6.7L Power Stroke Engine and DrivetrainDiscussion of the 6.7L Power Stroke diesel engine and drivetrain in the 2011-Up Super Duty trucks. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.7L Power Stroke engine.
Does anyone know if the new 6.7 will use post-injection for the regen cycle as the current 6.4 does? I am hoping Ford will change gears and utilize the in-exhaust fuel injector instead. I am very interested in the new truck/engine, but I am not interested in worrying about oil dillution. That is one thing my 6.0 has going for it!
i have heard from the powerstroke sales guy they are using UREA injection if so another tank to fill with urea only time will tell close to release date
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The Bosch common-rail fuel system operates at up to 30,000 psi to send fuel to the engine’s 8 piezo injectors -- one per cylinder. Each injector nozzle has 8 holes and can deliver up to 5 injections per combustion cycle. Two pilot injections control noise levels, and a main injection is used for the power-generating combustion event. Two variable post injections are used to produce extra torque and for heating up emissions catalysts that scrub NOx and eliminate soot downstream from the engine. While cruising, only 3 or 4 injections will be needed.
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Greg & Jo Ann Surratt
Enjoying Champagne on the King Ranch
2006 King Ranch F-350 CC LB Dually Diesel 4x4
2007 Champagne Edition Nuwa HitchHiker
It does use post injection. It will also monitor for oil dilution and show a warning message in the message center when it gets excessive
...that's interesting.
While it may seem interesting at the outset, one would have to wonder what the programmed limits are.... Having a warning may give a warm and fuzzy feeling... knowing the trigger point might erase it.
They should have used the ninth injector post turbo as GM will do and then we could forget the oil dilution as long as the cylinder injectors don't screw up.
Bob
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08 F350 DRW 4x4 Lariat CC 6.4 torqshift wide track front axle 4.10LS
07 Montego Bay 34RLB3 5th wheel
(traded the 04 w/ 56K mi. on 3/25/06; the 06 w/ 45K on 10/1/07)
To the OP, the post injection you are referring to for the regen process has been eliminated. Instead they use an UREA solution injection to the catalyst, the UREA tank has a fill cap next to the fuel cap and capacity is expected to last 7500 miles. If you have your oil changed every 5000 miles, and filling UREA tank is standard, you should not have any problems. It will also be available at fuel stations, I have heard that when the UREA level is low (800 miles to E) a warning message will appear and once empty engine will run in derate mode.
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To the OP, the post injection you are referring to for the regen process has been eliminated. Instead they use an UREA solution injection to the catalyst,
Not true. The urea system will supplement the DPF system. The injectors are capable of 5 pulses per stroke, with up to two of the pulses being post-injection when needed for active regeneration of the DPF.
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Greg & Jo Ann Surratt
Enjoying Champagne on the King Ranch
2006 King Ranch F-350 CC LB Dually Diesel 4x4
2007 Champagne Edition Nuwa HitchHiker
Not true. The urea system will supplement the DPF system. The injectors are capable of 5 pulses per stroke, with up to two of the pulses being post-injection when needed for active regeneration of the DPF.
That's right. The DPF along with post injection will still be used to control opacity and particulate emissions. The UREA system will be used to control NOx.
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I know that some companies are going away from post injection with their new engines because of the problems with oil dilution. I believe volvo is one of them. They just inject fuel directly into the exhaust stream. Hopefully ford will come around or a aftermarket company will come out with a system like this.
Because Ford doesn't consider it a problem for us to have our oil diluted with 2.5% diesel fuel. That is the point of their short stick test on the dip stick oil check.
I like everything I read about the new Scorpion but since there is no ninth injector post turbo I'll keep my money till the brave ones report back on oil analysis up to 20,000 miles.
I'm sure Ford will still consider black tail pipes (cracked DPF's) normal too.
The good thing about the urea injection is that it allows less EGR and still meet emissions. Effective EGR requires retarding the timing which is counter productive to fuel efficiency. The urea is good route.
The DPF still has to be regenerated or cleaned so they still have to use fuel to get the DOC to create enough heat. The DPF is to trap soot. So if we have to have the DPF to control the soot I am okay with that but I'm not okay with my fuel being diluted. Adam Gryglak, chief design engineer for the engine says the combustion has been improved and it will not be a problem. Maybe true with the much shorter exhaust route and claimed improved exhaust flow with center V exhaust ports. If that unburned fuel gets atomized in the exhaust and flows right on out maybe it will not collect on the cylinder walls and end up in the oil. Myself, I'll hold off on truck purchase and wait and see what the experience is for the first time buyers.
GM will have the ninth injector on their 2011 Duramax.
Bob
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08 F350 DRW 4x4 Lariat CC 6.4 torqshift wide track front axle 4.10LS
07 Montego Bay 34RLB3 5th wheel
(traded the 04 w/ 56K mi. on 3/25/06; the 06 w/ 45K on 10/1/07)
i have heard from the powerstroke sales guy they are using UREA injection if so another tank to fill with urea only time will tell close to release date
The urea injection (along with the selective reduction catalyst - SRC) is to reduce the formation of oxides of nitrogen during periods of high combustion chamber temps... the truck is still going to rely heavily on the EGR valve. This system is quite complex and, since urea is caustic, there will be some "activity" after the truck is shut down.
The post injection that is being referred to is to assist in raising the temperature at the diesel particulate filter in order to "cook off" soot accumulation.
Wonder why Ford still wants to use post inj. with all the oil dilution problems?
At this point in time, I don't think it's a matter of "wanting" to... if there is a "better way", I imagine they might pay handsomely for the patent rights....
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