Does the new motor also inject fuel on the exaust stroke like the previous? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 18 (permalink) Old 10-28-2009, 07:15 PM Thread Starter
 
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Does the new motor also inject fuel on the exaust stroke like the previous?

6.7 Does it? and do they still have a dpf
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post #2 of 18 (permalink) Old 10-28-2009, 08:05 PM
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by the sounds of it yes they will use the late injection cycle and yes to the DPF

2008 F-350 Lariet 6.4L 170,000 km spartan tuned 275 daily
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post #3 of 18 (permalink) Old 10-28-2009, 09:22 PM
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YES X2
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post #4 of 18 (permalink) Old 10-28-2009, 09:34 PM
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will someone educate me on the later injection cycle thing? this is the first time iv heard of it.

mine: 1986 F250 6.9 idi

dads: 2001 F250 platinum edition 7.3 powerstroke

also 1966 MACK B53.in the process of restoring.

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post #5 of 18 (permalink) Old 10-28-2009, 10:40 PM
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Its a mechanism employed for the 2008 particulate emission requirements. In effect there is a large filter to catch the soot, as it fills up (which is does fairly quickly) the pressure gradient across the filter increases, prompting the system to go into an active regeneration -- which is the process by which the soot is burned down as far as it can into an ash. In order to accomplish this, exhaust temps have to increase significantly. This happens through the injection of unburned diesel fuel into the exhaust system at some point; unfortunately, the big three apparently all use in cylinder dosing -- the injection of unburned diesel fuel into the cylinder after combustion has occurred. The result of this is fuel dilution of the engine oil and, most likely, diminished engine longevity.

This seemingly does not absolutely have to occur in this fashion; a separate injector can be placed downstream and directly inject diesel fuel into the exhaust avoiding the problem of fuel dilution, but for some reason they choose not to utilize this strategy.

The cynic in me believes that the real logic behind this is that it decreases the longevity, decreases the expected life cycle, and increases the maintenance traffic and costs (after typical warranty life, of course)....
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post #6 of 18 (permalink) Old 10-28-2009, 11:27 PM
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oh. thanks man.

mine: 1986 F250 6.9 idi

dads: 2001 F250 platinum edition 7.3 powerstroke

also 1966 MACK B53.in the process of restoring.

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singles club # 218

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post #7 of 18 (permalink) Old 10-29-2009, 12:02 AM Thread Starter
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Looks like ill keeping the 6.0, I just dont like this design
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post #8 of 18 (permalink) Old 10-29-2009, 12:41 AM
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Quote:
Originally Posted by 350 powervalve View Post
Looks like ill keeping the 6.0, I just dont like this design
You can just remove it..... A few of us have had them "fall off"..... they actutally run pretty darn good once that happens!!!

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post #9 of 18 (permalink) Old 10-29-2009, 12:47 AM
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The 6.7L looks like it will have a whole lot more equipment to make "fall off." That much more work to reinstall for dealership visits too, I'd think.
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post #10 of 18 (permalink) Old 10-29-2009, 11:54 AM
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yea but thats what its coming to these days if you want a new diesel truck.

mine: 1986 F250 6.9 idi

dads: 2001 F250 platinum edition 7.3 powerstroke

also 1966 MACK B53.in the process of restoring.

american club # 31

singles club # 218

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