Posted by Brendon-KS on June 15, 2016 at 11:14:42 from (63.245.191.58):
In Reply to: Tier Four Trucks posted by showcrop on June 15, 2016 at 06:38:05:
Depending on the technology used for by the engine manufacturer going from Tier 3 to Tier 4 could actually increase the efficiency. The Tier 4 engines that utilize SCR/DOC are literally Tier 2 engines with exhaust aftertreatment added. These engines were stripped of the EGR systems which allowed them to run more efficiently but created more NOX. The SCR/DOC was then installed downstream of the engine to clean things up. My experience is with farm equipment but many over- the-road engines use the same technology so the principles are the same. We have many customers reporting a noticeable drop in fuel consumption with the new models compared to the older Tier 3 machines even though the power and capacity was increased. Of course, you do have the expense of another consumable (exhaust fluid) but this cost is small compared to what is saved by using less fuel. But, there is no denying the fact that the emission control systems are expensive and have added a lot to the selling price.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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