked me if mine had the exhaust brake i said yeah. well he told me make sure i do not use it cause it is very bad on the motor. he said alot of trucking company don't allow you to use them because they damage the engines. whats yall knowledge on this subject i can't find anything about it on the internet.
Maybe thats why he "used to" drive big trucks, LOL. What he has told you is false. I drove truck for over 30 years and never heard that one.
RAJ
09-25-2007, 11:59 AM
big rigs dont use exhaust brakes, they have jakes, jakes are in the motor slowing down the cam (i believe its on top of the lifters not sure tho)
cockdiesel
09-25-2007, 01:09 PM
I think your friends dad is referring to an engine retarder. The exhaust brake is different. The only thing I've heard is that big trucks shouldn't use the engine retarder (Jake brake) when they are empty because it hurts the engine. I don't know why but I'm sure someone else could explain it to us. Like was said, Cummins put it on the truck as standard equipment so use it. I know someone is going to say "they also put the DPF and emissions stuff on there too!"Ha!Ha! :D
Ram3500Dually
09-25-2007, 02:47 PM
big rigs dont use exhaust brakes, they have jakes, jakes are in the motor slowing down the cam (i believe its on top of the lifters not sure tho)
Big rigs have both. There are a couple of differents kinds of exhaust brakes. There is no "Jake" brake persay. A "Jake Brake" is shortform for a Jacob's Braking system. It is done thru the heads I believe.
cumminsdude
09-25-2007, 06:21 PM
I think your friends dad is referring to an engine retarder. The exhaust brake is different. The only thing I've heard is that big trucks shouldn't use the engine retarder (Jake brake) when they are empty because it hurts the engine. I don't know why but I'm sure someone else could explain it to us. Like was said, Cummins put it on the truck as standard equipment so use it. I know someone is going to say "they also put the DPF and emissions stuff on there too!"Ha!Ha! :D
Ok you kind of right being empty or bobtailing (means without a trailer) does not hurt the engine when you are using the engine brake Or refered to as jakes there are 3 stages to a engine brake 2 cyl, 4 and, 6cyl and 6cyl being the strongest. the only time the jakes are Hard on the engine, is when you here a guy "jake shifting" this is a driver who uses the jakes to slow the engine speed to gab the next gear, don't need to use the clutch because the tranny's are non syncronized. And most importantly if the engine RPM are high enough like 1800 to 2000rpm and engauge the jakes there is a chance of dropping a valve in the engine, very rare but it has happened.
Ram3500 i'm not being smart or nothing but i thought you retired from DC?
porkchop2245
09-25-2007, 06:23 PM
im 25 yrs old i have been around trucks all my life and it does not damage the engine use it and enjoy it and dont belive him cause as a owner and a driver we all wont steer you wrong on this site
cumminsdude
09-25-2007, 06:26 PM
Oh wait now, I think you hauled parts for DC between the manufacturer to the assembly plants I probably met you on the 401 somewhere once upon a time. LOL
cumminsdude
09-25-2007, 06:28 PM
im 25 yrs old i have been around trucks all my life and it does not damage the engine use it and enjoy it and dont belive him cause as a owner and a driver we all wont steer you wrong on this site
I have been around trucks all my life, I drove and now i'm a mechanic so i'll believe what cummins and cat tell me.
porkchop2245
09-25-2007, 06:41 PM
well i can say this much only time the jack was off was during up shifting cause it can hurt then other then that i have never had no problems we had three tractor each with a major brand motor and never had a problem with any of the jake brakes. i to have worked on them and even rebuilt or last truck so i do know a little when i dont i ask and i will offer my advice its his choice if he wants to take it. Six Pack and Ram3500 are very knowledgeable on then new truck and i will take there word as fact they have not steered me wrong yet
cumminsdude
09-25-2007, 08:37 PM
the turbo brake is on on my truck all the time, I think we go of the topic a bit, I hardly ever touch the brakes I let the engine and tranny slow me down.
porkchop2245
09-25-2007, 08:55 PM
it is also on in my truck all the time also it speed up warm up and does provide less wear and tear on the braking system
pyrokid
09-26-2007, 06:36 AM
a friend of my dads use to drive big trucks, he was looking in my truck an asked me if mine had the exhaust brake i said yeah. well he told me make sure i do not use it cause it is very bad on the motor. he said alot of trucking company don't allow you to use them because they damage the engines. whats yall knowledge on this subject i can't find anything about it on the internet.
Well first tell him that he should do more research. Sounds like he is just repeating what some job blow told him. Jake do not hurt the engine at all. Also, Big Rig manufacturers are switching to an exhaust brake instead of the current active system because there are less moving parts, and easier for repairs. Just my two cents!
Ram3500Dually
09-26-2007, 09:01 AM
Ram3500 i'm not being smart or nothing but i thought you retired from DC?
I retired from Daimler Chrysler Transport. The last 10 years I spent hauling sheet metal from a stamping plant in Windsor down to Brampton Assembly, home of the 300, Magnum and Charger.
Here are pictures taken on my last day on the job.
cumminsdude
09-26-2007, 06:59 PM
I retired from Daimler Chrysler Transport. The last 10 years I spent hauling sheet metal from a stamping plant in Windsor down to Brampton Assembly, home of the 300, Magnum and Charger.
Here are pictures taken on my last day on the job.
Post #11
Oh wait now, I think you hauled parts for DC between the manufacturer to the assembly plants I probably met you on the 401 somewhere once upon a time. LOL
I thought of this right after I asked you the question about you retiring, I seen those DC trucks all the time when I was trucking, I kind of miss driving truck than I think of the new LogBook laws and the politicians poking there nose where it does not belong looking for votes ie SPEED LIMITERS on owner/op trucks. To tell you the truth the sound of the 6.7l "gearing down" on my very first test drive prompted me to trade up, I always wanted a CTD anyway.
cumminsdude
09-26-2007, 07:01 PM
Ram3500 I see you last truck had the "benz" diesel in it I never had the pleasure to try one how did you like it? Pull nice?
Ram3500Dually
09-26-2007, 07:25 PM
The 2002's were our first Benz trucks. They pulled the equivalent of the Cummins. What I really liked about the Benz engines was the exhaust brake. We never had them on the Cummins.
I used to leave Windsor at 10 pm and get back about 6 am. The last year I drove I started at 7 PM and finished about 3 AM
cumminsdude
09-26-2007, 07:44 PM
What did you like about the exhaust brake on the "benz" compared to the "Jacobs"
Ram3500Dually
09-26-2007, 07:53 PM
We never had ANY brake on the Cummins trucks. The Benz had the two step brakes, high and low.
RamLWB4x4
09-26-2007, 09:11 PM
Got a question about the exhaust brake on my new 6.7, why do I hear the turbo spooling up when the EB is working? (I am still reading the owners manual, if it is in there, I haven't got to it yet.)
lvramcummins
09-26-2007, 10:35 PM
yes, that is what it sounds like
cumminsdude
09-27-2007, 01:20 PM
Got a question about the exhaust brake on my new 6.7, why do I hear the turbo spooling up when the EB is working? (I am still reading the owners manual, if it is in there, I haven't got to it yet.)
I'm going to take a stab at this question and someone can correct my if i'm wrong the theory behind the exhaust brake is to restrict the exhaust, making the pistons work harder, slowing the crankshaft and the truck, by making the pistons work harder the exhaust pressure inside the cylinders increases and the exhaust velocity increases as well, even though the exhaust brake is on but not completly choking off the exhaust the high velocity exhaust gas still escapes and starts to spool the turbo, keeping in mind the turbo is still compressing intake air into the cylinders and also being exhausted that is why the longer you have you exhaust brake engauged the faster the faster the turbo spools up.
The same principle applies to the semi trucks using a engine brake, but keeps the exhaust valves closed on the compression stroke just until the piston reaches top dead center and than the exhaust is opened creating that rappy sound in the exhaust, and this is all timed upon the firing order of the engine.
I hope this helps
birds1969
01-09-2010, 08:36 AM
a friend of my dads use to drive big trucks, he was looking in my truck an asked me if mine had the exhaust brake i said yeah. well he told me make sure i do not use it cause it is very bad on the motor. he said alot of trucking company don't allow you to use them because they damage the engines. whats yall knowledge on this subject i can't find anything about it on the internet.
I am woundering the same thing as well. I just purchased my 6.7 and I am not very smart with the whole diesel seen since this is my first one that I have owned myself. We do have a Cummins Rollback at work with a exhaust break on it and it made the head gasket go bad do to the pressure that is built up when running the EB? Didnt know for sure if the setup on the dodge cummins is the same so am very skeptical about running my EB all the time since this happened to the Rollback at work. I guess Id like a clear explanition on how exactly the EB works on the 6.7
CDP6.7
01-09-2010, 12:21 PM
I am woundering the same thing as well. I just purchased my 6.7 and I am not very smart with the whole diesel seen since this is my first one that I have owned myself. We do have a Cummins Rollback at work with a exhaust break on it and it made the head gasket go bad do to the pressure that is built up when running the EB? Didnt know for sure if the setup on the dodge cummins is the same so am very skeptical about running my EB all the time since this happened to the Rollback at work. I guess Id like a clear explanition on how exactly the EB works on the 6.7
I've never seen a HG blow because of somebody using the exhaust brake. And I've seen some guys use it 24/7 towing for over 200,000 miles.
The exhaust brake ONLY comes on when the throttle is at 0%, thus, you aren't building boost. I can tell you from looking at my boost gauge, my boost is at 0 when the exhaust brake kicks on.
What blows HG on 6.7's is one of two things - a tuner using too much timing, thus causing increased cylinder pressure, thus popping HG's. Or stacking programmers that both use timing.
6.7's make tons of torque, have a very restrictive VGT turbo, which when combined, cause crazy drive pressure #'s. Ideally, you want a 1:1 ratio for boost to drive pressure. Meaning, if you're making 30lbs of boost, your drive pressure should be 30lbs as well.
It's not a stock 6.7. 30lbs of boost = 60lbs of drive pressure. Why? Going back to the fact the stock turbo sucks for airflow. If your truck is stock, you really won't see any issues with this. But if you start running a programmer, you will. I've seen some people have 120lbs of drive pressure on the exhaust side. That'll pop a HG.
If you don't want to pop the HG, just buy an external wastegate kit. Glacier Diesel Performance and Rollinsmoke Diesel offer kits, ranging from $499-$650. They will require you delete the EGR cooler.
Ram3500Dually
01-09-2010, 01:01 PM
I've run my EB all the time for 65K now and not a hint of a problem. I'm sure that and the EGR unplugged is one of the main reasons my truck has been absolutely problem free.
