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#1
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The sweet smell of ULSD
The other week I had to yank my sons 1999 turbodiesel out of the snow so I used a tow rope attached to the rear of my 07 ML CDI.
As I was down on my knees attaching the rope I had my face right on the tailpape. I was really surprised how undiesel like the exhaust smell really was. It was almost a sweet smell. I guess going from 500 ppm down to 15 ppm sulfer really cleaned thing up. Wonder if the commen rail direct injection techniques help clean up the combustion too? |
#2
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The short answer is "yes". The reason for common rail is better control over the injection event thru electronics and, of course, finer atomization. Common rail allows control over injection amount, timing, and pretty much all other injection variables as a response to feedback from the various sensors - not readily possible with mechanical injection. The computer also monitors and controls intake manifold pressure (boost), transmission shift points (with auto trans), EGR function, and pretty much everything else in the car. The aftertreatment system is there to just sort of clean up what's left.
Almost forgot - the ULSD is just required to keep the aftertreatment system alive. Sulfur will contaminate an aftertreatment system like lead will contaminate a catalyst on a gasoline-fueled engine. The improved exhaust aroma is just a side benefit, though a nice one. Dan |
#3
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Does your CDI have one of the new particulate filters on it? It probably does which is why it smells sweet and so un-diesel like. All the new fords are the same way.
__________________
2004 F150 4.6L -My Daily 2007 Volvo XC70 -Wife's Daily 1998 Ford F150 -Rear ended 1989 J-spec 420SEL -passed onto its new keeper 1982 BMW 733i -fixed and traded for the 420SEL 2003 Volvo V70 5 Speed -scrapped 1997 E290 Turbo Diesel Wagon -traded for above 1992 BMW 525i -traded in 1990 Silver 300TE -hated the M103 1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one 1979 Silver 300D "The Silver Slug" -Sold |
#4
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Yes the CDI has the particulate filters. I guess all those factors add up to cleaner and more efficient engine operation
I recall back in the day the old oil burner diesels trailing a tail of black sooty smoke under heavy acceleration. Is the " Italian Tune-up" unnecessary any more with the CDI's ? |
#5
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dude99 is correct, it's the after treatment giving you the smell, not the ULSD. My '03 common rail Dodge with no emission controls still has the typical smell on ULSD.
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'83 300D, 126K miles. |
#6
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Agreed. It's the cat.
My 87 smells like old school. My 98 and 08s have that odd smell. At first I thought I had a bad batch of fuel until I started smelling other new Diesel vehicles and realizing that's how they all smell when they have post treatment.
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The OM 642/722.9 powered family Still going strong 2014 ML350 Bluetec (wife's DD) 2013 E350 Bluetec (my DD) both my kids cars went to junkyard in 2023 2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles) 2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles) 1998 E300DT sold to TimFreeh 1987 300TD sold to vstech |
#7
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The urea after treatment systems smell better than the DPF VW ones that do a burnoff regen, when those are doing the regen cycle they smell awful.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#8
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From what I have smelled from these newer Diesels is a Chlorine or Clorox smell. Like breathing poison.
And the city busses burning natural gas. yuk. Charlie
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there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works |
#9
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Yes it is very much like chlorine gas. The gases created by the DPF actually ARE toxic and poisonous, so there's an ADDITIONAL catalyst to further treat it and make it non-dangerous if breathed by accident.
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-diesel is not just a fuel, its a way of life- '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k) |
#10
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everyone just run high % biodiesel so the world can smell like french fries and popcorn thank youuuu
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1981 NA 300D 310k miles |
#11
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Quote:
You should get your nasal passages checked.
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CENSORED due to not family friendly words |
#12
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One thing I've always taken note of is the unique smells of different engines. My Benz's, my old Powerstrokes, the different Cummins (we have 5.9 common rails and 6.7's at my work), and the Duramax. They all smell a bit different, with the biggest changes being in correlation to the technology they use.
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1981 300SD - 283,000 KM's at purchase, 360k+ now. Engine replaced at 311k. 16" CLK wheels, w126 gen II cosmetic upgrades, late w126 leather interior. RIP. Parted and gone due to fire 1987 300SDL - 243K miles and counting. In winter hibernation! 2001 Ford F250 Super Duty "Platinum Edition" Lariat 4x4 7.3L turbo diesel, 295k+ miles, various mods for reliability and performance. |
#13
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Agree, they smell like bleach or chlorine. I have experienced this several times being behind my wife's 2013 Passat TDI. No issue unles she accelerates hard, then you smell a faint chlorine smell....
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2012 Mercedes ML350 Bluetec 91K (hers) 2005 Corvette 55K (fun car) 2002 VW Jetta TDI 231K (mine) 1998 Volvo S70 T5 Turbo 196K (kids) 1994 Ford F150 4WD 249K (firewood hauler) 1983 Mercedes 300D 376K (diesel commuter) |
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