Originally Posted by LandFakers
Spot on. Sure the air coming out of these motors is cleaner but I know for a fact that my brothers brand new 6.7 F350 drinks twice the fuel if not more than his old 7.3 F350. 18mpg with the 7.3, 8mpg with 6.7. Not sure how that is economical or good for the environment.
i've wondered the same thing. my 6.7 cummins is deleted, and i picked up around 4-5mpg by doing that, and probably tripled the life of my engine. soot is carbon, carbon is abrasive, and i surely don't want my engine breathing that. i liken it running an engine without an air filter.
on the 07.5-12 cummins, instead of DEF, they inject diesel into the cylinder on the exhaust stroke, effectively sending unburnt fuel into the exhaust and through the dpf. this is what cleaned the soot from the dpf. oh yeah, and whatever diesel happened to reach the cylinder liners washed the oil down and diluted your crankcase with diesel. thats gotta be healthy for an engine.
either way you slice it your burning more fuel. i cannot for the life of me figure out how burning more fuel can equate to fewer emissions.