Experience with new SCR engines?

Discussion in 'Trucks [ Eighteen Wheelers ]' started by Oram, Sep 8, 2012.

  1. dpfndefbad

    dpfndefbad Bobtail Member

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    Let me know when he figures out which bridge abutment hes gonna run into so i can park my truck in front of it
     
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  3. carrkool

    carrkool Heavy Load Member

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    the scr systems are not up to par yet. they are a fire hazzard and alor of insurance companies wont insure a truck with an scr system. the burn of camburg runs at about 2500 degress F. So hot in fact i drove on and my ice cold drink on the floor got hot as coffe in less than 100 miles. nice for winter though...lol
     
  4. JohnP3

    JohnP3 Road Train Member

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    I use to re power trucks, and we in Canada were not alowed to install an engine in a truck of an older EPA date, we could and did put in Newer ones. I have assembled Gliders, the truck is licenced as a new unit and unless they have changed the rules must have a compliant engine in it.
    With the tecnoligy out there, and states looking for money all they need it a pollution reading tower, two towers with infered lights between them they read the pollution output as you drive by top stacks, anywhere your exhaust is. The read you licence plate, they know how it is licenced, They can stop you right away or catch you at the next scale. How about demanding the truck is fixed to the proper spec, in their state. All things are posible and you are more than likely not from their state and it puts business and tax revenue into their state.
     
  5. durallymax

    durallymax Medium Load Member

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    Your post as well as others further illustrates that the issue is not the system. It is the manufacturer. Made in America is fine for a simple thing such as a wrench. But when it comes to new technology, it means problems.

    VGT's are on everything. A clean running engine will not have VGT issues. That is why DPF only engines had so many issues. They didn't run clean. They ran very dirty to keep NOX low without adding SCR. That causes issues everywhere.

    Engines based around SCR run cleaner internally. This reduces issues.

    The DPF should be plugging much less. This is the case on many vehicles now running both DPF and SCR.

    Your username reflects your arrogance and position on the topic and your post illustrates your truck stop talk knowledge.

    The DPF is not cleaned simply by injecting fuel. It is cleaned by heat activating the catalyst in this case platinum. If you are out working the truck Hard it will passively clean the filter as its working. The issue with big trucks is that there are too many people spec'ing too big of an engine for whatever personal issue they have. In addition to that many engines still don't get worked hard enough. Add in the idle time and the chances to passively cleanse the filter are reduced. The worst part is that when the engine is running cool it's also producing more soot that when being worked and also running less efficient to boot. This plugs the filter even faster.

    When restriction becomes too high an active regen is required. This is when fuel is in injected to create enough heat to cleanse the filter. Some vehicles require the operator to acknowledge the process for it to start others allow it to be post poned. This is where some issues arise. Operators ignore the regen and cause more problems for themselves then blame it on the stupid system the EPA made them use. Typical to blame someone else though, no different than anything.

    Then there is off the truck cleaning. This is needed when the filter becomes full. This must be done when required or the filter can be ruined.

    So if the filter cleans itself why does it need to be cleaned? simple. The Regen process essentially reduces the space that the particles trapped in the filter take up. Basically there's extra stuff that they hold onto and the Regen process downsizes and cleans the soot so that only the harmful things are kept in the filter. Eventually though they become full and need a machine cleaning.

    The replacement of the filter itself is usually related to operator error/arrogance/ignorance and/or other component failures/malfunctions.

    Particulate filters and SCR are far from being new tech. It's simply the fact that the diesel industry in America is in its learning stage and working as fast as they can to supply better quality a d better control.

    Within a few years they should have it dialed in much better.


    The SCR system is not this super complex system you describe. Its nothing more than one or two NOX sensors, an injector , a dosing module and a tank. It simply senses the NOX output and injects DEF as needed to control the NOX. What kill the sensors and injectors is again, operator and/or component failure upstream or downstream. If your engine starts burning a ton of oil, your emissions system front to back is going to cause a ton of issues.


    Don't hate the game hate the players.

    Computers will always have glitches. Remember the blue screen on Microsoft? Look how far they've come since those days.

    The de rating is the law. I do not know about commercial trucks but Most other vehicles require a vehicle restart for de rating to take effect unless it is in the interest of protecting from further component failure.

    On passenger vehicles they derate speed to 55mph. If you continually ignore it they drate to 4mph. Off road equipment derates 60% power.

    Again. The derate is setup so that the operator has adequate time to get the machine fixed. Adequate time means the very next dealer you pass. Not 2 weeks down the road. If you continually ignore it, you'll be de rated some and the. deal rated to the point of needing a tow.


    while yes I will agree that the systems have bugs to work out right now, I will also say that plenty of the complaints are "hear say" or the operator caused the issue in the first place whether they knew it or not.
     
  6. durallymax

    durallymax Medium Load Member

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    Wow.

    You clearly are off your barstool. SCR has nothing to do with running hot. That is the DPF. It can be a fire hazard with the wrong operator. So can a fuel leak or any other number of things.

    The internal temps of the DPF do not get anywhere near 2500* and the tip temps are very low. Why do you think the new SCR trucks have gone away from the big cooled tips?

    Your trucks insurance will be fine.

    Sent from my SCH-R530U using Tapatalk 2
     
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  7. DrtyDiesel

    DrtyDiesel Road Train Member

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    Exactly



    Ethan
     
  8. dpfndefbad

    dpfndefbad Bobtail Member

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    vegdurallymax. You said it you don't know about commercial vehicles. You ignorance about the discussion on a commercial truck forum is bordering on comical. I can only assume you work for a company who manufactures one of the faulty products in an scr commercial vehicle or the vehicle itself. In cummins passive scr systems automatic regeneration happens automatically as you stated. When the condition warrants a manual regen a light comes on and you pull over and depress the regen initiation button and nap for 30 minutes to a hour. This burns excess soot off with fuel so I am at a loss how it really reduces emissions as you are burning fuel and expelling co and co2 without putting any of this energy to use moving the vehicle. You say that scr is cleaner than dpf. You are wrong. The only readily available def fluid is sold at gas stations and truck stops in 2.5 gallon jugs. This creates a huge carbon footprint. Def manufacturing plants, plastic materials, transportation of raw goods to factory, transportation of finished product to warehouses and retail locations, and manufacture and transportation of all consumable products associated with scr systems equals lots of emissions. So in the end is it really cleaner? Also you say my experience is related to user error. I assume your thinking I would drive and drive with a regen light shining in my. T eyes. Three times my truck has derated. Each time the truck deratedwithin 20 miles of check engine light coming on
     
  9. DrtyDiesel

    DrtyDiesel Road Train Member

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    Def is available in bulk also.

    Plus def takes nox and the crap the dpf doesn't catch and cleans it. It is cleaner, but don't get me wrong, I not really for the whole emissions junk on engines.

    Ethan
     
  10. dpfndefbad

    dpfndefbad Bobtail Member

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    At no time did the regen required light come on. Nox sensor was the culprit at 30k miles. The other two times the unknown fault code fairy came to visit me. To clarify that is when the engine derated and had to be towed once and have a field service call by cummins the other. Both times the factory trained cummins tech with his insite equipped laptop forced a regen with no known cause of the derate. If this is a bug then what would you call a catastrophic failure? I have lost $10,000.00 in lost revenue because of faulty technology. These companies are billion dollar companies that have had years to perfect these systems. They have not. They send them to market after they get a prototype that performs under perfect conditions. The systems cost more to own and operate. They are less efficient than previous non scr engines. In my truck stop talk they are junk you moron.
     
  11. DrtyDiesel

    DrtyDiesel Road Train Member

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    Okay?..

    Was there are statement or question in this?

    Ethan
     
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