Urea is fertilizer 44% Nitrogen we have had tractors with SCR for 2 years now no problems with the system, and its quite a bit easier on fuel than the exact same motor with a EGR DEF is easily found, all else fails go to AGCO, MF, or Case IH the 2011 Powerstroke and DMax use the stuff too, so its going to as common as windshield washing fluid here pretty soon only down side I see is higher fertilizer prices coming down the pipe
We have been using SCR & EGR D13 in Australia since 2008 (when we went to US04 emissions) in Volvo product and just EGR with Mack MP8. Next year we go to US07 & Mack will drop EGR all together in Australia - bar Cummins 15 litre. The MP8 will be a pure SCR engine (no EGR) rated at 535hp. There are prototype Titans runnig now with MP10 SCR at 700hp - the test units may be even screwed out a bit more than that - probably will be released in 2012. The US should have never gone to EGR until US10, and just used SCR until then. US04/07 SCR engines are basically well tuned pre US04 spec - nice clean efficient fuel burn / no soot and the NOx gets wiped out in the exhaust pipe. I am guessing you could have got a E7 to meet US04 & probably 07 if you went to SCR not EGR. Our expereince over here is SCR D13 @ 520hp is heaps more reliable than a MP8/D13 EGR at 500hp. All the bolt on crap goes wrong - coolers, VGTs, fan hubs, injector tubes, sensors etc. Whereas with a SCR motor - no VGT, no coolers, no bigger fan / radiator - just a tank, small pump, injector & 2 sensors in the exhaust = less can go wrong. BUying / filling up with urea is a real inconvenience. But it is less inconvenient than having your truck break down all the time. Most owners have 1000 litre tanks in their yard.
Macks New Egr System
in Modern Mack Truck General Discussion
Posted
We have been using SCR & EGR D13 in Australia since 2008 (when we went to US04 emissions) in Volvo product and just EGR with Mack MP8. Next year we go to US07 & Mack will drop EGR all together in Australia - bar Cummins 15 litre. The MP8 will be a pure SCR engine (no EGR) rated at 535hp. There are prototype Titans runnig now with MP10 SCR at 700hp - the test units may be even screwed out a bit more than that - probably will be released in 2012. The US should have never gone to EGR until US10, and just used SCR until then. US04/07 SCR engines are basically well tuned pre US04 spec - nice clean efficient fuel burn / no soot and the NOx gets wiped out in the exhaust pipe. I am guessing you could have got a E7 to meet US04 & probably 07 if you went to SCR not EGR. Our expereince over here is SCR D13 @ 520hp is heaps more reliable than a MP8/D13 EGR at 500hp. All the bolt on crap goes wrong - coolers, VGTs, fan hubs, injector tubes, sensors etc. Whereas with a SCR motor - no VGT, no coolers, no bigger fan / radiator - just a tank, small pump, injector & 2 sensors in the exhaust = less can go wrong. BUying / filling up with urea is a real inconvenience. But it is less inconvenient than having your truck break down all the time. Most owners have 1000 litre tanks in their yard.