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SVTPerformance Fueling the Fire : Gas Vs. Diesel Debate
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<blockquote data-quote="SecondhandSnake" data-source="post: 11187061" data-attributes="member: 116684"><p>Whoops, I was thinking of the ISX 15/11.9 when I said SOHC. I've been buried in ISX 11.9 work lately so it's tough to get off my mind.</p><p></p><p>I agree that DVVT would be an incredible asset to emissions and power. However I don't see the EGR cooler going away anytime soon based on the EGR fraction required and heat rejection required. Of course this is unfortunate based on the fact it's a weak link and the added heat rejection required of the cooling package. It would be nice to toss EGR all together, but it does help fuel economy dramatically.</p><p></p><p>A next generation of fuel system is already in the works. What concerns me is the safety issues of such high pressures. A rupture in such a high pressure line could do some serious bodily harm. (Meanwhile us gas guys are still using venturi-based mixers.)</p><p></p><p>And I wouldn't put diesel emissions technology on par with gasoline. I'm in the natural gas side of things, and we're pretty much the same as gasoline aftertreatment. We have EGR and a catalyst, occasionally some CCV, that's it. Our 07 engine wasn't even changed to meet 2010 regulations, and don't expect to see much for 2013. Diesel on the other hand is a nightmare, particularly with the SCR/DEF systems. Note that the Cummins ISB doesn't need it, unlike the Powerstroke and Duramax. :rolling:</p><p></p><p>On the diesel side I only see much more sophisticated, complex, and expensive aftertreatment in the future. However you'll also see dramatically improved fuel economy and smaller commerical engines available.</p></blockquote><p></p>
[QUOTE="SecondhandSnake, post: 11187061, member: 116684"] Whoops, I was thinking of the ISX 15/11.9 when I said SOHC. I've been buried in ISX 11.9 work lately so it's tough to get off my mind. I agree that DVVT would be an incredible asset to emissions and power. However I don't see the EGR cooler going away anytime soon based on the EGR fraction required and heat rejection required. Of course this is unfortunate based on the fact it's a weak link and the added heat rejection required of the cooling package. It would be nice to toss EGR all together, but it does help fuel economy dramatically. A next generation of fuel system is already in the works. What concerns me is the safety issues of such high pressures. A rupture in such a high pressure line could do some serious bodily harm. (Meanwhile us gas guys are still using venturi-based mixers.) And I wouldn't put diesel emissions technology on par with gasoline. I'm in the natural gas side of things, and we're pretty much the same as gasoline aftertreatment. We have EGR and a catalyst, occasionally some CCV, that's it. Our 07 engine wasn't even changed to meet 2010 regulations, and don't expect to see much for 2013. Diesel on the other hand is a nightmare, particularly with the SCR/DEF systems. Note that the Cummins ISB doesn't need it, unlike the Powerstroke and Duramax. :rolling: On the diesel side I only see much more sophisticated, complex, and expensive aftertreatment in the future. However you'll also see dramatically improved fuel economy and smaller commerical engines available. [/QUOTE]
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