Compression Ignition Addict
Join Date: May 2011
Location: Union City, PA
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DPF and Regeneration - Something to challenge you.
So, I have a couple questions and thoughts on the DPF and regeneration cycle. The way I understand the particulate side (not the DEF side - I understand it doses with urea and causes NOX to convert) is that the DPF collects soot and when the truck detects it's clogging, it injects fuel into the exhaust stroke to burn out the soot.
The injection of diesel on the exhaust stroke of the engine can cause dilution of oil, correct? And, on the 6.7, the diesel is injected during the exhaust stroke, correct?
So, my thought is this....what if you took the DPF and "gutted" it essentially. Kind of like leaving a catalytic converter in place, but hammering some holes though it to obtain flow? I realize this negates the intention of the DPF, but I assume it would also not trigger regeneration (and oil dilution and poorer fuel mileage). Has anyone looked at this, assuming my understanding is correct? I mean, in theory, the truck could look 100% stock (all sensors in place and operational - looks stock to the observer looking at the exhaust), but the inside of the DPF could be freer flowing. I believe pressure is what's triggering regens (pre DPF and post DPF differential pressure transducer)....or at least I know some vehicles use this b/c the company I work for makes differential pressure transducer assemblies for diesel vehicles.
Another way of looking at it....couldn't you take out the DPF and fabricate a flow through tube with the sensor ports in place and thus still have the truck computer stock and just never incur a regen?
To boil it down, assuming you could cut a hole through the inside of a DPF on the 6.7, would the truck still run properly (maybe even better with less backpressure) and just not regen and have better mileage (assuming all sensors in place and not harmed)?
Is anyone a mechanic on here who understands these trucks concerning this point?
Thanks in advance.