Posted by Mark Robke on March 12, 2016 at 11:10:13 from (98.19.79.182):
In Reply to: Propane comeback? posted by notjustair on March 11, 2016 at 20:58:01:
I just retired last year from working on trucks.I worked for a national leasing company in Cincinnati,but we were learning that on the west coast CNG(compressed natural gas) engines-Cummins and Detroit-were being used a lot;they were the next up and coming thing.They were mostly being used for local running/intracity applications.The main draw back is the lack of infrastructure for fueling,and facilities that were set up to allow repairs(special whole building ventilation),and also technician training.The reasons for using CNG,was emissions driven,and possibly fuel cost.As robgIN states,the current diesel emission controls do not work well with stop and go low speed driving,or even very cold weather:the exhaust system needs to stay hot for the particulate filter to work.We were having a hard time with particulate filters plugging on some of our units that ran city,and the system requires drivers to be proactive as a part of the emissions system,and not all of them were smart enough to be.The addition of DEF(diesel exhaust fluid) fluid made the systems more complex,and more problematic.The CNG engines have been used for a long time,but I believe mostly in stationary applications.I also believe that UPS is looking at them as well. As far as power,I cannot say,but these units are coming.I heard from major engine manufacturer's trainer,that they were looking into low rpm engines(1300 top rpm) for trucks with lower top speeds; all this is driven by federal emissions and economy standards.Mark
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