Addblue

[Mikey1]

I have read the latest generation diesel will have this system fitted to reduce co2 admissions.

Does anyone know how much this stuff costs,i searched the web and found nothing on cost.They say a tank will last 10,000 miles.

 

[Mikey1]

i believe they call it urea injection

 

[seth1]

hello Mikey,further to your post,not all modern diesel engines will require it.on the commercial side ,some manufactories have used it since euro 4,were now looking at euro 6.the alternative is egr,and basically,its in place for makers who can,t get the combustion chambres of their engines clean enough,thus deal with the nox gases on the outside,as far as im aware to run with an empty addblue tank is an offence.

 

[Mikey1]

Hi Seth

Thanks for the info,any idea on cost?

 

[spj]

Hi all,

Addblue contains ammonia and is quite nasty stuff, it has been used on buses and trucks for about a year now, All HGV and bus manufacturers now use Addblue or EGR, EGR is used by Scania and maybe some others but Addblue seems more common. I beleive Audi will be using it soon and the tank will be in the boot, it will hold a few litres and be filled on service so the driver should not have to touch it. I think Addblue is about

 

[davedee]

Hi spj. Am I right in thinking that the Adblue is injected into the cat to clean the exhaust gasses as opposed to being added to the fuel. If so, a retro fit would probably be prohibitively expensive would it not.

Dave

 

[Rodone]

Hi spj. Am I right in thinking that the Adblue is injected into the cat to clean the exhaust gasses as opposed to being added to the fuel. If so, a retro fit would probably be prohibitively expensive would it not.

Dave

All of this makes me think that 1st April has come early!!

 

[spj]

Hi Dave,

yes the Adblue is injected into the exhaust system but is controlled very accurately by the engine ECU along with the fueling and everything else, a retro fit would be very complex and expensive as even the exhaust is different.

spj.

 

[Alex_374296729]

Adblue is similar idea to the 2 stroke engine, one tank for each. I drive a bus and it seems to drink the stuff. One day the bus ran out of it and everytime it changed gear you got a blast of black smoke. The buses donot do any more miles to the gallon as a result of it. Personally I think it is just another way to add fuel tax and we will find in a few years that it does damage in other ways.

 

[Mikey1]

I dont think it is to improves the mpg it just reduces nitrogen oxides although they then have to add a secondary catalytic converter which will then bring the emmission down.Hopefully it will put these cars into lower road fund brackets which will be cheaper,but will it be cheaper when you have to buy the Adblue?

 

[Angus1]

Its most unlikely that ad-blue will be needed in the forseeable future in cars.

There are already engines which can meet 2014 emmisions regs.

The ad-blue doesn`t help economy, or smooth running,it is only there for emmissions, and has been proven by Scania it isn`t the only way of meeting targets.

 

[Mikey1]

Angus

Do you think this is a short term answer to get emmissions down quickly,and work on the engines without Adblue for the future?

Mercedes have produced cars for release in 2009/10 and i think Audi are going to use a similar system.

 

[seth1]

as said the main reason for addblue is to control the Nox gases coming out of the exhaust,these are deemed "dirty".for now it is an inbetween cure for exhaust levels.

As Angus says and rightly so its very doubltful if it will get used on cars.But not all industrial makers use it or need it,ie MAN dont use it ,and dont need it.why?because they use common rail,and not unit injectors.

Cummins have now reinvented common rail with their new xpi system,4500 bar fuel pressure,injects 7 times on every firing stroke.requires no addblue and replaces the old pressure time system(unit injectors)and meets euro 6(2011)

the bottom line is addblue is required for outdated fuel systems.

 

[Mikey1]

Hi seth

I understand what you are saying,but Mercedes have produced this system for the GL and ML that will be released in the US later this year then Uk next year,are their fuel sytems outdated?

 

[seth1]

hello Mickey,

as far as im aware,mercedes have used common rail on the smaller engines since around"2000"ish.but as usual the goalposts get moved further away every year.the larger stuff uses unit injectors,but these -not to be confused with common rail,are not effiecent enough.they simply inject one large quantity,instead of lots of little ones,when required.

The move to euro 4 was made easier by reverting back to euro 2 spec engines and equiping with urea.As a bit of useless information,mercedes will by next year have stopped producing their own large capacity units and will be using detroit diesel dd15's now that Daimler have took control.

 

[spj]

Hi all,

Back to the earlier posts I checked at work last night and Adblue is 33p a litre from bulk (1000 litres) or 58p per litre for a 10 litre tub, it is supposed to use 95% diesel to 5% Adblue.

The use of Adblue as correctly stated in other posts is basicly to allow a 'dirty' engine to meet newer standards, manufacturers will always struggle to get performance, economy and emissions right and this is one way get emissions down and not badly effect fuel economy and performance.

It seems strange that one of the planets biggest poluters with petrol V8s (USA) has Cummins Diesel and Detroit Diesel to name a couple of leading engine manufacturers producing the cleanest diesel engines and the UK is taxed to death and emissions used as an excuse, I know it all counts but the UK is only a tiny part of the world.

spj

 

[rob_jax]

Slightly wrong about MB and their Euro 4 V6 diesel engines.

Mercedes introduced the E320 Bluetec (and the corresponding ML class vehicle) last year in the USA and will be introducing the E-class model in the UK later this year.

These cars are based on the new V6 CDI engine introduced for the 2006 model year - and in the E-class were initially available as a 190+ bhp E280 and a 230+ bhp E320 - same engine, same injection system - just a different engine map in the car ECU.

Both of these engines are Euro IV specification - and common rail - or Euro IV+ if fitted with a PDF

The new-to-the-UK E320 Bluetec will use a 200 bhp tuning variant of the same engine, but with the AddBlue Urea injection. This car should be Euro V compliant.

And Mercedes don't use unit injectors on the passenger vehicles - my E320 is common rail - and I don't remember any such ideas when I last visited MB in Friedrichshafen - the confusion may arise because this family of engines use the latest piezo-electric injector heads to provide highly accurate injection pulses, but they still use a common rail fuel reservoir.

Robert

 

[seth1]

As stated,

correct in saying small MB diesel units dont use unit injectors,but do use common rail.I was actually referring to the larger industrial units which i do see and these use a very crude ,the same system DAF use,s unit injection system where by the system is fitted on the exteria of the engine.the reason being there is not adaquate room within the heads.bringing us back to outdated designs.