Regen Q
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Post Fiend
Joined: Jun 2003
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Regen Q
As I was driving home tonight I noticed the message pop up and recalled reading a thread describing the process. One thing I didn't see explained though was what lights off the raw fuel passed through the exhaust?
I mean I suppose it *could* get lit off at just the right moment in just the right place by the conditions there, but I got to thinking doesn't the exhaust continue to cool as is moves further in the exhaust stream? Also, I'm assuming that it does not get lit off during the exhaust stroke (or does it?) and passes through until it reaches the DPF, where it get's lit off and serves to reduce the built up carbon.
I mean I suppose it *could* get lit off at just the right moment in just the right place by the conditions there, but I got to thinking doesn't the exhaust continue to cool as is moves further in the exhaust stream? Also, I'm assuming that it does not get lit off during the exhaust stroke (or does it?) and passes through until it reaches the DPF, where it get's lit off and serves to reduce the built up carbon.
Lead Driver
Joined: Feb 2005
Posts: 7,928
Likes: 2,644
From: The Great State of Texas
I believe the fuel is burned in the hot cylinder when the exhaust valve is open. This elevated exhaust temperature is what actually burns the soot in the DPF and converts it into a gas.
Lead Driver
Joined: Nov 2005
Posts: 5,222
Likes: 4,232
From: Kaysville Utah
From the 6.7L Coffee Book
page 78
Diesel Oxidation Catalyst (DOC)
The DOC is a ceramic catalytic converter which oxidizes
hydrocarbons in the exhaust and generates heat for the SCR
and DPF to function properly
page 81
The PCM automatically activates the left bank fuel injectors only the exhaust stroke to raise exhaust temperature to begin regeneration while the vehicle is in motion
I frequently see my EGT1 at 700-800° during regen and EGT4 at 1200° So the exhaust gases get hotter as they pass thru the system during regen
page 78
Diesel Oxidation Catalyst (DOC)
The DOC is a ceramic catalytic converter which oxidizes
hydrocarbons in the exhaust and generates heat for the SCR
and DPF to function properly
page 81
The PCM automatically activates the left bank fuel injectors only the exhaust stroke to raise exhaust temperature to begin regeneration while the vehicle is in motion
I frequently see my EGT1 at 700-800° during regen and EGT4 at 1200° So the exhaust gases get hotter as they pass thru the system during regen
Posting Guru
Joined: Feb 2010
Posts: 1,411
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From: Opelika, AL
Same here....but also see the 1200's in #2 and #3.....its almost like it cycles the heat back and forth and burns them off in stages at different times within the 10minute regen?
New User
Joined: Jun 2012
Posts: 22
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edit: found the answer in another thread.
Posting Guru
Joined: Nov 2010
Posts: 1,406
Likes: 3
From: Altoona, Ia
Keep in mind those EGT readings are far downstream of the turbo and aren't of much value other than for regen purposes.
Far as the engine is concerned, pre-turbo are the only EGT readings you should monitor especially if you're using a tuner.
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New User
Joined: Jun 2012
Posts: 22
Likes: 0
That would need drilling, tapping, EGT probe of the manifold, and at least a monitor correct? Pre-Turbo is what I would like to monitor.
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