MP8

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.

Sorry to say it but EGR = guts ache. The US went to the wrong emission technology. You wont like me saying that, but its true. When US04 came in you should have jumped straight into SCR like Europe (Euro4). Here in Australia we have been running US04 & Euro4 since 2008, so we have had experience with both EGR and pure SCR (no EGR) for nearly 3 years. Have seen both technologies at work next to each other. EGR has a far higher guts ache factor - VGT / Coolers / Valves / Fan hubs - all the stuff you guys know about - trucks with 5 VGT turbos in 2 years, 3 coolers etc. SCR is inconvenient, but the engines are pre US04, so they last and are a lot more reliable. Either buy / use urea or you buy / use egr spare parts / downtime. In January 2011 we go to US07 / Euro 5 and Mack will offer a MP8 rated at 535hp with pure SCR (no EGR) & drop EGR all together. This motor will be million km + unit, like the D13 520hp SCR is today. A Mack MP8 EGR / Volvo D13A 500hp EGR is only half as reliable as the SCR version - true story. As far as Cummins goes, they are going to EGR / DPF next year here (US07) same as Detroit. Their engines are pretty unreliable now - so things cant get any better for them. We Aussies havent a time table for going to US10 yet - hopefully they will defer it as long as possible - anything to avoid EGR in 500 hp+ / 145,000lb +( 65 tonnes application) in our heat!