Recent Topics
Parliament Hill attacked, soldier shot
by OVERKILL
10/22/14 10:22 AM
I'm at the dealer getting my first alignment...
by CBR.worm
10/22/14 10:02 AM
Best low priced all season that's good in the snow
by grampi
10/22/14 09:09 AM
Torque them in the AIR?
by SumpChump
10/22/14 09:09 AM
Lubricant Education-Literally
by John_Conrad
10/22/14 08:26 AM
Ford Ranger tires.
by DuckRyder
10/22/14 07:30 AM
Leaking Transmission drain plug
by Mulestang
10/22/14 06:46 AM
Calamari
by Char Baby
10/22/14 06:44 AM
The Coffee Police..
by Warstud
10/22/14 05:26 AM
Cheap No Contract phone wanted... Sick of it.
by JGmazda
10/22/14 02:52 AM
1994 Volvo 945 / Q8 T1000D Dino 10w30 @8000 Km
by miniac007
10/22/14 02:32 AM
What are your favorite detailing products?
by The Critic
10/22/14 02:27 AM
Newest Members
ArtGarcia, 12e, AnonyBliss, Rits, BMEP
51659 Registered Users
Who's Online
113 registered (901Memphis, 29662, 05LGTLtd, -SyN-, 97tbird, 6 invisible), 1705 Guests and 226 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
51659 Members
64 Forums
221051 Topics
3494049 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG

Page 1 of 4 1 2 3 4 >
Topic Options
#3262914 - 01/28/14 05:37 PM Urea injection for diesel
wemay Online   sick


Registered: 04/04/12
Posts: 2176
Loc: sun & rain, S. FL.
Why do some vehicles require this, i.e., Chevy Cruze Diesel and others do not, like the Jetta TDI? What is the main purpose?
_________________________
14 Hyundai Sonata GLS 2.4L - 0W-20 NAPA - OEM - <7500 mi
13 Hyundai Santa Fe Sp 2.0T - 5W-40 Kendall - TF2808 - <4800 mi

Top
#3262922 - 01/28/14 05:45 PM Re: Urea injection for diesel [Re: wemay]
Quattro Pete Offline


Registered: 10/30/02
Posts: 25910
Loc: Michigan
Urea is used to help meet more stringent emissions requirements. TDIs will soon utilize urea as well. Some TDI applications already use urea (Passat, Touareg).

http://en.wikipedia.org/wiki/Diesel_exhaust_fluid
_________________________
'02 530i (PU 5W-40)
'08 C300 4Matic (M1 0W-40)
'13 F700 GS (BMW HP 15W-50)

Top
#3262925 - 01/28/14 05:47 PM Re: Urea injection for diesel [Re: wemay]
PandaBear Offline


Registered: 08/05/02
Posts: 12466
Loc: Silicon Valley
Originally Posted By: wemay
Why do some vehicles require this, i.e., Chevy Cruze Diesel and others do not, like the Jetta TDI? What is the main purpose?



The main purpose is to get rid of the high NOX emission on diesel. Some cars don't require it because they run rich once in a while to provide enough HC and CO to be burnt and neutralize with the NOX. With urea you do not have to do that (and in theory can run at higher efficiency overall).
_________________________
"You keep asking questions PandaBear and you'll end up a vegetarian like my wife" - Camu Mahubah

Top
#3262931 - 01/28/14 05:50 PM Re: Urea injection for diesel [Re: wemay]
wemay Online   sick


Registered: 04/04/12
Posts: 2176
Loc: sun & rain, S. FL.
thanks guys
_________________________
14 Hyundai Sonata GLS 2.4L - 0W-20 NAPA - OEM - <7500 mi
13 Hyundai Santa Fe Sp 2.0T - 5W-40 Kendall - TF2808 - <4800 mi

Top
#3262938 - 01/28/14 05:55 PM Re: Urea injection for diesel [Re: wemay]
JHZR2 Offline



Registered: 12/14/02
Posts: 33778
Loc: New Jersey
It is a reagent in the catalytic process to get rid of NOx. In the USA, we're held hostage by California's geography and thus we can call 8 MPG SUVs "partial zero" emissions vehicles, while diesels are "gross polluters" when they return 50 MPG - and are forced to have this claptrap.

Actually Id rather have urea than not, and go another route. I think the processes to prevent NOx in diesels are worse than the aftertreatment...

Top
#3262944 - 01/28/14 05:59 PM Re: Urea injection for diesel [Re: wemay]
wemay Online   sick


Registered: 04/04/12
Posts: 2176
Loc: sun & rain, S. FL.
'claptrap' LOLOL...
_________________________
14 Hyundai Sonata GLS 2.4L - 0W-20 NAPA - OEM - <7500 mi
13 Hyundai Santa Fe Sp 2.0T - 5W-40 Kendall - TF2808 - <4800 mi

Top
#3262970 - 01/28/14 06:18 PM Re: Urea injection for diesel [Re: wemay]
Eddie Offline


Registered: 12/07/03
Posts: 6755
Loc: Florida, Cape Coral
Like the PPM [censored] when comparing a 10 mpg vehicle to a 40 mpg vehicle. Thank you auto industry lobby.
_________________________
CX5 Touring 2.5L :-)

Top
#3262971 - 01/28/14 06:18 PM Re: Urea injection for diesel [Re: wemay]
AP9 Offline


Registered: 07/10/13
Posts: 218
Loc: Chicago suburbs
Standard three-way catalytic converter doesn't really work on diesels, since they are stratified-charge engines that run very lean and therefore have too much oxygen in the exhaust.

Top
#3263117 - 01/28/14 08:13 PM Re: Urea injection for diesel [Re: wemay]
edwardh1 Offline


Registered: 01/17/03
Posts: 1645
Loc: Coastal South Carolina
what is the cost of the urea

Top
#3263123 - 01/28/14 08:17 PM Re: Urea injection for diesel [Re: edwardh1]
AP9 Offline


Registered: 07/10/13
Posts: 218
Loc: Chicago suburbs
DEF (urea in 32.5% solution with water) runs about $6/gallon in store, or under $3/gallon at truck stops with DEF pumps.

Top
#3263300 - 01/28/14 11:17 PM Re: Urea injection for diesel [Re: wemay]
TiredTrucker Offline


Registered: 01/04/08
Posts: 1007
Loc: Kellogg, IA
I would have much rather the Urea/SCR thing would have been done first instead of the EGR [censored]. I don't care for any of this stuff, but having all emissions stuff handled outside the engine is a far better way to do it than making an engine eat it's own feces. As a side note, it has been shone that they can reduce EGR because of the SCR, and this in turn allows the engine to be more efficient and in turn the DPF doesn't have to do regens as frequently. Now, if they could just do away with the EGR, things might be more tolerable.
_________________________
Hey there, VA, what do ya say? How many vets did you kill today?

Top
#3263600 - 01/29/14 09:52 AM Re: Urea injection for diesel [Re: wemay]
Stephen M. Offline


Registered: 10/12/05
Posts: 15
Loc: Vincennes, IN.
The Chevy Cruze does in face have a Urea injection system. The storage tank is located in the trunk.

Top
#3263609 - 01/29/14 10:04 AM Re: Urea injection for diesel [Re: Stephen M.]
Quattro Pete Offline


Registered: 10/30/02
Posts: 25910
Loc: Michigan
Originally Posted By: Stephen M.
The Chevy Cruze does in face have a Urea injection system.

Yuck. smile
_________________________
'02 530i (PU 5W-40)
'08 C300 4Matic (M1 0W-40)
'13 F700 GS (BMW HP 15W-50)

Top
#3263616 - 01/29/14 10:20 AM Re: Urea injection for diesel [Re: wemay]
wemay Online   sick


Registered: 04/04/12
Posts: 2176
Loc: sun & rain, S. FL.
Chevy advises to fill every 10k mi or so. Out of curiosity, what would happen if you failed to do so?
_________________________
14 Hyundai Sonata GLS 2.4L - 0W-20 NAPA - OEM - <7500 mi
13 Hyundai Santa Fe Sp 2.0T - 5W-40 Kendall - TF2808 - <4800 mi

Top
#3263676 - 01/29/14 11:07 AM Re: Urea injection for diesel [Re: wemay]
A_Harman Offline


Registered: 10/01/10
Posts: 4274
Loc: Michigan
The vehicle would go into a limp home mode until you refilled the urea container. I think if you go past a given number of miles with the urea system empty, it will refuse to start.
_________________________
1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck

Top
Page 1 of 4 1 2 3 4 >