Case IH is touting its approach to meeting the tougher Tier 4b/Final emissions standards, which involves a selective-catalytic-converter only approach. The company has a range of patents on the system which has at its core a Fiat Power Train engine and proprietary tech to meet the newest emission standard. An examination of the diagram here will show that the engine has no changes and that the company met emissions standards through after-treatment only. It was considered a holy grail in the industry, but engine tech from corporate parent Fiat got the design conversation going. For farmers who have the Case IH Tier 4a standard engines - which use SCR - there will be a couple of differences to note in this design. First is that "exhaust flap" after the turbo. This closes down to keep exhaust pressures higher at idle, which is critical for making this system work. There is a need to keep the engine operating at a higher temperature for best results in a range of situations. You'll also notice the diesel oxidation catalyst - or DOC - in the exhaust line where the diesel exhaust fluid is injected into the system which starts the reaction to clean up the engine exhaust.
The company claims their solution delivers 95% NOx conversion efficiency versus 80 to 85% for competitive models. This engine requires no exhaust gas recirculation or a particulate filter to meet emission standards. This is a significant competitive advantage, according to Case IH. This engine technology will be found on a wide range of new machines for 2014 from the Puma to the Magnum to the Steiger to new combines (not all - read on to learn more), sprayers and windrowers.
Case IH notes that the exhaust flap and that DOC have lifetime service intervals - which means you don't need to service this portion of the engine at all, which enhances emissions efficiency and operation for the buyer.