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Why did the engine manufacturers choose SCR?

April 26, 2017engine manufacturers SCR

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Why did the engine manufacturers choose SCR?

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Optimizing engine performance favors the production of higher levels of NOx. SCR, in turn, reduces NOx after it exits the engine, which allows the engine to run better, stay cooler and last longer. Manufacturers using SCR are able to optimize engine performance, with increased hp ratings and 3%-5% better fuel economy. I have heard of another engine manufacturer that will not use SCR.