Recent Topics
Using out of spec oil for engines?
by Timo325
03/24/17 06:02 AM
Group V lubricants
by subzerospeed
03/24/17 02:11 AM
What's the best VP Race Fuel or Mixture for a
by trod30
03/23/17 11:42 PM
What is the higher qualtiy gas in California?
by trod30
03/23/17 11:32 PM
Diesel Oil Ratings
by Kevin719
03/23/17 10:52 PM
Sib Hashian - RIP
by spasm3
03/23/17 10:36 PM
shopping for a new video card.
by earlyre
03/23/17 09:37 PM
nuke plant I worked at just hiccupped...
by ebr1190rx
03/23/17 09:10 PM
Filthy under valve cover, valve train is clean.
by mrsilv04
03/23/17 08:32 PM
2012 CBR 1000RR GN4 10w-30
by V1
03/23/17 08:29 PM
Do you trust a private seller who is a realtor?
by sifan
03/23/17 07:56 PM
FL-500S'...new and old designs...side by side
by Onug
03/23/17 07:50 PM
Havoline 5W-20 Motor Oil - 5 qt. (Pack of 3) - $30
by SirTanon
03/23/17 07:23 PM
Who to purchase from?
by Eddie
03/23/17 07:05 PM
Carquest Red (Fram) R85372 C&P, 3400 miles
by blupupher
03/23/17 06:54 PM
Yokohama Geolander A/T G015 or snow tires?
by sgc2c
03/23/17 06:39 PM
AutoCraft Gold made in Saudi Arabia?
by friendly_jacek
03/23/17 06:29 PM
How do you curb your wheels?
by y_p_w
03/23/17 05:19 PM
Red Line oil
by endeavor to persevere
03/23/17 05:10 PM
Harley Syn 3
by endeavor to persevere
03/23/17 05:08 PM
Newest Members
Skybolt, Enrike, gschabel, rdc0000, anthnson1
60943 Registered Users
Who's Online
63 registered (Astro14, Astro_Guy, aquariuscsm, 97f150, ActionJoe, 97K15004WD, 8 invisible), 1481 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
60943 Members
66 Forums
262710 Topics
4337412 Posts

Max Online: 3590 @ 01/24/17 08:07 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 Offline


Registered: 04/04/12
Posts: 6806
Loc: Miami, Florida
Why do some vehicles require this, i.e., Chevy Cruze Diesel and others do not, like the Jetta TDI? What is the main purpose?
_________________________
16 Corolla 0W20 TGMO
13 Santa Fe Sport 2.0T 5W30 PPP

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


Registered: 10/30/02
Posts: 33247
Loc: Great Lakes
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 (Edge HM 10W-40)
'15 Q5 3.0T (Edge 5W-40)

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


Registered: 08/05/02
Posts: 13462
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 Offline


Registered: 04/04/12
Posts: 6806
Loc: Miami, Florida
thanks guys
_________________________
16 Corolla 0W20 TGMO
13 Santa Fe Sport 2.0T 5W30 PPP

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



Registered: 12/14/02
Posts: 39485
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 Offline


Registered: 04/04/12
Posts: 6806
Loc: Miami, Florida
'claptrap' LOLOL...
_________________________
16 Corolla 0W20 TGMO
13 Santa Fe Sport 2.0T 5W30 PPP

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


Registered: 12/07/03
Posts: 8566
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: 260
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.
_________________________
2000 Ford Explorer XLT 4WD (4.0L OHV) - QSUD 5W-30/MC FL1A
1996 Chevrolet Impala SS - M1 0W-40/M1-201

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


Registered: 01/17/03
Posts: 2521
Loc: Coastal South Carolina
what is the cost of the urea
_________________________
Prius?
In line water heater?
Solar?
All save energy, but may not save money (complicated, no DIY, parts hard to get, parts expensive). You decide.

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


Registered: 07/10/13
Posts: 260
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.
_________________________
2000 Ford Explorer XLT 4WD (4.0L OHV) - QSUD 5W-30/MC FL1A
1996 Chevrolet Impala SS - M1 0W-40/M1-201

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


Registered: 01/04/08
Posts: 2950
Loc: Central Iowa
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.
_________________________
Freedom is not about having the choice to do what you want, but the choice to do what you ought.

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


Registered: 10/12/05
Posts: 19
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: 33247
Loc: Great Lakes
Originally Posted By: Stephen M.
The Chevy Cruze does in face have a Urea injection system.

Yuck. smile
_________________________
'02 530i (Edge HM 10W-40)
'15 Q5 3.0T (Edge 5W-40)

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


Registered: 04/04/12
Posts: 6806
Loc: Miami, Florida
Chevy advises to fill every 10k mi or so. Out of curiosity, what would happen if you failed to do so?
_________________________
16 Corolla 0W20 TGMO
13 Santa Fe Sport 2.0T 5W30 PPP

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


Registered: 10/01/10
Posts: 6260
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 >