BigWrench55
Senior Member
Is the rise in efficiency the reason some OEM's are doing away with egr
I took a class at Cummins for teir4 final engines. By the time I got into class I had most of teir4 figured out, but I still learned something. One thing I learned is that Cummins is the first to come up with a teir4 emissions engine that would work. The other thing I learned is that most everyone has a licensed version of their system. And Bosch makes almost everyone's def components. The other thing that I learned was that. Once the def system was added and how it works, the need for egr wasn't necessary. I did raise the question as to why egr was still being used, but couldn't get a answer. It appears that since then the engineering gods have agreed. And now the next generation of emissions doesn't have it.
Also anything 50 horsepower and above has to have the latest emissions standards. the smaller engines will regen passively and not need def. The larger engines will regen passively and run def. Since the emissions game is expensive you will notice manufacturers for small platform equipment have a 49.5 horsepower engines.