Why no "intercooled" exhaust tip like GM and Ford - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 5 (permalink) Old 08-09-2007, 09:25 PM Thread Starter
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Why no "intercooled" exhaust tip like GM and Ford

GM and Ford both have "intercooled" exhaust tips, or more specifically, tips that draw in cool air so that the super high exhaust temps that are seen during regeneration don't start fires or burn peoples legs as they walk by. Why doesn't the new 6.7 have this? What is Dodge doing to cool these superheated gasses?
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post #2 of 5 (permalink) Old 08-10-2007, 03:10 PM
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i could be mistaken but i believe i read somewhere that the cummins does not create the heat that the 2 v8 models do.
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post #3 of 5 (permalink) Old 08-10-2007, 04:13 PM Thread Starter
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You would think that the same temp would have to be achieved by any engine in order to burn the soot that's trapped in the DPF and turn it into ash during regen. Not that I'm doubting you midnightcaper, just wondering. . . . .
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post #4 of 5 (permalink) Old 08-11-2007, 12:50 AM
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Might sound silly but Dodge is having an enormous issue with fully plugged DPF's and the other two (GM, Ford) aren't. Is it coincidence?? I don't know, I wonder if they ever looked into that. Far as I know it's just meant to cool the exhaust at regen to prevent burning things. Mine went into regen today and it was screaming hot about 2ft away, I'd hate to see what Dodges feel like. Then again, they don't regen at idle so maybe they feel the truck being in motion cools it down before hitting the body?
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post #5 of 5 (permalink) Old 08-12-2007, 08:05 AM
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Well, I dunno about ENORMOUS issues with the DPFs. I haven't seen any of these so called ENORMOUS issues at my dealer yet. I'm not having any ENORMOUS issues or any issues at all with the DPF for that matter. Personally I'd hate to feel the heat off a higher heat generating V8. Logic says it's gotta be more right? Going into regen at idle sitting in field could spell disaster. Guess I'd rather be in motion during regen.

Here's some info from Crazyhass84:
Passive regen uses the heat from the exhaust to burn off the soot in the DPF and make it ash. Active regen puts fuel into the exhaust which reacts with the precious metals (creating an exothermic reaction-generates heat) in the DPF which in turn burns the soot. So, you can run around town all you want with low EGTs but you will go into ACTIVE regen more often. Oh ya I should know because I am a CAT engine engineer!

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