To "delete" or not to "delete"

ShinerBock wrote:

DirtyOil wrote:


looks like you knew well enough, that a Catalytic converter on a "pre" DEF diesel engine was pretty much useless at reducing N0x.

The "catalytic converter" on a diesel that you are referring to is the "two way" or DOC(Diesel Oxidation Catalyst). The DOC is not and does not do the same function as the SCR(Selective Catalytic Reduction) system that requires DEF or the NAC(NOx Adsorption Catalyst) that removes NOx. The DOC's job is to reduce carbon monoxide and hydrocarbon emissions and are still being utilised on diesels today. So yes, the "catalyst" on the pre DEF engine was useless at reducing NOx since that was not it's job. It is the EGR (which you removed your in cylinder EGR) that has the job of reducing NOx by lowering combustion temps.

You are starting to sound like 6.6 Oilburner in making assumptions of how you think these systems operate.

I am only looking to learn something here.

I thought that the in cylinder egr (3rd injection event) actually raised in cylinder temps due to more fuel being burned. This is why EGTs on 04.5-07 is higher than engines without the 3rd injection event.

Is this incorrect?
Thanks

P.s. I am only referring to Cummins engines.